Dr Zhaohui Wang

Dr Zhaohui Wang

Conjoint Senior Lecturer

School of Environmental and Life Sciences

Career Summary

Biography

Dr Zhaohui Wang received his PhD degree in Physical Chemistry (2009) from Institute of Chemistry, Chinese Academy of Sciences, China. He is currently a Conjoint Senior Research Fellow at International Centre for Balanced Land Use at the University of Newcastle, Australia. Prior to this Dr Wang worked as an Associate Professor at College of Environmental Science and Engineering, Donghua University, China and as a Research Associate at Southern Cross GeoScience, Southern Cross University, Australia, respectively. His career has been dedicated to fundamental discovery on environmental chemistry of redox-active elements, focusing specifically on Fe, Cl and Cr cycles both in natural and engineered systems. Dr Wang is the (co)author of over 70 peer-reviewed journal articles and 4 book chapters. To date his publications have received over 2700 citations (Google Scholar), with an H-index of 23 (i10-index of 45). He has served as an Associate Editor for RSC Advances (Royal Society of Chemistry) since 2015.


Qualifications

  • DOCTOR OF NATURAL SCIENCE Chemistry, Graduat University of Chinese Academy of Sciences

Keywords

  • Advanced oxidation processes
  • Chemical intermediates
  • Environmental catalysis
  • Environmental geochemistry
  • Environmental photochemistry
  • Environmental redox chemistry
  • Radical chemistry

Languages

  • Mandarin (Mother)
  • English (Fluent)

Professional Experience

UON Appointment

Title Organisation / Department
Senior Lecturer University of Newcastle
School of Environmental and Life Sciences
Australia

Grant Reviews

Year Grant Amount
2017 ARC FT DP DE
Aust Competitive - Commonwealth - 1CS, Aust Competitive - Commonwealth - 1CS
$1,000,000

Prestigious works / other achievements

Year Commenced Year Finished Prestigious work / other achievement Role
2015 2018 Associate Editor RSC Editor
Edit

Publications

For publications that are currently unpublished or in-press, details are shown in italics.


Chapter (2 outputs)

Year Citation Altmetrics Link
2013 Wang Z, Chen C, Ma W, Zhao J, 'Sensitization of Titania Semiconductor: A Promising Strategy to Utilize Visible Light', Photocatalysis and Water Purification: From Fundamentals to Recent Applications 199-240 (2013)
DOI 10.1002/9783527645404.ch8
Citations Scopus - 10
2011 Chen C, Wang Z, Ma W, Ji H, Zhao J, 'Photocatalytic Degradation of Organic Contaminants on Mineral Surfaces', Biophysico-Chemical Processes of Anthropogenic Organic Compounds in Environmental Systems 91-111 (2011)
DOI 10.1002/9780470944479.ch4
Citations Scopus - 2

Journal article (99 outputs)

Year Citation Altmetrics Link
2021 Dong Y, Peng W, Liu Y, Wang Z, 'Photochemical origin of reactive radicals and halogenated organic substances in natural waters: A review', Journal of Hazardous Materials, 401 (2021)

© 2020 Elsevier B.V. Halogenated organic compounds, also termed organohalogens, were initially regarded to be of almost exclusively anthropogenic origin. However, recent research ... [more]

© 2020 Elsevier B.V. Halogenated organic compounds, also termed organohalogens, were initially regarded to be of almost exclusively anthropogenic origin. However, recent research has demonstrated that photochemical reactions are important abiotic sources of organohalogen compounds in sunlit surface waters. Halide ions (X-, X represents Cl, Br and I) are common anions in natural waters and might be oxidized by reactive species originated from photochemistry of dissolved organic matter (DOM) or inorganic photoactive species. The resulting reactive halogen species may react with organic substances with diverse bimolecular reaction rate constants, depending on the complexity and structure of organic substances. Therefore, the chemical mechanism of halogenation remains challenging to be fully elucidated. To better understand the trends in the existing data and to identify the knowledge gaps that may merit further investigation, this review gives an integrative summary on the sources of reactive oxygen species (ROS) and halogen radicals (X[rad]/X2[rad]-). Photochemical halogenation of phenolic compounds and formation of methyl halide and brominated organic pollutants are highlighted. By evaluating existing literature and identifying some uncertainties, this review emphasizes the environmental significance of sunlight-driven halogenation and proposes further research directions on mechanistic investigation and rational experimental design close to natural systems.

DOI 10.1016/j.jhazmat.2020.123884
2021 Yang F, Sheng B, Wang Z, Xue Y, Liu J, Ma T, et al., 'Performance of UV/acetylacetone process for saline dye wastewater treatment: Kinetics and mechanism', Journal of Hazardous Materials, 406 (2021)

© 2020 Elsevier B.V. Futility of traditional advanced oxidation processes (AOPs) in saline wastewater treatment has stimulated the quest for novel ¿halotolerant¿ chemical oxidatio... [more]

© 2020 Elsevier B.V. Futility of traditional advanced oxidation processes (AOPs) in saline wastewater treatment has stimulated the quest for novel ¿halotolerant¿ chemical oxidation technology. Acetylacetone (AA) has proven to be a potent photo-activator in the degradation of dyes, but the applicability of UV/AA for saline wastewater treatment needs to be verified. In this study, degradation of crystal violet (CV) was investigated in the UV/AA system in the presence of various concentrations of exogenic Cl- or Br-. The results reveal that degradation, mineralization and even accumulation of adsorbable organic halides (AOX) were not significantly affected by the addition of Cl- or Br-. Rates of CV degradation were enhanced by elevating either AA dosage or solution acidity. An apparent kinetic rate equation was developed as r = -d[CV]/dt = k[CV]a[AA]b = (7.34 × 10-4 mM1-(a+b) min-1) × [CV]a=0.16 [AA]b=0.97. In terms of results of radical quenching experiments, direct electron/energy transfer is considered as the major reaction mechanism, while either singlet oxygen or triplet state (3(AA)*) might be involved. Based on identification of degradation byproducts, a possible degradation pathway of CV in the UV/AA system is proposed.

DOI 10.1016/j.jhazmat.2020.124774
2020 Yuan R, Jiang M, Gao S, Wang Z, Wang H, Boczkaj G, et al., '3D mesoporous -Co(OH)

© 2019 Elsevier B.V. Cobalt-based catalysts with high stability and facile recovery for heterogeneous peroxymonosulfate (PMS) activation are still rather sparse and therefore high... [more]

© 2019 Elsevier B.V. Cobalt-based catalysts with high stability and facile recovery for heterogeneous peroxymonosulfate (PMS) activation are still rather sparse and therefore highly desirable. Herein, 3D mesoporous a-Co(OH)2 nanosheets was created on robust nickel foam (NF) via facile electrodeposition approach at 6 mA/cm2 for only 400 s. Almost complete removal of phenol can be achieved within 7 min with a degradation rate of 0.39 min-1, 2 times higher than that with ever-prevalent Co3O4 derived from direct calcination of a-Co(OH)2/NF. This can be attributed to the hydrotalcite-like hexagonal structure of a-Co(OH)2 with large interlayer spacing for enhancing the catalytic performance. The low activation energy of Co(OH)2/NF (53.8 kJ/mol) indicates its lower reaction energy barrier for PMS activation. Moreover, the influences of electrodeposition parameters (i.e. current density, deposition time), PMS dosage, initial pH and coexisting anions (HCO3-, SO42-, Cl-) on the phenol degradation were systematically evaluated. The recycling tests revealed the prominent stability of Co(OH)2/NF. The quenching tests verified that SO4[rad]- radicals acted as the predominant reactive species for phenol decomposition. The possible reaction mechanisms were proposed based on the intermediates identification. The findings of this work suggest the great potentials of the 3D macroscopic Co(OH)2/NF in water purification, and open up new avenues for scalable preparing recyclable heterogeneous catalysts.

DOI 10.1016/j.cej.2019.122447
Citations Scopus - 37
2020 Liu T, Pei K, Wang Z, Wang ZL, 'Pivotal effects of external Fe

© 2020 Elsevier Inc. Persulfate could be activated by zero-valent iron (ZVI) leading to the rapid removal of various contaminants. However, quick consumption of Fe2+ largely const... [more]

© 2020 Elsevier Inc. Persulfate could be activated by zero-valent iron (ZVI) leading to the rapid removal of various contaminants. However, quick consumption of Fe2+ largely constrained the removal (%) of target pollutants. Here it was reported that Na2S2O8 (SP) combined with ZVI, as an external source of Fe2+, was activated by Fe2+ to quickly (minutes scale) and efficiently (more than 90%) remove As (III) from aqueous solution at an initial pH value from 1.0 to 9.0. As (III) removal was obviously improved by an increase of Fe2+ rather than Na2S2O8 dosage. The removal of As (III) using Fe2+-SP-ZVI system followed the pseudo-second-order kinetic and pseudo-first-order kinetic expression. Fe2+ from ZVI oxidization could improve the efficient generation of [Formula presented], which obviously boosted ZVI corrosion. The production of [Formula presented] could be manipulated by oxalic acid, ethylenediaminetetraacetic acid (EDTA), citric acid and phosphates through controlling the concentration of dissociative Fe2+, leading to an obvious repression on As (III) removal. The fitting of X-ray absorption fine structure (XAFS) spectra illustrated that the interatomic distance of As¿O shell was located between As(III)¿O and As(V)¿O shell and external Fe2+ could promote the oxidation of As (III) to As (V) from 35.6% in 1.0 min¿44.5% in 10.0 min. Goethite as the main component of iron oxyhydroxides might play a significant role of As (III) adsorption in Fe2+-SP-ZVI system. These findings are crucial for knowing the fate and transport of arsenic under permeable reactive barriers.

DOI 10.1016/j.envres.2020.109922
2020 Yang X, Cai J, Wang X, Li Y, Wu Z, Wu WD, et al., 'A Bimetallic Fe-Mn Oxide-Activated Oxone for in Situ Chemical Oxidation (ISCO) of Trichloroethylene in Groundwater: Efficiency, Sustained Activity, and Mechanism Investigation', Environmental Science and Technology, 54 3714-3724 (2020)

© 2020 American Chemical Society. Bimetallic Fe-Mn oxide (BFMO) has been regarded as a promising activator of peroxysulfate (PS), the sustained activity and durability of BFMO for... [more]

© 2020 American Chemical Society. Bimetallic Fe-Mn oxide (BFMO) has been regarded as a promising activator of peroxysulfate (PS), the sustained activity and durability of BFMO for long-term activation of PS in situ, however, is unclear for groundwater remediation. A BFMO (i.e., Mn1.5FeO6.35) was prepared and explored for PS-based in situ chemical oxidation (ISCO) of trichloroethylene (TCE) in sand columns with simulated/actual groundwater (SGW/AGW). The sustained activity of BFMO, oxidant utilization efficiency, and postreaction characterization were particularly investigated. Electron spin resonance (ESR) and radical scavenging tests implied that sulfate radicals (SO4â¢-) and hydroxyl radicals (HOâ¢) played major roles in degrading TCE, whereas singlet oxygen (1O2) contributed less to TCE degradation by BFMO-activated Oxone. Fast degradation and almost complete dechlorination of TCE in AGW were obtained, with reaction stoichiometry efficiencies (RSE) of Î"TCE/Î"Oxone at 3-5%, much higher than those reported RSE values in H2O2-based ISCO (=0.28%). HCO3- did not show detrimental effect on TCE degradation, and effects of natural organic matters (NOM) were negligible at high Oxone dosage. Postreaction characterizations displayed that the BFMO was remarkably stable with sustained activity for Oxone activation after 115 days of continuous-flow test, which therefore can be promising catalyst for Oxone-based ISCO for TCE-contaminated groundwater remediation.

DOI 10.1021/acs.est.0c00151
Citations Scopus - 4
2020 Yuan R, Jiang Z, Wang Z, Gao S, Liu Z, Li M, Boczkaj G, 'Hierarchical MnO

© 2020 Elsevier Inc. In this work, birnessite-type d-MnO2 nanoflowers were uniformly deposited on 3D nickel foam (NF) by one-step hydrothermal route for high-efficient activation ... [more]

© 2020 Elsevier Inc. In this work, birnessite-type d-MnO2 nanoflowers were uniformly deposited on 3D nickel foam (NF) by one-step hydrothermal route for high-efficient activation of peroxymonosulfate (PMS) towards degradation of acid orange 7 (AO7). High specific surface area, large pore volume and 3D hierarchical structure promotes the mass and electron transfer for great catalytic activity. Low reaction energy barrier (Ea = 27.5 kJ/mol) and outstanding reusability with extremely low manganese leaching during recycling (<0.06 mg/L) was achieved due to the 3D hierarchical structure which could effectively avoid the agglomeration of nano-sized MnO2. SO4[rad]- was confirmed to be the predominant reactive species for AO7 decomposition by electron spin resonance and quenching tests. The synergistic catalytic mechanism of MnO2/NF and the role of inner-sphere complexation between the active sites of MnO2 and peroxymonosulfate were thoroughly investigated. Compared with traditional nano/micro-sized catalysts, 3D macroscopic MnO2/NF with facile recovery and high stability potentially facilitates fascinating applications as green heterogeneous catalysis approach.

DOI 10.1016/j.jcis.2020.03.041
Citations Scopus - 15
2020 Wang Z, Wang X, Yuan R, Xiao D, 'Resolving the kinetic and intrinsic constraints of heat-activated peroxydisulfate oxidation of iopromide in aqueous solution', Journal of Hazardous Materials, 384 (2020)

© 2019 Elsevier B.V. Iopromide (IOP) has been identified as one of the most persistent pharmaceuticals in wastewater treatment processes, however, kinetic and intrinsic factors co... [more]

© 2019 Elsevier B.V. Iopromide (IOP) has been identified as one of the most persistent pharmaceuticals in wastewater treatment processes, however, kinetic and intrinsic factors constraining its fast removal in advanced oxidation processes (AOPs) are yet to be resolved. Here oxidation of IOP by heat-activated peroxydisulfate (PDS) was investigated both experimentally and theoretically. Rates of IOP degradation were enhanced by elevating solution temperature and acidity. An apparent kinetic rate equation was developed, based on the pseudo-first-order reaction model and assumption of steady state of SO4[rad]-. The common water constituents showed inhibitory effects on IOP decomposition to various extent. An insufficient supply of SO4[rad]- was considered as the major kinetic constraint. Eight byproducts were identified and most of which had intact triiodinated benzene ring. O-demethylation, oxidation of amino moiety and oxidation/elimination of alcohol groups are proposed as the primary degradation pathways, in accordance with the incomplete mineralization and non-detectable release of inorganic iodine. Quantum chemical calculations predict that oxidation of alkyl chains of IOP preferentially occurs and IOP byproducts with shorter side chains and intact triiodinated ring are more reactive than IOP. By virtue of the identified kinetic and intrinsic constraints, strategies to maximize degradation efficiency of IOP are proposed.

DOI 10.1016/j.jhazmat.2019.121281
Citations Scopus - 2
2020 Sheng B, Zhou X, Shi Z, Wang Z, Guo Y, Lou X, Liu J, 'Is addition of reductive metals (Mo, W) a panacea for accelerating transition metals-mediated peroxymonosulfate activation?', Journal of Hazardous Materials, 386 (2020)

© 2019 Elsevier B.V. The interaction of reductive metal ions and peroxymonosulfate (PMS) is necessary for the generation of sulfate radials (SO4[rad]-), however, this process is g... [more]

© 2019 Elsevier B.V. The interaction of reductive metal ions and peroxymonosulfate (PMS) is necessary for the generation of sulfate radials (SO4[rad]-), however, this process is greatly restrained by the sluggish reduction of high-valent metal ions. Here we report that commercially available reductive metal (Mo or W) powders are capable of unlocking this kinetic constraint. The reduction of Fe(III) to Fe(II), decomposition of PMS, and degradation/mineralization of 4-chlorophenol (4-CP) are all accelerated in the Mo/Fe2+/PMS process at a very low Fe2+/PMS ratio (Fe2+/PMS = 1/10). In such an accelerated system, common adverse effects of natural water constituents such as chloride and humic acid are largely mitigated. According to the fluorescence measurement and scavenging tests, sulfate and hydroxyl radicals dominate in Mo/Fe2+/PMS process. The addition of Mo or W is further confirmed to favor Cu2+/PMS process, but this is not the case for other metal ions (Mn2+, Ni2+, Ce3+ and Co2+). Reductive zero-valence and four-valence active sites (Mo0 and Mo4+; W0 and W4+) play key roles in overall redox reaction. Overall, our present work provides an alternative route for expediting redox cycling of transition metals in advanced oxidation processes, without useless consumption of PMS and increase of total organic carbon.

DOI 10.1016/j.jhazmat.2019.121877
Citations Scopus - 6
2020 Guo Y, Zhao YL, Lou X, Zhou T, Wang Z, Fang C, et al., 'Efficient degradation of industrial pollutants with sulfur (IV) mediated by LiCoO

© 2020 Elsevier B.V. Strategies to maximize the reuse of electronic and industrial wastes have scientific, economic, social and environmental implications. We herein propose a str... [more]

© 2020 Elsevier B.V. Strategies to maximize the reuse of electronic and industrial wastes have scientific, economic, social and environmental implications. We herein propose a strategy of ¿treating waste with waste¿ using LiCoO2 cathode powders from spent lithium ion batteries to eliminate industrial pollutants led by sulfur (S) (IV) in waste water. By radical scavenging experiments and electron spin resonance (ESR) analysis, we identified singlet 1O2 as the dominant species while SO4[rad]- and [rad]OH as the secondary species for decontamination during the oxidization process mediated by LiCoO2 powders. The intrinsic mechanism of S(IV) conversion was revealed to be two-step hydrogen migrations from HSO3- to O2 occurring on LiCoO2 surface by density functional theory (DFT) calculations. The surface of LiCoO2 powders plays a key role in anchoring sulfur species and forming surface complex as an excellent medium, which is found to be stable and reusable by material characterizations and the recycling experiment. Free Co(II) ions in solvents have no catalysis effect on the conversion of pollutants. Our work offers a particularly vivid example for rational reuse of electronic wastes to eliminate industrial pollutants, and may raise economic benefits in environmental practice due to two aims achieved in once action.

DOI 10.1016/j.jhazmat.2020.123090
Citations Scopus - 1
2020 Wang L, Lan X, Peng W, Wang Z, 'Uncertainty and misinterpretation over identification, quantification and transformation of reactive species generated in catalytic oxidation processes: A review', Journal of Hazardous Materials, (2020)

© 2020 Elsevier B.V. The identification of reactive radical species using quenching and electron paramagnetic resonance (EPR) tests has attracted extensive attention, but some mis... [more]

© 2020 Elsevier B.V. The identification of reactive radical species using quenching and electron paramagnetic resonance (EPR) tests has attracted extensive attention, but some mistakes or misinterpretations are often present in recent literature. This review aims to clarify the corresponding issues through surveying literature, including the uncertainty about the identity of radicals in the bulk solution or adsorbed on the catalyst surface in quenching tests, selection of proper scavengers, data explanation for incomplete inhibition, the inconsistent results between quenching and EPR tests (e.g., SO4¿- is predominant in quenching test while the signal of ¿OH predominates in EPR test), and the incorrect identification of EPR signals (e.g., SO4¿- is identified by indiscernible or incorrect signals). In addition, this review outlines the transformation of radicals for better tracing the origin of radicals. It is anticipated that this review can help in avoiding mistakes while investigating catalytic oxidative mechanism with quenching and EPR tests.

DOI 10.1016/j.jhazmat.2020.124436
Citations Scopus - 2
2020 Zaeni JRJ, Lim JW, Wang Z, Ding D, Chua YS, Ng SL, Oh WD, 'In situ nitrogen functionalization of biochar via one-pot synthesis for catalytic peroxymonosulfate activation: Characteristics and performance studies', Separation and Purification Technology, 241 (2020)

© 2020 Elsevier B.V. A facile and scalable one-pot synthesis method was designed to fabricate N-doped biochar from wood residue for peroxymonosulfate (PMS) activation. The urea:wo... [more]

© 2020 Elsevier B.V. A facile and scalable one-pot synthesis method was designed to fabricate N-doped biochar from wood residue for peroxymonosulfate (PMS) activation. The urea:wood residue w/w ratio was varied from 0:1 to 100:1, and the intrinsic (surface chemistry) and extrinsic (morphology, specific surface area, etc.) properties of the N-doped biochar were systematically investigated. Notably, the urea:wood residue w/w ratio played a significant role in tuning the N species composition in the N-doped biochar. A higher urea:wood residue w/w ratio resulted in greater at.% of graphitic N and higher specific surface area. The results show that the catalyst prepared with urea:wood residue w/w ratio of 100:1 (NC800-20) manifested the greatest catalytic activity as PMS activator for organics removal due to its highly favorable combination of intrinsic (highest at.% graphitic N) and extrinsic (excellent specific surface area) properties. The catalyst loading, PMS dosage and pH were found to be operationally crucial for PMS activation. Under the best condition, the NC800-20 can be used to degrade various organic pollutants. The recyclability of NC800-20 was studied and while the catalytic activity gradually deteriorated over successive cycles, it can be completely restored by simple calcination at 500 °C. The used catalyst was extensively characterized, revealing insights into the mechanism of PMS activation. The prevailing mechanism for PMS activation was the nonradical pathway. Overall, this research provides insights into preparing N-doped biochar with favorable extrinsic and intrinsic properties from biowaste for sustainable pollutant removal via PMS activation.

DOI 10.1016/j.seppur.2020.116702
Citations Scopus - 7
2020 Fernandes A, Makos P, Wang Z, Boczkaj G, 'Synergistic effect of TiO

© 2019 The Authors Different types of photolytic and photocatalytic advanced oxidation processes (AOPs) were used for treatment of refinery effluents from bitumen production. The ... [more]

© 2019 The Authors Different types of photolytic and photocatalytic advanced oxidation processes (AOPs) were used for treatment of refinery effluents from bitumen production. The treatment efficiency was evaluated by analyzing chemical oxygen demand (COD), biological oxygen demand (BOD5), volatile organic compounds (VOCs) and sulfide ions concentration. The studies revealed a synergistic effect of application of external oxidants (O3, H2O2, O3/H2O2) with TiO2 and UV applied for improved COD and BOD5 reduction as well as the degradation of the VOCs present in the effluents. Among studied processes a photocatalytic process combined with peroxone (TiO2/UV/O3/H2O2) was the optimal and the most economical technology. It allows to reduce 38 and 32% of COD and BOD5 respectively and degrade 84% of total VOCs in 280 min of treatment. At this conditions the reduced COD exceeds over 30% a theoretical value based on the dose of oxidants, which proves the importance of photocatalysis in the developed technology. The sulfide ions were completely depleted in all experiments in the first 30 min of treatment. The addition of TiO2 in the AOPs technology revealed a decrease in the process cost using less amount of chemicals achieving similar treatment efficiency when comparing with photolytic and non-catalytic technologies. The application of these technologies can be conducted in two alternative scenarios; whether to deplete the sulfides ions concentration or to maximize the treatment efficiency. In both options, the technologies studied are promising as a pre-treatment before other types of AOPs effective at neutral/acidic pH values or before a biological treatment stage. Further studies should be developed, by scaling up the process to a pilot scale in a real case scenario to check the possibility of its implementation in the industrial practice.

DOI 10.1016/j.cej.2019.123488
Citations Scopus - 21
2020 Peng W, Dong Y, Fu Y, Wang L, Li Q, Liu Y, et al., 'Non-radical reactions in persulfate-based homogeneous degradation processes: A review', Chemical Engineering Journal, (2020)

© 2020 Elsevier B.V. Recently there is vigorous growth of reports on persulfate (PS)-based advanced oxidation processes (AOPs), inclining to development of newfangled catalysts an... [more]

© 2020 Elsevier B.V. Recently there is vigorous growth of reports on persulfate (PS)-based advanced oxidation processes (AOPs), inclining to development of newfangled catalysts and treatment of a wide range of organic pollutants. PS-related non-radical oxidation pathways are lately proposed, whereas there still exist debatable observations and explanation on these issues. While non-radical reactions in heterogeneous systems have been well commented, this review focuses on the latest discovery of non-radical oxidation in homogeneous persulfate (especially peroxymonosulfate (PMS)) systems. The application of direct oxidation process is firstly summarized and the roles of PMS distal oxygen in attack on organic pollutants like antibiotics are highlighted. Besides, the effects of exogenic and endogenic halogen on the reactivity and mechanisms of HOX in PS activation are discussed. Then the formation and reaction pathways of singlet oxygen (1O2) triggered by phenol/carbonyl compounds and nucleophiles are elaborated. Recent discovery on formation of high valent metal species by PS activation and their reactivity is reviewed lastly. By sorting out a large number of cutting-edge research reports, this review conducts a detailed and critical analysis and overview on the homogeneous PS non-radical mechanisms, and points out the controversies and challenges so as to better understand the reaction mechanism and further improve their treatment performance.

DOI 10.1016/j.cej.2020.127818
2020 Sheng B, Yang F, Huang Y, Wang Z, Yuan R, Guo Y, et al., 'Transformation of endogenic and exogenic Cl/Br in peroxymonosulfate-based processes: The importance of position of Cl/Br attached to the phenolic ring', CHEMICAL ENGINEERING JOURNAL, 381 (2020)
DOI 10.1016/j.cej.2019.122634
Citations Scopus - 6Web of Science - 2
2019 Yuan R, Liu J, Li Z, Chen Y, Wang Z, Liu Z, et al., 'Ultrahigh-flux (>190,000 L·m

© 2019 Elsevier Inc. Single-stage oil/water separation membranes usually suffer from weak chemical stability, susceptible mechanical damage and relatively low permeating flux, and... [more]

© 2019 Elsevier Inc. Single-stage oil/water separation membranes usually suffer from weak chemical stability, susceptible mechanical damage and relatively low permeating flux, and the sophisticated preparation processes also limit their massive utilization. In this work, Cu(OH)2 nanoneedles coated copper mesh (CM) is prepared by simple and eco-friendly anodic oxidation at a current density of 4 mA/cm2 for 6 min, which is the most efficient route reported so far. The mesh exhibits outstanding superhydrophilicity and underwater superoleophobicity towards various oils with contact angles up to 164.9°, achieving superior oil/water separation efficiency of above 99.5% and ultrahigh permeating flux of 191 160 L·m-2h-1 solely driven by gravity. Impressively, the Cu(OH)2/CM demonstrates excellent chemical stability and anti-fouling performance when exposed to acidic and strongly alkaline solutions, saturated NaCl solution and various organic solvents. High durability to withstand mechanical challenges, e.g. high-power sonication and sand abrasion, is experimentally confirmed owing to strong cohesional strength of Cu(OH)2 nanoneedles on CM surface. Importantly, the Cu(OH)2/CM exhibits favorable long-term recyclability with stable microstructure morphologies even after 50 cycles. These distinct advantages endow the Cu(OH)2/CM to be an ideal candidate to efficiently separate oil pollutants from water. The oil/water separation mechanisms are proposed based on the concept of intrusion pressure.

DOI 10.1016/j.jcis.2019.08.011
Citations Scopus - 4
2019 Li S, Hu S, Jiang W, Zhang J, Xu K, Wang Z, 'In situ construction of WO

© 2019 Elsevier Inc. Visible-light-driven (VLD) heterojunction photocatalysts for refractory contaminant degradation have aroused huge interest because of their outstanding photoc... [more]

© 2019 Elsevier Inc. Visible-light-driven (VLD) heterojunction photocatalysts for refractory contaminant degradation have aroused huge interest because of their outstanding photocatalytic performance. From the aspect of practical application, it is important to develop a highly efficient, durable, eco-friendly and inexpensive VLD photocatalyst. Herein, we report a novel VLD WO3/Bi2MoO6 heterojunction photocatalyst with remarkable photocatalytic activity, which was fabricated via an electrospinning¿calcination¿solvothermal route. The phase, composition, morphologies, and optical properties of WO3/Bi2MoO6 heterojunctions were comprehensively characterized. The photocatalytic performance of WO3/Bi2MoO6 heterojunctions was assessed by the removal of rhodamine (RhB) and tetracycline hydrochloride (TC) under visible light (VL). WO3/Bi2MoO6 heterojunctions displayed superior photocatalytic activities compared to Bi2MoO6, WO3, or the mechanical mixture of WO3 and Bi2MoO6. In particular, the heterojunction material (0.4WB, theoretical molar ratio of WO3/Bi2MoO6 is 0.4/1.0) exhibited the best degradation efficiency (100%) and mineralization rate (52.3%) in 90 min, both of which exceeded the observed rates for Bi2MoO6 by 5.3 and 6.4 times, respectively. Moreover, 0.4WB showed a good durability in eight runs. The optimized photocatalytic property of WO3/Bi2MoO6 can be attributed to enhanced VL absorption and reduced recombination efficiency of carriers owing to the synergistic effects between Bi2MoO6 and WO3. The necessity of direct contact between WO3/Bi2MoO6 and contaminants was experimentally verified. The study on photocatalytic mechanism demonstrates that superoxide free radicals (O2[rad]-) and photo-generated hole (h+) are dominantly responsible for the pollutant degradation, as demonstrated by the trapping experiments and electron spin resonance (ESR) analysis. Therefore, the WO3/Bi2MoO6 heterojunction holds huge potential to be utilized as a durable and highly active photocatalyst for wastewater treatment.

DOI 10.1016/j.jcis.2019.08.077
Citations Scopus - 55
2019 Huang Y, Sheng B, Yang F, Wang Z, Tang Y, Liu Q, et al., 'Chlorine incorporation into dye degradation by-product (coumarin)in UV/peroxymonosulfate process: A negative case of end-of-pipe treatment', Chemosphere, 229 374-382 (2019)

© 2019 Elsevier Ltd Recently, UV/peroxymonosulfate (PMS)seems as a panacea for the treatment of recalcitrant organic pollutants; however, the presence of high concentration of chl... [more]

© 2019 Elsevier Ltd Recently, UV/peroxymonosulfate (PMS)seems as a panacea for the treatment of recalcitrant organic pollutants; however, the presence of high concentration of chloride in saline wastewater indeed complicates this end-of-pipe technology. Here a negative case of UV/PMS for the treatment of one of secondary degradation byproducts of dyes (coumarin, COU)is demonstrated. The removal rate of COU is reduced by addition of Cl- (0¿10 mM). Further increase in Cl- content favors a rapid COU degradation, whereas Cl- involvement seems to open a ¿Pandora's box¿: 1)a variety of chlorinated organic intermediates such as 4-chloroisocoumarin and 5-chloro-2-hydroxy-benzaldehyde are identified; 2)Accumulation and relative increase of absorbable organic halogen (AOX)with reaction time in the presence of high levels of chloride are observed; 3)the acute toxicity of the treated COU solution increases; 4)mineralization rate of COU decreases with the increasing [Cl-]. The fluorescence intensity in the UV/PMS/COU system declines with the addition of Cl-, implying the scavenging effects of chloride on hydroxyl radicals. The possible reaction pathways of COU are discussed. These findings highlight the imperativeness of minimizing auxiliary salt dosages in dyeing processes (i.e., source reduction)and developing new end-of-pipe technologies that can work in a saline environment.

DOI 10.1016/j.chemosphere.2019.05.024
Citations Scopus - 13
2019 Yang F, Sheng B, Wang Z, Yuan R, Xue Y, Wang X, et al., 'An often-overestimated adverse effect of halides in heat/persulfate-based degradation of wastewater contaminants', Environment International, 130 (2019)

© 2019 The Authors Halides (X-) in the industrial wastewater are usually thought to adversely affect the degradation kinetics and mineralization rates in several SO4[rad]--based a... [more]

© 2019 The Authors Halides (X-) in the industrial wastewater are usually thought to adversely affect the degradation kinetics and mineralization rates in several SO4[rad]--based advanced oxidation processes. However, their unfavorable effects might be overestimated, particularly the heat/persulfate (PS) system as tested in the present study. Here the degradation of phenol, benzoic acid, coumarin and acid orange 7 (AO7) was examined with the presence of chloride or bromide in a heat/PS process. Cl- was found to have a dual effect (inhibition followed by enhancement) on the decomposition rates of organic pollutants, whereas the effects of Br- are insignificant within the tested concentration (0¿0.2 mM). However, some chlorinated or brominated compounds were still identified in this heat/PS system. Unexpectedly, the mineralization rates of AO7, phenol, benzoic acid and coumarin were not apparently inhibited. In addition, the formation of adsorbable organic halogen (AOX) in the heat/PS system was much less than those in the peroxymonosulfate (PMS)/Cl- or PMS/Br- systems. According to the results of kinetic modeling, SO4[rad]- was the dominating radical for AO7 degradation without Cl- or Br-, but Cl2[rad]- was the main oxidant in the presence of Cl-, SO4[rad]-, Br[rad] and Br2-[rad] were responsible for the oxidation of AO7 in the presence of Br-. The present study assumes that X2/HOX, rather than halogen radicals, is responsible for the enhanced formation of organohalogens. These findings are meaningful to evaluate the PS-based technologies for the high-salinity wastewater and to develop useful strategies for mitigating the negative effects of halides in advanced oxidation processes (AOPs).

DOI 10.1016/j.envint.2019.104918
Citations Scopus - 10
2019 Wang L, Zhu Y, Yang D, Zhao L, Ding H, Wang Z, 'The mixed marriage of copper and carbon ring-g-C

© 2019 Elsevier B.V. Effective photogenerated charge separation and rapid Cu(II)/Cu(I) redox cycling is still challenging for photocatalytic reactions and copper-based Fenton-like... [more]

© 2019 Elsevier B.V. Effective photogenerated charge separation and rapid Cu(II)/Cu(I) redox cycling is still challenging for photocatalytic reactions and copper-based Fenton-like process, respectively. Herein, a novel heterogeneous Fenton-like catalyst of copper incorporated carbon ring-g-C3N4 (Cu-C-CN) was prepared through a facile calcination method. The carbon ring could be intimately connected with g-C3N4 via sp2-hybridized C¿N bonds to form an in-plane p-conjugated structure. The carbon ring spliced g-C3N4 (C-CN) can serve as an effective electron-hole separator owing to the varied electron affinity of two domains (e.g. carbon-ring and g-C3N4). The copper species were further introduced to the framework of g-C3N4 via the Cu¿N bonds to act as acceptors of conduction-electrons from g-C3N4 and H2O2 activators. Taking the photodegradation of methylene blue (MB) as a model reaction, the decomposition efficiency over Cu-C-CN is 5.5 times higher than that of pristine g-C3N4, and would nearly linearly increase with pH. The notable enhancement in photodegradation efficiency could be ascribed to the synergetic collaboration between photocatalysis process and Fenton-like process to generate abundant [rad]OH and e-. The Cu-C-CN catalyst shows high recycling stability with negligible Cu leaching due to the strong affinity of Cu2+ to g-C3N4 framework. The strategy of coupling Fenton-like catalysts, electron-deficient domains (e.g. carbon-ring) into semiconductor-based photocatalysis provides a facile and promising solution to the remediation of water pollution with solar energy.

DOI 10.1016/j.apsusc.2019.05.288
Citations Scopus - 6
2019 Sheng B, Yang F, Wang Y, Wang Z, Li Q, Guo Y, et al., 'Pivotal roles of MoS

© 2019 Elsevier B.V. Despite the success of Fe(II)/peroxymonsulfate (PMS) process in detoxifying organic pollutants, its intrinsic drawback of sluggish Fe(III) conversion to Fe(II... [more]

© 2019 Elsevier B.V. Despite the success of Fe(II)/peroxymonsulfate (PMS) process in detoxifying organic pollutants, its intrinsic drawback of sluggish Fe(III) conversion to Fe(II) limits its large-scale practical application. Here we report that commercial MoS2, a common metal sulfide, can be used to unlock this kinetic constrain. Addition of MoS2 greatly accelerates the reduction of Fe(III) to Fe(II), decomposition of PMS, and thus results in enhanced degradation efficiency of 2,4,6-trichlorophenol (TCP) (>95%) and other biorefractory halogenated organic compounds within 30 min. Mass spectroscopy data indicate that TCP can be destructed into low-molecular-weight organic acids, manifesting its powerful oxidation capacity of MoS2-assisted Fe(II)/PMS process. Once the Fe(III) in aqueous solution is stabilized by its organic or inorganic ligands, the boosting effects of MoS2 are largely inhibited and less than 80% of TCP is degraded. Sulfate radicals and hydroxyl radicals are identified as the dominant reactive oxidants in the MoS2/Fe(II)/PMS process by radical scavenging tests. The unsaturated S on the fresh MoS2 surface and the exposed Mo(IV) sites are supposed to react with PMS and Fe(III) in the aqueous solution, respectively. No iron oxides and Mo oxides are detected in X-ray photoelectron spectroscopy (XPS) and X-ray powder diffraction (XRD) measurement, indicating the accelerated Fe(II)/PMS process mainly occurs in the homogeneous solution. MoS2 exhibits excellent recyclability and sustainable reactivity for the degradation of TCP after 5 consecutive runs. Overall, the present study provides a novel strategy to overcome the rate-limiting step of Fe(III)/Fe(II) that is commonly challenging Fe-based advanced oxidation processes (AOPs) and enable Fe(II)/PMS as efficient as typical Co(II)/PMS.

DOI 10.1016/j.cej.2019.121989
Citations Scopus - 36
2019 Wang Z, Liu Q, Yang F, Huang Y, Xue Y, Yuan R, et al., 'Accelerated oxidation of 2,4,6-trichlorophenol in Cu(II)/H

© 2019 The Authors The roles of chloride in enhanced oxidative degradation of refractory organic pollutants are recently identified in the Cu(II)/H2O2/Cl- system, but the identity... [more]

© 2019 The Authors The roles of chloride in enhanced oxidative degradation of refractory organic pollutants are recently identified in the Cu(II)/H2O2/Cl- system, but the identity of the reactive oxidants and potential conversion of inorganic chloride to organochlorine in such oxidizing environment remain obscure. Here we report that Cu(II)/H2O2/Cl- system is a unique ¿halotolerant¿ Fenton-like process that works most efficiently in saline water among the five tested redox-active metals ions (i.e. Cr(VI), Ce(III), Co(II), Mn(II) and Cu(II)). The observed pseudo first-order rate constant for 2,4,6-trichlorophenol (TCP) degradation was linearly correlated with the elevated Cl- content. The TCP degradation rate at [Cl-]0 = 1000 mM by the Cu(II)/H2O2 system was approximately 46-fold higher than that at [Cl-]0 = 5 mM. The optimal mineralization rate of TCP and percentage of absorbable organic halogens (AOX) decrease were 31.6% and 63.8%, respectively, in the tested Cu(II)/H2O2/Cl- system. However, the detection of fused chlorinated byproducts (i.e. chloro-anthracene-pentaol, dioxine, chlorinated dibenzofuran) reminds us of cautiousness in evaluating the applicability of Cu(II)-catalyzed Fenton-like reaction, particularly while it is to be applied to the treatment of wastewater contaminated with chlorophenols. Two independent models (i.e. ¿Cu(III) model¿ and ¿[rad]OH model¿) were developed to describe the kinetics of Cu(II)/H2O2/Cl- system. The failure of ¿[rad]OH model¿ to rationalize the observed AOX decay has disproved the ¿[rad]OH model¿ through reductio ad absurdum. The ability of ¿Cu(III) model¿ to adequately explain the experimental data demonstrates that Cu(III)-chloro complexes, rather than [rad]OH, is the major product resulting from reactions between Cu(I)-chloro complexes and H2O2 at neutral pH.

DOI 10.1016/j.envint.2019.105128
Citations Scopus - 6
2019 Wang X, Wang Z, Liu J, 'Degradation of sodium diatrizoate by thermally activated persulfate oxidation process', Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae, 39 1519-1526 (2019)

© 2019, Science Press. All right reserved. Thermally activated persulfate oxidation process was applied to degrade sodium diatrizoate in the aqueous solution. The impact factors, ... [more]

© 2019, Science Press. All right reserved. Thermally activated persulfate oxidation process was applied to degrade sodium diatrizoate in the aqueous solution. The impact factors, such as temperature, the initial concentrations of K2S2O8 and substrate, the initial solution pH and water matrix were investigated. The results show that diatrizoate degradation by thermally activated persulfate oxidation was fitted well with pseudo-first-order mode and Arrhenius equation. The apparent activation energy for this reaction was estimated as 105.57 kJ¿mol-1. Increasing initial persulfate concentration or temperature and reducing initial substrate concentration significantly increased the apparent rate constant (k) of diatrizoate degradation (k=0.0062×[K2S2O8]0, R2=0.98, [K2S2O8]0=2~8 mmol¿L-1; lnk=-12698×1/T+34.91, R2=0.98, T=325~345 K; k=-1.54×[diatrizoate]0+ 0.064, R2=0.98), while k was less affected by the initial pH of the solution. The presence of Cl-, HCO3- and HA in the solution inhibited the degradation of diatrizoate. The low TOC removal rate and formation of organic by-products indicate that the degradation of diatrizoate was incomplete and only its side chain was destructed. The transformation pathways of diatrizoate in the heat-activated persulfate system mainly included amide bond cleavage, amino oxidation and decarboxylation-hydroxylation.

DOI 10.13671/j.hjkxxb.2019.0004
Citations Scopus - 1
2019 Liu T, Zhang Z, Wang Z, Wang Z-L, Bush R, 'Highly efficient and rapid removal of arsenic(iii) from aqueous solutions by nanoscale zero-valent iron supported on a zirconium 1,4-dicarboxybenzene metal-organic framework (UiO-66 MOF)', RSC ADVANCES, 9 39475-39487 (2019) [C1]
DOI 10.1039/c9ra08595e
Citations Scopus - 3Web of Science - 3
2019 Wang X, Wang Z, Tang Y, Xiao D, Zhang D, Huan Y, et al., 'Oxidative degradation of iodinated X-ray contrast media (iomeprol and iohexol) with sulfate radical: An experimental and theoretical study', CHEMICAL ENGINEERING JOURNAL, 368 999-1012 (2019)
DOI 10.1016/j.cej.2019.02.194
Citations Scopus - 13Web of Science - 8
2018 Xiao J-H, Zhou J, Wang Z-H, Li S-Y, Zhang W-C, Fang C-L, et al., 'Extraction of copper and zinc from naturally contaminated copper mine soils: Chemical fractionation analysis and risk assessment', JOURNAL OF CENTRAL SOUTH UNIVERSITY, 25 1274-1284 (2018) [C1]
DOI 10.1007/s11771-018-3824-6
2018 Li S, Hu S, Jiang W, Liu Y, Zhou Y, Liu J, Wang Z, 'Facile synthesis of cerium oxide nanoparticles decorated flower-like bismuth molybdate for enhanced photocatalytic activity toward organic pollutant degradation', Journal of Colloid and Interface Science, 530 171-178 (2018) [C1]
DOI 10.1016/j.jcis.2018.06.084
Citations Scopus - 91Web of Science - 81
2018 Huang Y, Sheng B, Wang Z, Liu Q, Yuan R, Xiao D, Liu J, 'Deciphering the degradation/chlorination mechanisms of maleic acid in the Fe(II)/peroxymonosulfate process: An often overlooked effect of chloride', Water Research, 145 453-463 (2018)

© 2018 Elsevier Ltd In recent years, a significant effort has been devoted into investigating the effects of chloride on the degradation kinetics of aromatic pollutants. The impac... [more]

© 2018 Elsevier Ltd In recent years, a significant effort has been devoted into investigating the effects of chloride on the degradation kinetics of aromatic pollutants. The impact of chloride on the decomposition of short-chain carboxylic acid intermediates from aromatics degradation has often been overlooked. In this study the roles of chloride in the oxidation of maleic acid (MA) in the Fe(II)/peroxymonosulfate (PMS) process was investigated. Degradation efficiency, reaction intermediates, adsorbable organic halogen (AOX) accumulation and mineralization were examined. The chloride ion (Cl-) was found to have an overall negative impact on MA degradation and mineralization in the Fe(II)/PMS system. The presence of Cl- led to the formation of chlorinated by-products and a high production of AOX. The mineralization of MA was decreased with increasing Cl- concentrations. Kinetic modeling demonstrated the impact of various radicals largely depended on the concentration of Cl-. The significance of Cl2¿- or Cl2 for MA destruction was enhanced with increasing Cl- content, and overwhelmed that of SO4¿- when the Cl- concentration was over 5 mM. In the absence of Cl-, SO4¿- was the primary radical responsible for MA oxidation. A possible degradation pathway is proposed (cis-trans isomerization, decarboxylation and halogenations processes). These results may help to understand the full oxidation pathways of refractory aromatic compounds and the mechanism of chlorinated by-products formation in industrial saline wastewater treatment.

DOI 10.1016/j.watres.2018.08.055
Citations Scopus - 29
2018 Yuan R, Hu L, Yu P, Wang H, Wang Z, Fang J, 'Nanostructured Co3O4 grown on nickel foam: An efficient and readily recyclable 3D catalyst for heterogeneous peroxymonosulfate activation', CHEMOSPHERE, 198 204-215 (2018)
DOI 10.1016/j.chemosphere.2018.01.135
Citations Scopus - 45Web of Science - 41
2018 Sheng B, Huang Y, Wang Z, Yang F, Ai L, Liu J, 'On peroxymonosulfate-based treatment of saline wastewater: When phosphate and chloride co-exist', RSC Advances, 8 13865-13870 (2018) [C1]
DOI 10.1039/c8ra00600h
Citations Scopus - 14Web of Science - 13
2018 Yang F, Huang Y, Fang C, Xue Y, Ai L, Liu J, Wang Z, 'Peroxymonosulfate/base process in saline wastewater treatment: The fight between alkalinity and chloride ions', Chemosphere, 199 84-88 (2018) [C1]
DOI 10.1016/j.chemosphere.2018.02.023
Citations Scopus - 28Web of Science - 19
2018 Jiang B, He H, Liu Y, Tang Y, Luo S, Wang Z, 'pH-dependent roles of polycarboxylates in electron transfer between Cr(VI) and weak electron donors', Chemosphere, 197 367-374 (2018) [C1]
DOI 10.1016/j.chemosphere.2018.01.047
Citations Scopus - 13Web of Science - 13
2018 Yuan R, Hu L, Yu P, Wang Z, Wang H, Fang J, 'Co3O4 nanocrystals/3D nitrogen-doped graphene aerogel: A synergistic hybrid for peroxymonosulfate activation toward the degradation of organic pollutants.', Chemosphere, 210 877-888 (2018) [C1]
DOI 10.1016/j.chemosphere.2018.07.065
Citations Scopus - 34Web of Science - 29
2017 Fang C, Lou X, Huang Y, Feng M, Wang Z, Liu J, 'Monochlorophenols degradation by UV/persulfate is immune to the presence of chloride: Illusion or reality?', Chemical Engineering Journal, 323 124-133 (2017) [C1]

© 2017 Elsevier B.V.The efficiency and, accordingly, the success of the advanced oxidation processes (AOPs) has generally been evaluated on the basis of degradation kinetics. In p... [more]

© 2017 Elsevier B.V.The efficiency and, accordingly, the success of the advanced oxidation processes (AOPs) has generally been evaluated on the basis of degradation kinetics. In practice, chloride in saline wastewater is often found to inhibit degradation processes. Therefore its highly desirable to develop more effective processes which are not affected by chloride. In this study, no significant interference of chloride with monochlorophenols (MCPs, e.g. 2-CP, 3-CP and 4-CP) degradation by the UV photo-activated persulfate (UV/PS) process has been observed. This indicated the ¿illusion¿ that the UV/PS process might have been an appropriate technology working under saline conditions. To further evaluate its applicability, the generation of reaction intermediates, of adsorbable organic halogen (AOX) accumulation and of acute toxicity of MCPs in the UV/PS system were examined. In reality, several aromatic chlorinated compounds (number of chlorine atoms¿=2), such as dichlorophenols and 2,3,5,3',5'-pentachloro-biphenyl, were identified and quantified. An accumulation and relative increase of AOX with reaction time was observed in the UV/PS/Cl system. The acute toxicity tests with Photobacterium phosphoreum indicated that the inhibition effect of UV/PS reactions increased with reaction time regardless of the presence of chloride or not. The results of this study might be helpful for assessing the PS-based technologies for saline wastewater treatment.

DOI 10.1016/j.cej.2017.04.094
Citations Scopus - 38Web of Science - 29
2017 Wang Z, Sun L, Lou X, Yang F, Feng M, Liu J, 'Chemical instability of graphene oxide following exposure to highly reactive radicals in advanced oxidation processes.', JOURNAL OF COLLOID AND INTERFACE SCIENCE, 507 51-58 (2017) [C1]
DOI 10.1016/j.jcis.2017.07.105
Citations Scopus - 11Web of Science - 11
2017 Lou X, Fang C, Geng Z, Jin Y, Xiao D, Wang Z, et al., 'Significantly enhanced base activation of peroxymonosulfate by polyphosphates: Kinetics and mechanism', CHEMOSPHERE, 173 529-534 (2017) [C1]
DOI 10.1016/j.chemosphere.2017.01.093
Citations Scopus - 31Web of Science - 26
2017 Fang C, Wang Z, Feng M, Huang Y, Yang F, Liu J, 'Trace bromide ion impurity leads to formation of chlorobromoaromatic by-products in peroxymonosulfate-based oxidation of chlorophenols', Chemosphere, 182 624-629 (2017) [C1]

© 2017 Elsevier Ltd Trace bromide (Br-) released from industrial effluents or brominated compounds is able to directly react with peroxymonosulfate (PMS) to generate a series of r... [more]

© 2017 Elsevier Ltd Trace bromide (Br-) released from industrial effluents or brominated compounds is able to directly react with peroxymonosulfate (PMS) to generate a series of reactive oxidants which can oxidize and also halogenate organics. We report the identification and evolution of by-products during 2,4,6-trichlorophenol (TCP) degradation in the presence of PMS and trace Br-. The influencing factors, including Br- concentration and pH, were investigated. The depletion of TCP was accelerated with increasing trace Br- concentration (0¿0.2¿mM) and was affected by the initial pH (3.0¿7.0). The chlorinated and brominated compounds were identified in simulated wastewater during treatment with PMS. Notably, the potential formation of chlorobromoaromatic by-products was demonstrated for the first time in the presence of PMS and trace Br-. The possible reaction pathways of TCP and its derivatives are discussed. These findings have important implications for the future applications of PMS-based oxidation processes.

DOI 10.1016/j.chemosphere.2017.05.065
Citations Scopus - 10Web of Science - 7
2017 Wang Z, Feng M, Fang C, Huang Y, Ai L, Yang F, et al., 'Both degradation and AOX accumulation are significantly enhanced in UV/peroxymonosulfate/4-chlorophenol/Cl- system: two sides of the same coin?', RSC ADVANCES, 7 12318-12321 (2017) [C1]
DOI 10.1039/c7ra01294b
Citations Scopus - 20Web of Science - 16
2017 Huang Y, Wang Z, Liu Q, Wang X, Yuan Z, Liu J, 'Effects of chloride on PMS-based pollutant degradation: A substantial discrepancy between dyes and their common decomposition intermediate (phthalic acid)', Chemosphere, 187 338-346 (2017) [C1]

© 2017 Elsevier Ltd A considerable effort has been devoted to elucidating the roles of chloride in oxidative degradation and chlorination of dyes. However, few investigations are ... [more]

© 2017 Elsevier Ltd A considerable effort has been devoted to elucidating the roles of chloride in oxidative degradation and chlorination of dyes. However, few investigations are available on kinetic analysis and transformation pathways of secondary degradation byproducts of dyes in saline wastewater treatment. Here the impact of chlorine on the degradation rate of phthalic acid, a typical dye degradation intermediate, by the Co2+/peroxymonosulfate (PMS) process was examined. Degradation efficiency, intermediate products, AOX (adsorbable organic halogen) formation and mineralization were considered. An overall negative impact was observed within the concentration of Cl- up to 100 mM, differing from the dual effect of chloride on dye degradation process as previously observed. The presence of high levels of Cl- led to a low production of AOX and a reduction of the formation of chlorinated by-products. The mineralization was also restrained when the Cl- concentration was increased. Degradation pathways for these processes are proposed. These findings provide valuable information about the degradation pathways of dyes and about the formation mechanism of chlorinated by-products in industrial saline wastewater treatment.

DOI 10.1016/j.chemosphere.2017.08.120
Citations Scopus - 22Web of Science - 15
2017 Li S, Hu S, Jiang W, Liu Y, Liu J, Wang Z, 'Synthesis of n-type TaON microspheres decorated by p-type Ag
DOI 10.1016/j.mcat.2017.03.027
Citations Scopus - 30Web of Science - 28
2017 Li S, Hu S, Jiang W, Liu Y, Liu J, Wang Z, 'Facile synthesis of flower-like Ag3VO4/Bi2WO6 heterojunction with enhanced visible-light photocatalytic activity', Journal of Colloid and Interface Science, 501 156-163 (2017) [C1]
DOI 10.1016/j.jcis.2017.04.057
Citations Scopus - 115Web of Science - 105
2017 Choppala G, Bush R, Moon E, Ward N, Wang Z, Bolan N, Sullivan L, 'Oxidative transformation of iron monosulfides and pyrite in estuarine sediments: Implications for trace metals mobilisation', Journal of Environmental Management, 186 158-166 (2017) [C1]
DOI 10.1016/j.jenvman.2016.06.062
Citations Scopus - 8Web of Science - 6
Co-authors Nanthi Bolan, Girish Choppala
2017 Wang Z, Ai L, Huang Y, Zhang J, Li S, Chen J, Yang F, 'Degradation of azo dye with activated peroxygens: When zero-valent iron meets chloride', RSC Advances, 7 30941-30948 (2017) [C1]
DOI 10.1039/c7ra03872k
Citations Scopus - 22Web of Science - 18
2017 Huang Y, Yang F, Ai L, Feng M, Wang C, Wang Z, Liu J, 'On the kinetics of organic pollutant degradation with Co2+/peroxymonosulfate process: When ammonium meets chloride', CHEMOSPHERE, 179 331-336 (2017) [C1]
DOI 10.1016/j.chemosphere.2017.03.110
Citations Scopus - 20Web of Science - 18
2017 Wang Z, Sun H, 'Nanoscale in Photocatalysis', NANOMATERIALS, 7 (2017)
DOI 10.3390/nano7040086
Citations Scopus - 1
2017 Li S, Hu S, Xu K, Jiang W, Liu J, Wang Z, 'A Novel Heterostructure of BiOI Nanosheets Anchored onto MWCNTs with Excellent Visible-Light Photocatalytic Activity', NANOMATERIALS, 7 (2017) [C1]
DOI 10.3390/nano7010022
Citations Scopus - 34Web of Science - 28
2016 Fang C, Xiao D, Liu W, Lou X, Zhou J, Wang Z, Liu J, 'Enhanced AOX accumulation and aquatic toxicity during 2,4,6-trichlorophenol degradation in a Co(II)/peroxymonosulfate/Cl
DOI 10.1016/j.chemosphere.2015.11.030
Citations Scopus - 45Web of Science - 39
2016 Jiang B, Wang X, Liu Y, Wang Z, Zheng J, Wu M, 'The roles of polycarboxylates in Cr(VI)/sulfite reaction system: Involvement of reactive oxygen species and intramolecular electron transfer', Journal of Hazardous Materials, 304 457-466 (2016) [C1]
DOI 10.1016/j.jhazmat.2015.11.011
Citations Scopus - 32Web of Science - 29
2016 Zhou J, Xiao JH, Fang CL, Xiao DX, Guo YG, Lou XY, et al., 'Degradation kinetics and mechanisms of chloronitrophenol in UV/PMS system', Zhongguo Huanjing Kexue/China Environmental Science, 36 66-73 (2016)

© 2016, Chinese Society for Environmental Sciences. All right reserved. The efficient removal of 4-chloro-2-nitrophenol (4C2NP) in ultraviolet (UV)/peroxymonosulfate (PMS) oxidati... [more]

© 2016, Chinese Society for Environmental Sciences. All right reserved. The efficient removal of 4-chloro-2-nitrophenol (4C2NP) in ultraviolet (UV)/peroxymonosulfate (PMS) oxidation system was investigated. The effects of pH, PMS dosage and concentrations of 4C2NP, chloride and nitrate ions on the degradation efficiency of 4C2NP were evaluated. No significant differences in 4C2NP degradation rate were observed at pH 2.0~5.0, but a further increase in pH value would inhibit the substrate decomposition. In addition, PMS dosage positively correlated with degradation rates of 4C2NP, while 4C2NP concentration had a negative effect. A typical dual effect of chloride concentrations on the 4C2NP degradation kinetics was observed, whereas the increasing concentrations of nitrate showed an indistinctively inhibitory effect on 4C2NP degradation. Dechlorination and denitration were the dominant degradation pathways during the oxidative degradation of 4C2NP, followed by the formation of chloride and nitrate ions. The released chloride from chloro groups would be involved in re-chlorination through radical reactions. Nitro groups released would be oxidized to stable nitrate, preventing re-nitration. Degradation mechanism of 4C2NP in a UV/PMS system was proposed based on intermediates identified.

Citations Scopus - 5
2016 Liu W, Fang C, Huang Y, Ai L, Yang F, Wang Z, Liu J, 'Is UV/Ce(IV) process a chloride-resistant AOPs for organic pollutants decontamination?', RSC Advances, 6 93558-93563 (2016) [C1]

© The Royal Society of Chemistry 2016. Most of the current advanced oxidation processes (AOPs) are vulnerable to the presence of chloride in saline wastewater treatment because ch... [more]

© The Royal Society of Chemistry 2016. Most of the current advanced oxidation processes (AOPs) are vulnerable to the presence of chloride in saline wastewater treatment because chloride not only affects the degradation kinetics but also probably leads to absorbable organic halogen (AOX) formation. Here we report an UV/Ce(iv) process can efficiently oxidize organic pollutants such as Acid Orange 7, even in the presence of chloride. Fluorescent probe technology suggests hydroxyl radicals were generated in UV/Ce(iv) process, but not in UV/Ce(iv)/Cl- system. In the presence of chloride, Ce(iv)-chloride complex was formed, which can directly oxidize dyes or generate reactive oxygen species by chlorine activation. Although degradation and mineralization rates of dyes were still inhibited to some extents by large amounts of chloride, but negligible AOX was generated. Therefore, UV/Ce(iv) process can be recommended as an alternative AOPs when treating acidic saline wastewater.

DOI 10.1039/c6ra21682j
Citations Scopus - 8Web of Science - 4
2016 Lou X, Xiao D, Fang C, Wang Z, Liu J, Guo Y, Lu S, 'Comparison of UV/hydrogen peroxide and UV/peroxydisulfate processes for the degradation of humic acid in the presence of halide ions', ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH, 23 4778-4785 (2016)
DOI 10.1007/s11356-015-5232-x
Citations Scopus - 23Web of Science - 22
2016 Huang Y, Wang Z, Fang C, Liu W, Lou X, Liu J, 'Importance of reagent addition order in contaminant degradation in an Fe(II)/PMS system', RSC ADVANCES, 6 70271-70276 (2016)
DOI 10.1039/c6ra14081e
Citations Scopus - 17Web of Science - 16
2016 Li X, Wang Z, Zhang B, Rykov AI, Ahmed MA, Wang J, 'Fe
DOI 10.1016/j.apcatb.2015.08.050
Citations Scopus - 213Web of Science - 199
2015 Jiang B, Liu Y, Zheng J, Tan M, Wang Z, Wu M, 'Synergetic Transformations of Multiple Pollutants Driven by Cr(VI)-Sulfite Reactions', Environmental Science and Technology, 49 12363-12371 (2015) [C1]

© 2015 American Chemical Society. Reduction of Cr(VI) is often deemed necessary to detoxify chromium contaminants; however, few investigations utilized this reaction for the purpo... [more]

© 2015 American Chemical Society. Reduction of Cr(VI) is often deemed necessary to detoxify chromium contaminants; however, few investigations utilized this reaction for the purpose of treating other industrial wastewaters. Here a widely used Cr(VI)-sulfite reaction system was upgraded to simultaneously transform multiple pollutants, namely, the reduction of Cr(VI) and oxidation of sulfite and other organic/inorganic pollutants in an acidic solution. As(III) was selected as a probe pollutant to examine the oxidation capacity of a Cr(VI)-sulfite system. Both ¿OH and SO4¿- were considered as the primary oxidants for As(III) oxidation, based on the results of electron spin resonance, fluorescence spectroscopy, and specific radicals quenching. As(III)-scavenging, oxidative radicals greatly accelerated Cr(VI) reduction and simultaneously consumed less sulfite. In comparison with a Cr(VI)-H2O2 system with 50 µM Cr(VI), Cr(VI), the sulfite system had excellent performance for both As(III) oxidation and Cr(VI) reduction at pH 3.5. Moreover, in this escalated process, less sulfite was required to reduce Cr(VI) than the traditional Cr(VI) reduction by sulfite process. This effectively improves the environmental compatibility of this Cr(VI) detoxification process, alleviating the potential for SO2 release and sulfate ion production in water. Generally, this study provides an excellent example of a "waste control by waste" strategy for the detoxification of multiple industrial pollutants.

DOI 10.1021/acs.est.5b03275
Citations Scopus - 99Web of Science - 94
2015 Wang Z, Xiao D, Bush RT, Liu J, 'Coprecipitated arsenate inhibits thermal transformation of 2-line ferrihydrite: Implications for long-term stability of ferrihydrite', Chemosphere, 122 88-93 (2015) [C1]

© 2014 Elsevier Ltd. 2-line ferrihydrite, a ubiquitous iron oxy-hydroxide found in natural and engineered systems, is an efficient sink for the toxic metalloids such as arsenic. W... [more]

© 2014 Elsevier Ltd. 2-line ferrihydrite, a ubiquitous iron oxy-hydroxide found in natural and engineered systems, is an efficient sink for the toxic metalloids such as arsenic. While much is known of the excellent capacity of ferrihydrite to coprecipitate arsenate, there is little information concerning the long-term stability of arsenate-accumulated ferrihydrite. By thermal treatment methodology, the expedited transformation of ferrihydrite in the presence of coprecipitated arsenate was studied at varying As/Fe ratios (0-0.5) and different heating temperature (40, 300, 450, 600. °C). Pure and transformed minerals were characterized by thermogravimetry (TG), X-ray diffraction (XRD), Electron Spin Resonance (ESR), Scanning Electron Microscopy-Energy Dispersive X-ray Spectroscopy (SEM-EDX) and Fourier Transform Infrared Spectroscopy (FTIR). Arsenate was found to retard the thermal transformation of ferrihydrite. The extents of ferrihydrite transformation to hematite decreased with increasing As/Fe ratios, but increased at a higher heating temperature. It is predicted that the coprecipitated arsenate can stabilize the amorphous iron oxides against the transformation to more crystalline solids. Arsenate concentration appears to play an important role in this predicted long-term stability.

DOI 10.1016/j.chemosphere.2014.11.017
Citations Scopus - 21Web of Science - 18
2015 Zhou J, Xiao J, Xiao D, Guo Y, Fang C, Lou X, et al., 'Transformations of chloro and nitro groups during the peroxymonosulfate-based oxidation of 4-chloro-2-nitrophenol', Chemosphere, 134 446-451 (2015) [C1]

© 2015 Elsevier Ltd. Dechlorination and denitration are known to occur during the oxidative degradation of chloronitroaromatic compounds, but the possibility of re-chlorination an... [more]

© 2015 Elsevier Ltd. Dechlorination and denitration are known to occur during the oxidative degradation of chloronitroaromatic compounds, but the possibility of re-chlorination and re-nitration of chloro and nitro groups is not assessed despite of its importance in evaluating the applicability of advanced oxidation processes (AOPs). In this study, transformation of chloro and nitro groups in degradation of 4-chloro-2-nitrophenol (4C2NP) by sulfate radical generated via Co-mediated peroxymonosulfate activation was investigated. Both chloride and nitrate ions were found as the main inorganic products of chloro and nitro groups in 4C2NP, but their levels were much lower than that of degraded parent 4C2NP. A typical dual effect of chloride on the 4C2NP degradation kinetics was observed, whereas no measurable influence was found for addition of low level nitrate. Re-chlorination took place, but re-nitration was not verified because several polychlorophenols but none of polynitrophenols were detected. The specific degradation mechanism involved in the transformation of nitro group and chloro group was proposed.

DOI 10.1016/j.chemosphere.2015.05.027
Citations Scopus - 64Web of Science - 52
2015 Li J, Luo G, Gao J, Yuan S, Du J, Wang Z, 'Quantitative evaluation of potential ecological risk of heavy metals in sewage sludge from three wastewater treatment plants in the main urban area of Wuxi, China', Chemistry and Ecology, 31 235-251 (2015)

© 2014, © 2014 Taylor &amp; Francis. In this study, the potential ecological risks and eco-toxicity of heavy metals (Cu, Pb, Zn, Ni, Cd, Cr, As and Hg) in sewage sludge were qua... [more]

© 2014, © 2014 Taylor & Francis. In this study, the potential ecological risks and eco-toxicity of heavy metals (Cu, Pb, Zn, Ni, Cd, Cr, As and Hg) in sewage sludge were quantitatively evaluated. Sewage sludge samples were collected from three wastewater treatment plants in Wuxi city during five years from 2009 to 2013. The levels of the eight metals temporally varied. The contents of Zn and Cu in the tested sewage sludge were the highest, followed by Cr, Ni, Pb and As, and the contents of Cd and Hg were the least. The Community Bureau of Reference (BCR) sequential extraction results showed that Zn, Ni and Cd had the highest mobilisation potential, while Cu, Pb, Cr and Hg were not stabilised and would release to the environment under oxidising conditions. The removal efficiency of Cu and Cr was higher than 70%, while that of As, Cd and Hg was less than other heavy metals. The overall potential ecological risk index (RI) of heavy metals in sewage sludge was 1376.34, revealing very high risk. However, the environmental risk values based on the index of geo-accumulation (I<inf>geo</inf>) and risk assessment code (RAC) were both low. Cd contamination is the major concern while the treated sewage sludge is used for agricultural purposes.

DOI 10.1080/02757540.2014.961439
Citations Scopus - 16Web of Science - 28
2015 Jiang B, Guo J, Wang Z, Zheng X, Zheng J, Wu W, et al., 'A green approach towards simultaneous remediations of chromium(VI) and arsenic(III) in aqueous solution', Chemical Engineering Journal, 262 1144-1151 (2015) [C1]

© 2014 Elsevier B.V. In this study, the applicability of glow discharge plasma for simultaneous redox transformations of Cr(VI) and As(III) was evaluated in aqueous solution. The ... [more]

© 2014 Elsevier B.V. In this study, the applicability of glow discharge plasma for simultaneous redox transformations of Cr(VI) and As(III) was evaluated in aqueous solution. The results showed that there was a beneficially synergistic effect between Cr(VI) reduction and As(III) oxidation. The presence of Cr(VI) can significantly enhance As(III) oxidation, whereas a slight increase for Cr(VI) reduction mediated by As(III) was observed. The added ethanol or dicarboxylic acids can increase the Cr(VI) reduction with different mechanisms, but significantly retard As(III) oxidation. The conversions of both As(III) and Cr(VI) can also be effectively increased from 96% to 100% and 53% to 77%, respectively, by increasing the voltage input from 530 to 600V. Cr(VI) reduction proceeded more rapidly, approximately 96% at pH 2.0, while As(III) oxidation was depressed under acidic conditions, only 70% at pH 2.0. And the optimal pH value for As(V) formation facilitated by Cr(VI) is 7.0. H2O2 generated in-situ in glow discharge plasma can reduce Cr(VI) and produce highly oxidizing OH that was responsible for As(III) oxidation. Reaction between As(III) and OH in turn partially avoided the re-oxidation of Cr(III) by OH to Cr(VI), thus facilitating the net conversion of Cr(VI). Our study demonstrated the feasibility of GDP for the coconversion of As(III) and Cr(VI), holding a great promise for real-world wastewater remediation.

DOI 10.1016/j.cej.2014.10.064
Citations Scopus - 37Web of Science - 35
2015 Xiao D, Lou X, Liu R, Guo Y, Zhou J, Fang C, et al., 'Fe-catalyzed photoreduction of Cr(VI) with dicarboxylic acid (C

© 2014 Balaban Desalination Publications. All rights reserved. Reduction of carcinogenic hexavalent chromium (Cr(VI)) by ferrous iron (Fe(II)) to essentially nontoxic trivalent ch... [more]

© 2014 Balaban Desalination Publications. All rights reserved. Reduction of carcinogenic hexavalent chromium (Cr(VI)) by ferrous iron (Fe(II)) to essentially nontoxic trivalent chromium (Cr(III)) is a simple and effective method for Cr(VI) decontamination. In this study, the photoreduction efficacy of Cr(VI) in acidic Fe(III)/Fe(II) solutions was examined in the presence of dicarboxylic acids (DCA) (i.e. oxalic acid (Oxal), malonic acid (Mal), succinic acid (Suc), and glutaric acid (Glu)). Rates of Cr(VI) reduction under UV irradiation depend on the photochemistry of Fe(III)/Fe(II) complexes with DCA, following the order of Oxal > Suc ¿ Glu > Mal. Fe(III)-oxalato complexes are favorable for transforming Cr(VI) due to the formation of relative abundance of Fe(II) and reductive radicals such as (Formula presented.) , (Formula presented.) after photoreaction, whereas Fe(III)-Mal complexes upon UV irradiation generate the lowest amount of Fe(II) among all the Fe-DCA complexes, and thus have poor capacity for Cr(VI) reduction. The effects of Suc and Glu on the Cr(VI) reduction are insignificant since the Fe(III)-OH complexes are still the main Fe(III) species due to their weak chelating abilities with Fe(III). This work has important implications for selecting the favorable ligands of Fe(III) for light-induced Cr(VI) transformation and designing the methods for treating wastewater with low-molecular-weight acids and Cr(VI).

DOI 10.1080/19443994.2014.941309
Citations Scopus - 4Web of Science - 4
2015 Ramjaun SN, Wang Z, Yuan R, Liu J, 'Can electrochemical oxidation techniques really decontaminate saline dyes wastewater?', Journal of Environmental Chemical Engineering, 3 1648-1653 (2015)

© 2015 Elsevier Ltd. All rights reserved. Formation of toxic chlorinated organic byproducts is of great concern when selecting electrochemical oxidation (EO) as decontamination te... [more]

© 2015 Elsevier Ltd. All rights reserved. Formation of toxic chlorinated organic byproducts is of great concern when selecting electrochemical oxidation (EO) as decontamination technology for saline dye wastewater, but still not verified. To test the applicability of EO, methyl orange (MO) was used as a model dye for anodic contact glow discharge electrolysis (CGDE) and conventional electrolysis (CE) in the presence of chloride. The degradation kinetics and organic intermediates were analyzed. In the presence of chloride, the rates of dye degradation were significantly increased as CGDE and CE were applied. CE resulted in higher mineralization efficiency than CGDE which needs much energy input. Several refractory chlorinated aromatic and even aliphatic compounds were identified during MO degradation, as well as the other anthraquinone dye, alizarin red S (AR). Therefore, the issues of toxic chlorinated byproducts and energy cost should be preferentially evaluated prior to the selection of EO technologies.

DOI 10.1016/j.jece.2015.06.006
Citations Scopus - 10
2014 Wang Z, Bush RT, Sullivan LA, Chen C, Liu J, 'Selective oxidation of arsenite by peroxymonosulfate with high utilization efficiency of oxidant', Environmental Science and Technology, 48 3978-3985 (2014) [C1]

Oxidation of arsenite (As(III)) is a critical yet often weak link in many current technologies for remediating contaminated groundwater. We report a novel, efficient oxidation rea... [more]

Oxidation of arsenite (As(III)) is a critical yet often weak link in many current technologies for remediating contaminated groundwater. We report a novel, efficient oxidation reaction for As(III) conversion to As(V) using commercial available peroxymonosulfate (PMS). As(III) is rapidly oxidized by PMS with a utilization efficiency larger than 90%. Increasing PMS concentrations and pH accelerate oxidation of As(III), independent to the availability of dissolved oxygen the addition of PMS enables As(III) to oxidize completely to As(V) within 24 h, even in the presence of high concentrations of radical scavengers. On the basis of these observations and theoretical calculations, a two-electron transfer (i.e., oxygen atom transfer) reaction pathway is proposed. Direct oxidation of As(III) by PMS avoids the formation of nonselective reactive radicals, thus minimizing the adverse impact of coexisting organic matter and maximizing the utilization efficiency of PMS therefore, this simple approach is considered a cost-effective water treatment method for the oxidation of As(III) to As(V). © 2014 American Chemical Society.

DOI 10.1021/es405143u
Citations Scopus - 74Web of Science - 64
2014 Liu R, Guo Y, Wang Z, Liu J, 'Iron species in layered clay: Efficient electron shuttles for simultaneous conversion of dyes and Cr(VI)', Chemosphere, 95 643-646 (2014) [C1]

The simultaneous reduction of Chromium(VI) (Cr(VI)) and oxidation of cationic dyes in dispersions of Montmorillonite K10 (MK10) were examined under visible irradiation (¿ 420 nm).... [more]

The simultaneous reduction of Chromium(VI) (Cr(VI)) and oxidation of cationic dyes in dispersions of Montmorillonite K10 (MK10) were examined under visible irradiation (¿ 420 nm). The iron species (i.e. iron oxides, structural iron and exchangeable interlayer iron) in layered clays are active for catalytically reducing Cr(VI) by using Malachite green (MG) and Rhodamine B (RhB) as the electron donors. Molecular oxygen does not have a significant effect on clay-catalyzed Cr(VI) reduction, but is important for oxidative degradation of dye pollutants. MK10 catalysts are stable and reusable, and are therefore considered as a promising naturally-abundant material for decontamination of dye and heavy metals. © 2013 Elsevier Ltd.

DOI 10.1016/j.chemosphere.2013.09.055
Citations Scopus - 17Web of Science - 15
2014 Xiao D, Guo Y, Lou X, Fang C, Wang Z, Liu J, 'Distinct effects of oxalate versus malonate on the iron redox chemistry: Implications for the photo-Fenton reaction', Chemosphere, 103 354-358 (2014) [C1]

The dicarboxylic acids oxalate (Oxal) and malonate (Mal) are frequently detected as the final low-molecular-weight organic acids during oxidative degradation of aromatic compounds... [more]

The dicarboxylic acids oxalate (Oxal) and malonate (Mal) are frequently detected as the final low-molecular-weight organic acids during oxidative degradation of aromatic compounds. Here a distinct effect of Oxal versus Mal on iron-based photocatalytic technologies was reported by testing the degradation efficiency of the dye rhodamine B. The rates of dye degradation in irradiated Fe(III) solutions depended on Fe(III/II) speciation, photoreactivities of Fe complexes and reactivities of Fe(II) complexes with H2O2. Photolysis of the Fe(III)-oxalato complex was favorable due to the formation of O2-, HO2 and OH for oxidizing the dye; however, an excess of H2O2 could quench the excited state of ferrioxalate, decreasing the degradation efficiency. In contrast, activities of UV/Fe(III) in the presence of Mal were significantly diminished because Fe(III)-Mal complexes, with much lower quantum yield of Fe(II) from photoreduction, dominated Fe(III) speciation. The results provide data for an understanding of the mechanism of iron redox (photo)chemistry mediated by diacids, which will aid in selecting appropriate Fe ligands, screening photo-Fenton conditions and designing UV/Fe(III) treatability. © 2013 Elsevier Ltd.

DOI 10.1016/j.chemosphere.2013.11.069
Citations Scopus - 19Web of Science - 19
2014 Yuan R, Wang Z, Hu Y, Wang B, Gao S, 'Probing the radical chemistry in UV/persulfate-based saline wastewater treatment: Kinetics modeling and byproducts identification', Chemosphere, 109 106-112 (2014) [C1]

The effect of Cl- on the oxidative degradation of Acid Orange 7 (AO7) was investigated in UV/S2O82- system to elucidate the chlorination pathways in saline wastewaters. Lower amou... [more]

The effect of Cl- on the oxidative degradation of Acid Orange 7 (AO7) was investigated in UV/S2O82- system to elucidate the chlorination pathways in saline wastewaters. Lower amount of Cl- as well as Br- enhanced the decoloration of AO7, but such promotion effect reduced gradually with the increasing halide ion dosage. The dye mineralization was found to be inhibited by Cl-, especially under acidic conditions. Results of kinetics modeling demonstrated that the fraction of different oxidizing radicals largely depended on the content of Cl-. At the initial pH of 6.5, Cl2- was much more abundant than SO4-. The significance of Cl2- for AO7 degradation increased with the increasing Cl- concentration and overwhelmed that of SO4- at [Cl-]>1mM. Without Cl-, SO4- was the predominant radical for AO7 degradation under acidic conditions, while OH prevailed gradually at higher pH. Under high salinity conditions, more OH can be formed and contributed to the dye degradation especially in alkaline medium, leading to higher destruction efficiency of AO7. Several chlorinated byproducts were detected in the presence of chloride ions, and SO4-/Cl2--based degradation pathways of AO7 were proposed. This work provides further understanding of the complex reaction mechanisms for SO4--based advanced oxidation processes in chloride-rich environments. © 2014 Elsevier Ltd.

DOI 10.1016/j.chemosphere.2014.03.007
Citations Scopus - 61Web of Science - 59
2014 Lou X, Wu L, Guo Y, Chen C, Wang Z, Xiao D, et al., 'Peroxymonosulfate activation by phosphate anion for organics degradation in water', Chemosphere, 117 582-585 (2014) [C1]

© 2014 Elsevier Ltd. Activation of peroxygens is a critical method to generate oxidative species, but often consumes additional chemical reagents and/or energy. Here we report a n... [more]

© 2014 Elsevier Ltd. Activation of peroxygens is a critical method to generate oxidative species, but often consumes additional chemical reagents and/or energy. Here we report a novel and efficient activation reaction for peroxymonosulfate (PMS) by phosphate anions (PBS). The PBS/PMS coupled system, at neutral pH, is able to decompose efficiently even mineralize a variety of organic pollutants, such as Acid Orange 7, Rhodamine B and 2,4,6-trichlorophenol. In contrast, no measurable degradation was observed when the PMS was replaced by other peroxygens (i.e. hydrogen peroxide and peroxydisulfate). Both PMS and PBS are indispensable for the oxidative degradation of pollutants. Increasing pH and concentrations of PMS and PBS significantly accelerate the degradation of organics. It is proposed that OH would be the major radical for contamination degradation at pH 7.0 through the radical quenching experiments. This work provides a new way of PMS activation for decontamination at neutral pH, in particular for phosphate-rich wastewater treatment.

DOI 10.1016/j.chemosphere.2014.09.046
Citations Scopus - 92Web of Science - 74
2014 Wang H, Zhang L, Chen Z, Hu J, Li S, Wang Z, et al., 'Semiconductor heterojunction photocatalysts: Design, construction, and photocatalytic performances', Chemical Society Reviews, 43 5234-5244 (2014)

Semiconductor-mediated photocatalysis has received tremendous attention as it holds great promise to address the worldwide energy and environmental issues. To overcome the serious... [more]

Semiconductor-mediated photocatalysis has received tremendous attention as it holds great promise to address the worldwide energy and environmental issues. To overcome the serious drawbacks of fast charge recombination and the limited visible-light absorption of semiconductor photocatalysts, many strategies have been developed in the past few decades and the most widely used one is to develop photocatalytic heterojunctions. This review attempts to summarize the recent progress in the rational design and fabrication of heterojunction photocatalysts, such as the semiconductor-semiconductor heterojunction, the semiconductor-metal heterojunction, the semiconductor-carbon heterojunction and the multicomponent heterojunction. The photocatalytic properties of the four junction systems are also discussed in relation to the environmental and energy applications, such as degradation of pollutants, hydrogen generation and photocatalytic disinfection. This tutorial review ends with a summary and some perspectives on the challenges and new directions in this exciting and still emerging area of research. This journal is © the Partner Organisations 2014.

DOI 10.1039/c4cs00126e
Citations Scopus - 1935Web of Science - 1882
2014 Wang Z, Liu J, 'New insight into photochemical oxidation of Fe(II): The roles of Fe(III) and reactive oxygen species', Catalysis Today, 224 244-250 (2014) [C1]

Photooxidation of Fe(II) at acidic pH occurs in photocatalytic processes of Fe(III) species, but its reaction mechanism is not well understood. The kinetics of Fe(II) oxidation in... [more]

Photooxidation of Fe(II) at acidic pH occurs in photocatalytic processes of Fe(III) species, but its reaction mechanism is not well understood. The kinetics of Fe(II) oxidation in irradiated aqueous solutions at pH 3.0 have been investigated in terms of kinetic modeling approach, rate constant estimation and the significance of various oxidation pathways. Fe(II) oxidation kinetics strongly rely on the availability of UV light, Fe(III) ions and oxygen. The presence of a portion of Fe(III) in Fe(II)-containing solutions favors the rapid oxidation of Fe(II). At high concentration of Fe(II), excitation of Fe(III) species may be quenched by Fe(II) in deaerated systems or may sensitize Fe(II) oxygenation under oxic conditions. By incorporation of this photosensitization pathway, the established model in this study is shown to be able to adequately describe the oxidation of Fe(II) at pH 3.0. Sensitivity analysis indicates that photolysis of Fe(III) species is critically important for overall Fe(II) oxidation kinetics. Fe(III)-catalyzed oxygenation of Fe(II), and oxidation of Fe(II) by HO2 and OH also exerts a marked impact on the oxidation of Fe(II). Therefore, Fe(III)-catalyzed oxygen activation and their secondary reactive oxygen species (ROS) account for the oxidation kinetics of Fe(II) at acidic pH. © 2013 Elsevier B.V.

DOI 10.1016/j.cattod.2013.09.063
Citations Scopus - 8Web of Science - 8
2014 Wang Z, Xiao D, Liu R, Guo Y, Lou X, Liu J, 'Fenton-like degradation of reactive dyes catalyzed by biogenic jarosite', Journal of Advanced Oxidation Technologies, 17 104-108 (2014)

A kind of Fe mineral-biogenic jarosite was prepared by biooxidation of Fe2+ using Acidithiobacillus ferrooxidans. Decolorization of reactive dyes, Reactive Blue 19 (RB) and Reacti... [more]

A kind of Fe mineral-biogenic jarosite was prepared by biooxidation of Fe2+ using Acidithiobacillus ferrooxidans. Decolorization of reactive dyes, Reactive Blue 19 (RB) and Reactive Orange 1 (RO), were conducted using asprepared jarosite as a catalyst in the presence of H2O2 via a Fenton-like reaction process. The experimental results indicated that jarosite can serve as an efficient Fe catalyst to initiate Fenton-like reaction in the process of dye decolorization. 98% of decolorization efficiency of RB was achieved within 105 min of reaction time by using 5 mM H2O 2 and 1 g/L jarosite catalyst at pH 5.0. The current investigation may provide a practical and costseffective way using biogenic Fe minerals for remediation of wastewater contaminated with industrial colorants. © 2014 Science &Technology Network, Inc.

DOI 10.1515/jaots-2014-0114
Citations Scopus - 5Web of Science - 5
2014 Guo Y, Zhou J, Lou X, Liu R, Xiao D, Fang C, et al., 'Enhanced degradation of Tetrabromobisphenol A in water by a UV/base/persulfate system: Kinetics and intermediates', Chemical Engineering Journal, 254 538-544 (2014) [C1]

Tetrabromobisphenol A (TBBPA), one of the most frequently used brominated flame retardants (BFRs), is only soluble in strongly alkaline solutions where most advanced oxidation pro... [more]

Tetrabromobisphenol A (TBBPA), one of the most frequently used brominated flame retardants (BFRs), is only soluble in strongly alkaline solutions where most advanced oxidation processes (AOPs) are inefficient or in organic solvents. It is highly desirable to develop an environmentally friendly cleanup technology for TBBPA which operates at alkaline pH without the need of organic solvents to enhance its solubility in water. In this study a favorable UV/base/persulfate (PS) system for rapid degradation of TBBPA in aqueous solution is reported. Increases of initial pH and PS concentrations have positive effects on the degradation of TBBPA and a high initial TBBPA concentration has a negative influence. The addition of Br- has a negligible effect on the degradation of TBBPA. The low TOC removal and degradation intermediates of TBBPA identified by GC-MS suggested that TBBPA was degraded via the cleavage between the isopropyl group and one of the benzene rings rather than complete debromination and degradation. The present study provides a simple and green approach to detoxify TBBPA in water rather than using toxic organic solvents. © 2014 Elsevier B.V.

DOI 10.1016/j.cej.2014.05.143
Citations Scopus - 74Web of Science - 65
2014 Liu R, Xiao D, Guo Y, Wang Z, Liu J, 'A novel photosensitized Fenton reaction catalyzed by sandwiched iron in synthetic nontronite', RSC Advances, 4 12958-12963 (2014)

The conventional photo-Fenton reaction often suffers from the constraints of operation pH, low iron loading, ultraviolet availability in solar light and instability of iron-based ... [more]

The conventional photo-Fenton reaction often suffers from the constraints of operation pH, low iron loading, ultraviolet availability in solar light and instability of iron-based catalysts. Here we report a novel heterogeneous Fenton reaction which works with a dye-photosensitized structural Fe(iii)/Fe(ii) redox cycling mechanism. The synthesized nontronite catalyst (NAU) was characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectra (FTIR), X-ray photoelectron spectroscopy (XPS) analysis, and thermal gravimetric analysis (TG). NAU exhibited excellent catalytic activity over a wide pH range (3.0-8.0) for highly efficient degradation of Rhodamine B by hydrogen peroxide (H2O2) under visible light irradiation (¿ > 420 nm). The excited dye molecule donates electrons to structural iron sandwiched in NAU which further catalyzes H2O2 to generate highly reactive OH radicals. This iron-rich clay mineral (total Fe, 24.4 wt%) is chemically and mechanically stable. There are no measurable iron leaching, nor any noticeable loss of activity and damage to the clay structure observed after 6 recycles. Therefore, NAU clay has outstanding merits for the practical treatment of organic dye pollutants at large scale. This journal is © the Partner Organisations 2014.

DOI 10.1039/c3ra47359g
Citations Scopus - 15Web of Science - 14
2014 Wang Z, 'Probing the importance of planar surfaces and crystal edges for electron transfer within iron-bearing clays', RSC Advances, 4 31476-31480 (2014)

We demonstrated the importance of basal planes and crystal edge for electron transfer within montmorillonite (MK10) and nontronite (NAu-2) by a facile dye-sensitized photoreductio... [more]

We demonstrated the importance of basal planes and crystal edge for electron transfer within montmorillonite (MK10) and nontronite (NAu-2) by a facile dye-sensitized photoreduction method. It was found that not all structural Fe in the clay matrix was redox-active. The results are vital to the utilization of naturally abundant clays in environmental redox chemistry. This journal is © the Partner Organisations 2014.

DOI 10.1039/c4ra04521a
Citations Scopus - 4Web of Science - 4
2014 Wang Z, Xiao D, Liu J, 'Diverse redox chemistry of photo/ferrioxalate system', RSC Advances, 4 44654-44658 (2014)

© 2014 the Partner Organisations. The diverse redox processes of the photo/ferrioxalate system (PFS) were investigated by varying the concentrations of Fe(iii), oxalate and oxygen... [more]

© 2014 the Partner Organisations. The diverse redox processes of the photo/ferrioxalate system (PFS) were investigated by varying the concentrations of Fe(iii), oxalate and oxygen. Photoreactivity of PFS is determined by the prevalence of the most photolabile Fe(iii) and abundance of Fe(iii) and oxalate, which is critical for the operation optimization of PFS in wastewater treatment.

DOI 10.1039/c4ra07153k
Citations Scopus - 12Web of Science - 12
2014 Zhou S, Li Y, Chen J, Liu Z, Wang Z, Na P, 'Enhanced Cr(vi) removal from aqueous solutions using Ni/Fe bimetallic nanoparticles: Characterization, kinetics and mechanism', RSC Advances, 4 50699-50707 (2014)

© the Partner Organisations 2014. In this study, Ni/Fe bimetallic nanoparticles were prepared by a liquid-phase chemical reduction method and characterized by scanning electron mi... [more]

© the Partner Organisations 2014. In this study, Ni/Fe bimetallic nanoparticles were prepared by a liquid-phase chemical reduction method and characterized by scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDS) with image mapping, transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The as-prepared Ni/Fe material was applied to remove Cr(vi) via a coupled adsorption/reduction process. It was found that Cr(vi) removal followed pseudo-second-order reaction kinetics. Acidic pH favored the efficient removal of Cr(vi) due to the abundance of reactive H species that were mediated by the Ni catalyst. XPS studies demonstrated that Cr(vi) removal on the surface of the bimetallic nanoparticles was a synergistic adsorption and reduction process. The introduction of nickel to nZVI not only controls iron passivation but also facilitates the efficient flow of electron transfer between iron and Cr(vi), and thus the efficient reduction of Cr(vi) to Cr(iii). Hydroxylated Cr(OH)3 and co-precipitation of CrxFe1-x(OH)3 were the final products of Cr(vi) removal by the Ni/Fe material. This journal is

DOI 10.1039/c4ra08754b
Citations Scopus - 43
2013 Wang Z, Bush RT, Sullivan LA, Liu J, 'Simultaneous redox conversion of chromium(VI) and arsenic(III) under acidic conditions', Environmental Science and Technology, 47 6486-6492 (2013) [C1]

Arsenic and chromium are often abundant constituents of acid mine drainage (AMD) and are most harmful as arsenite (As(III)) and hexavalent (Cr(VI)). To simultaneously change their... [more]

Arsenic and chromium are often abundant constituents of acid mine drainage (AMD) and are most harmful as arsenite (As(III)) and hexavalent (Cr(VI)). To simultaneously change their oxidation state from As(III) to As(V), and Cr(VI) to Cr(III), is a potentially effective and attractive strategy for environmental remediation. The coabundance of As(III) and Cr(VI) in natural environments indicates their negligible direct interaction. The addition of H 2O2 enables and greatly accelerates the simultaneous oxidation of As(III) and reduction of Cr(VI). These reactions are further enhanced at acidic pH and higher concentrations of Cr(VI). However, the presence of ligands (i.e., oxalate, citrate, pyrophosphate) greatly retards the oxidation of As(III), even though it enhances the reduction of Cr(VI). To explain these results we propose a reaction mechanism where Cr(VI) is primarily reduced to Cr(III) by H2O2, via the intermediate tetraperoxochromate Cr(V). Cr(V) is then involved in the formation of ¿OH radicals. In the presence of ligands, the capacity of Cr(V) to form ¿OH radicals, which are primarily responsible for As(III) oxidation, is practically inhibited. Our findings demonstrate the feasibility for the coconversion of As(III) and Cr(VI) in AMD and real-world constraints to this strategy for environmental remediation. © 2013 American Chemical Society.

DOI 10.1021/es400547p
Citations Scopus - 60Web of Science - 55
2013 Guo Y, Lou X, Fang C, Xiao D, Wang Z, Liu J, 'Novel photo-sulfite system: Toward simultaneous transformations of inorganic and organic pollutants', Environmental Science and Technology, 47 11174-11181 (2013) [C1]

An efficient and green advanced oxidation process (i.e., photo-sulfite reaction) for the simultaneous oxidation of sulfite and organic pollutants in water is reported. The photo-s... [more]

An efficient and green advanced oxidation process (i.e., photo-sulfite reaction) for the simultaneous oxidation of sulfite and organic pollutants in water is reported. The photo-sulfite system (UV-Fe(III)-sulfite) is based on the Fe-catalyzed sulfite oxidation and photochemistry of Fe(III) species. SO 4¿- and ¿OH radicals were identified in the photo-sulfite system with radical scavenging experiments using specific alcohols. This novel technology was consistently proven to be more favorable than the alternative Fe(III)-sulfite systems for the degradation of 2,4,6-trichlorophenol (2,4,6-TCP) and other organic pollutants at all conditions tested. The reactivity of photo-sulfite system was sustained due to the spontaneous switch of photoactive species from Fe(III)-sulfito to Fe(III)-hydroxo complexes with the depletion of sulfite and the decrease in pH. In contrast, in the absence of light the performance of the Fe(III)-sulfite system was greatly diminished after the consumption of sulfite. The formation of the Fe(III)-sulfito complex is a necessary step for initiating the photo-sulfite reaction. Inhibition of the oxidation of 2,4,6-TCP and methyl orange (MO) was observed in the presence of ligands that can stabilize one or more of the reactants: Fe(III), Fe(II), or sulfite. Our study provides a new facile route for the generation of SO4¿- and simultaneous removal of organic and inorganic pollutants. © 2013 American Chemical Society.

DOI 10.1021/es403199p
Citations Scopus - 91Web of Science - 81
2013 Wang Z, Bush RT, Liu J, 'Arsenic(III) and iron(II) co-oxidation by oxygen and hydrogen peroxide: Divergent reactions in the presence of organic ligands', Chemosphere, 93 1936-1941 (2013) [C1]

Iron-catalyzed oxidation of As(III) to As(V) can be highly effective for toxic arsenic removal via Fenton reaction and Fe(II) oxygenation. However, the contribution of ubiquitous ... [more]

Iron-catalyzed oxidation of As(III) to As(V) can be highly effective for toxic arsenic removal via Fenton reaction and Fe(II) oxygenation. However, the contribution of ubiquitous organic ligands is poorly understood, despite its significant role in redox chemistry of arsenic in natural and engineered systems. In this work, selected naturally occurring organic ligands and synthetic ligands in co-oxidation of Fe(II) and As(III) were examined as a function of pH, Fe(II), H2O2, and radical scavengers (methanol and 2-propanol) concentration. As(III) was not measurably oxidised in the presence of excess ethylenediaminetetraacetic acid (EDTA) (i.e. Fe(II):EDTA<1:1), contrasting with the rapid oxidation of Fe(II) by O2 and H2O2 at neutral pH under the same conditions. However, partial oxidation of As(III) was observed at a 2:1 ratio of Fe(II):EDTA. Rapid Fe(II) oxidation in the presence of organic ligands did not necessarily result in the coupled As(III) oxidation. Organic ligands act as both iron speciation regulators and radicals scavengers. Further quenching experiments suggested both hydroxyl radicals and high-valent Fe species contributed to As(III) oxidation. The present findings are significant for the better understanding of aquatic redox chemistry of iron and arsenic in the environment and for optimization of iron-catalyzed arsenic remediation technology. © 2013 Elsevier Ltd.

DOI 10.1016/j.chemosphere.2013.06.076
Citations Scopus - 27Web of Science - 26
2013 Lou XY, Guo YG, Xiao DX, Wang ZH, Lu SY, Liu JS, 'Rapid dye degradation with reactive oxidants generated by chloride-induced peroxymonosulfate activation', Environmental Science and Pollution Research, 20 6317-6323 (2013)

Transition-metal is known to catalyze peroxymonosulfate (PMS) decomposition to produce sulfate radicals. Here we report reactions between PMS and chloride, without a need of trans... [more]

Transition-metal is known to catalyze peroxymonosulfate (PMS) decomposition to produce sulfate radicals. Here we report reactions between PMS and chloride, without a need of transition metals, also can be used to degrade organic dye pollutant (Rhodamine B, (RhB)). Some important operating parameters, such as dosages of PMS and Cl-, pH of solution, temperature, ionic strength, and several common cations, were systematically investigated. Almost complete decoloration of RhB was achieved within 5 min ([PMS] = 0.5 mM, [Cl-] = 120 mM, and pH 3.0), and RhB bleaching rate increased with the increased dosages of both PMS and chloride ion, following the pseudo-first-order kinetic model. However, the total organic carbon (TOC) removal results demonstrated that the decoloration of RhB was due to the destruction of chromophore rather than complete degradation. RhB decoloration could be significantly accelerated due to the high ionic strength. Increasing of the reaction temperature from 273 K to 333 K was beneficial to the RhB degradation, and the activation energy was determined to be 32.996 kJ/mol. Bleaching rate of RhB with the examined cations increased with the order of NH4+ < Na+ < K+ < Al3+ < Ca2+ < Mg2+. Some major degradation products of RhB were identified by GC-MS. The present study may have active technical implications for the treatment of dyestuff wastewater in practice. © 2013 Springer-Verlag Berlin Heidelberg.

DOI 10.1007/s11356-013-1678-x
Citations Scopus - 37Web of Science - 29
2013 Guo YG, Huang P, Zhang WG, Yuan XW, Fan FX, Wang HL, et al., 'Leaching of heavy metals from Dexing copper mine tailings pond', Transactions of Nonferrous Metals Society of China (English Edition), 23 3068-3075 (2013)

The wastewater source of 4# tailing pond in Dexing copper mine consists of alkaline flotation pulp and acid mine drainage (AMD) from the nearby opencast mine. Therefore, the heavy... [more]

The wastewater source of 4# tailing pond in Dexing copper mine consists of alkaline flotation pulp and acid mine drainage (AMD) from the nearby opencast mine. Therefore, the heavy metals in tailing ore are very likely to be released due to acidification from AMD. The leaching behaviors of Zn, Cu, Fe and Mn in mine tailings from Dexing copper mine were investigated by a series of laboratory batch experiments. The effectcs of pH, temperature, particle size and contact time on the leachability of such heavy metals were examined. It was evident that Zn, Cu, Fe and Mn were major heavy metals in the tailings while gangue minerals like quartz were major constituents in examined tailings. The tailing dissolution reaction was controlled by the acid, whose kinetics could be expressed according to the heterogeneous reaction models and explained by a shrinking core model with the surface chemical reaction as the rate-controlling step. The leachability of all metals examined depended on pH and contact time. The batch studies indicated that the maximum leaching ratios of Zn, Cu, Fe and Mn at pH 2.0 were 5.4%, 5.8%, 11.1% and 34.1%, respectively. The dissolubility of all metals examined was positively correlated to the temperatures. The particle size would not change dissolution tendency of those heavy metals, but decrease the concentrations of leached heavy metals. © 2013 The Nonferrous Metals Society of China.

DOI 10.1016/S1003-6326(13)62835-6
Citations Scopus - 42
2013 Xu L, Yuan R, Guo Y, Xiao D, Cao Y, Wang Z, Liu J, 'Sulfate radical-induced degradation of 2,4,6-trichlorophenol: A de novo formation of chlorinated compounds', Chemical Engineering Journal, 217 169-173 (2013) [C1]

The degradation of 2,4,6-trichlorophenol (TCP) by sulfate radical generated via Co(II)-mediated activation of peroxymonosulfate (PMS) was examined. The influencing factors, such a... [more]

The degradation of 2,4,6-trichlorophenol (TCP) by sulfate radical generated via Co(II)-mediated activation of peroxymonosulfate (PMS) was examined. The influencing factors, such as substrate concentration and pH were investigated. The initial pH and its adjustment orders significantly affected the TCP degradation and mineralization. Several chlorinated products were detected, as well as some carboxylic acids, such as glycolic acid and oxalic acid. Many polychlorinated (chlorine atom number =3) aromatics (e.g. 2,4,5-trichlorophenol, 2,3,4,6-tetrachlorophenol, 2,3,5,6-tetrachloro-1,4-benzenediol) and even their ring-opening products (e.g. 2,4-dichloro-5-oxo-2-hexenedioic acid, 1,1,3,3-tetrachloro-2-propanone) were identified, indicating a de novo formation mechanism of organohalogens may be involved in TCP degradation. The released chlorine atoms from TCP and/or dichloride radicals activated by sulfate radicals played an important role. This finding may have significant scientific and technical implications for utilizing Co/PMS reagent to detoxify chlorinated pollutants. © 2012 Elsevier B.V.

DOI 10.1016/j.cej.2012.11.112
Citations Scopus - 78Web of Science - 64
2012 Guo Y, Lou X, Xiao D, Xu L, Wang Z, Liu J, 'Sequential reduction-oxidation for photocatalytic degradation of tetrabromobisphenol A: Kinetics and intermediates', Journal of Hazardous Materials, 241-242 301-306 (2012) [C1]

CBr bond cleavage is considered as a key step to reduce their toxicities and increase degradation rates for most brominated organic pollutants. Here a sequential reduction/oxidati... [more]

CBr bond cleavage is considered as a key step to reduce their toxicities and increase degradation rates for most brominated organic pollutants. Here a sequential reduction/oxidation strategy (i.e. debromination followed by photocatalytic oxidation) for photocatalytic degradation of tetrabromobisphenol A (TBBPA), one of the most frequently used brominated flame retardants, was proposed on the basis of kinetic analysis and intermediates identification. The results demonstrated that the rates of debromination and even photodegradation of TBBPA strongly depended on the atmospheres, initial TBBPA concentrations, pH of the reaction solution, hydrogen donors, and electron acceptors. These kinetic data and byproducts identification obtained by GC-MS measurement indicated that reductive debromination reaction by photo-induced electrons dominated under N2-saturated condition, while oxidation reaction by photoexcited holes or hydroxyl radicals played a leading role when air was saturated. It also suggested that the reaction might be further optimized for pretreatment of TBBPA-contaminated wastewater by a two-stage reductive debromination/subsequent oxidative decomposition process in the UV-TiO2 system by changing the reaction atmospheres. © 2012 Elsevier B.V.

DOI 10.1016/j.jhazmat.2012.09.044
Citations Scopus - 39Web of Science - 38
2012 Wang ZH, Xie XH, Liu JS, 'Experimental measurements of short-term adsorption of Acidithiobacillus ferrooxidans onto chalcopyrite', Transactions of Nonferrous Metals Society of China (English Edition), 22 442-446 (2012)

The influencing factors in adsorption such as adsorption time, pulp concentration, bacterial concentration, pH as well as ionic strength were investigated to explore the relations... [more]

The influencing factors in adsorption such as adsorption time, pulp concentration, bacterial concentration, pH as well as ionic strength were investigated to explore the relationship among them and bacterial adsorption. The adsorption was a rapid process for bacterial adhesion to chalcopyrite. The extent of adsorption increased with increasing initial bacterial concentration and pulp concentration. The optimal pH for Acidithiobacillus ferrooxidans adsorption onto chalcopyrite surfaces was in the range of pH 1-3. The increase of ionic strength led to decrease in bacterial adsorption, which can be well explained by electric double layer theory. The adsorption behavior appeared to be controlled by both hydrophobic and electrostatic interactions at the interface of bacteria and mineral. © 2012 The Nonferrous Metals Society of China.

DOI 10.1016/S1003-6326(11)61196-5
Citations Scopus - 11Web of Science - 8
2012 Wang Z, Song W, Ma W, Zhao J, 'Environmental photochemistry of iron complexes and their involvement in environmental chemical processes', Progress in Chemistry, 24 423-432 (2012)

Iron is one of the most abundant metals in the continental crust, while most of dissolved iron is complexed with organic ligands. The irradiated iron complexes in the environment ... [more]

Iron is one of the most abundant metals in the continental crust, while most of dissolved iron is complexed with organic ligands. The irradiated iron complexes in the environment undergo direct photolysis and secondary (photo)chemical reactions, generating Fe(II), organic radicals and some reactive oxygen species (ROS). Environmental photochemistry of iron complexes can greatly affect ROS dynamics, organics degradation and redox cycling of other elements. Therefore, it is becoming a hot topic in the international field of environmental sciences research. This review firstly summarizes three types of iron complexes including inorganic Fe complexes, simple organic Fe complexes and macrocyclic organic Fe complexes, and photoreduction mechanisms of iron complexes. Secondly, the potential oxidants of Fe(II) in acidic aquatic environment are introduced. The oxidation kinetics, possible reaction mechanism and influencing factors (such as dissolved oxygen concentration, pH, ionic strength, temperature and natural organic matters concentrations) of (photo)chemical oxidation of Fe(II) are elucidated. This review also highlights recent findings in the study of environmental processes involving iron photochemistry. Finally, the future prospects in this field are discussed based on the current status.

Citations Scopus - 11
2012 Yuan R, Ramjaun SN, Wang Z, Liu J, 'Photocatalytic degradation and chlorination of azo dye in saline wastewater: Kinetics and AOX formation', Chemical Engineering Journal, 192 171-178 (2012) [C1]

Chloride ion as one of the major salt components in dyestuff wastewaters can greatly affect the homogenous OH radical-based advanced oxidation processes (AOPs), but little informa... [more]

Chloride ion as one of the major salt components in dyestuff wastewaters can greatly affect the homogenous OH radical-based advanced oxidation processes (AOPs), but little information is available now for heterogeneous AOPs like UV/TiO2 under similar conditions. Here the effects of chloride on kinetics and reaction intermediates of dye degradation in heterogeneous photocatalysis were examined. The dye degradation efficiency in UV/TiO2 process was investigated as a function of a wide range of salinity and pH. The chloride ion was found to have a dual effect on both the dye decoloration and mineralization in UV/TiO2 system due to different mechanisms involved. Higher Cl- concentration would inhibit dye degradation, especially in acidic medium. AOX (halogenated organic compounds adsorbable on activated carbon) generated increased with the increasing content of chloride ion present in the solution. Several toxic chlorinated byproducts were firstly identified during the dye degradation in UV/TiO2 process using GC-MS method and possible decomposition pathways were proposed. These findings may have significant technical implications for optimizing the photochemical technologies in salt-rich wastewater treatment. © 2012 Elsevier B.V.

DOI 10.1016/j.cej.2012.03.080
Citations Scopus - 95Web of Science - 90
2012 Yuan R, Ramjaun SN, Wang Z, Liu J, 'Concentration profiles of chlorine radicals and their significances in

In order to further understand the mechanism details during saline wastewater treatment by ¿OH-based advanced oxidation processes (AOPs), the degradation efficiency of an azo dye ... [more]

In order to further understand the mechanism details during saline wastewater treatment by ¿OH-based advanced oxidation processes (AOPs), the degradation efficiency of an azo dye Acid Orange 7 (AO7) in UV/H2O2 process was investigated as a function of a wide range of salinity and pH. Kinetic modeling results demonstrated that the inhibitory effect of Cl- on AO7 degradation observed in the laboratory experiments could be attributed to both scavenging effect of Cl- on ¿OH and the much lower reactivity of chlorine radicals formed, although the chlorine radicals may be more abundant than ¿OH. Such retardation behavior was favored under acidic conditions due to a lower yield of ¿OH generated by the dissociation of ClOH¿- to ¿OH and Cl-. Traces of Br- had a greater inhibitory effect on AO7 bleaching rate than Cl-. AOX (halogenated organic compounds adsorbable on activated carbon) was found to increase with the increasing content of Cl-. Based on the intermediate products and especially several toxic halogenated byproducts identified by GC-MS, the possible degradation pathways of saline dyeing wastewater were proposed. © 2012 Elsevier B.V.

DOI 10.1016/j.cej.2012.07.127
Citations Scopus - 46Web of Science - 38
2012 Wang Z, Chen C, Ma W, Zhao J, 'Photochemical coupling of iron redox reactions and transformation of low-molecular-weight organic matter', Journal of Physical Chemistry Letters, 3 2044-2051 (2012)

The photoreactions between Fe(III)/Fe(II) and low-molecular-weight organic matter (LMWOM) under solar irradiation have significant implications for many biogeochemical cycles on t... [more]

The photoreactions between Fe(III)/Fe(II) and low-molecular-weight organic matter (LMWOM) under solar irradiation have significant implications for many biogeochemical cycles on the Earth and for the fates of environmental pollutants. In this Perspective, we focus on several fundamental aspects of the photochemical processes that couple the redox cycling of iron species and transformation of organic substrates. The primary photoprocesses (e.g., intramolecular electron transfer or photodissociation) are first highlighted by introducing the recently disputed observations on the photolysis of ferrioxalate complexes. The effects of LMWOM and its daughter radicals on the photochemical redox cycling of iron species are discussed with special attention given to the example of Fe-malonate complexes. These processes and mechanisms would provide us some refreshed understanding of environmental photochemistry of LMWOM and the iron species and would be helpful for our assessment of photochemical decontamination of organic pollutants. © 2012 American Chemical Society.

DOI 10.1021/jz3005333
Citations Scopus - 31Web of Science - 30
2011 Ramjaun SN, Yuan R, Wang Z, Liu J, 'Degradation of reactive dyes by contact glow discharge electrolysis in the presence of Cl

The plasma generated around the anode during contact glow discharge electrolysis (CGDE) is a rich source of hydroxyl (OH) radicals that can efficiently degrade organic contaminant... [more]

The plasma generated around the anode during contact glow discharge electrolysis (CGDE) is a rich source of hydroxyl (OH) radicals that can efficiently degrade organic contaminants in aqueous solutions. The degradation of textile azo dyestuffs, Reactive Yellow 176 (Y3RS), Reactive Red 239 (R3BS) and Reactive Black 5 (B5), by anodic CGDE was investigated in the presence of chloride (Cl-) ions. The degradation kinetics of the dyes was dependent on the concentration of Cl- ions and on the respective dye being treated. R3BS degradation was inhibited by Cl- ions in the range of 0-0.01 M. When the Cl- ion concentration was less than 0.02 M, the dyes followed pseudo first-order degradation kinetics. For concentrations greater than 0.02 M, the degradation of Y3RS and B5 was significantly enhanced compared to the degradation of R3BS and deviated from first-order reaction kinetics. The presence of Cl- ions (0.03 M) did not appear to improve dye mineralization but resulted in the formation of adsorbable organic halogens (AOX). The results indicated that the AOX could be abated with prolonged electrolytic treatment. This observation is significant for the assessment of the environmental impact of this technology for wastewater treatment. © 2011 Elsevier Ltd. All rights reserved.

DOI 10.1016/j.electacta.2011.09.052
Citations Scopus - 35Web of Science - 31
2011 Wang Z, Yuan R, Guo Y, Xu L, Liu J, 'Effects of chloride ions on bleaching of azo dyes by Co2+/oxone regent: Kinetic analysis', Journal of Hazardous Materials, 190 1083-1087 (2011) [C1]

Orange II (Org II), one of the most common used azo dyes, was taken as a model to investigate the effects of chloride ion on dye decoloration in cobalt/peroxymonosulfate (Co/PMS) ... [more]

Orange II (Org II), one of the most common used azo dyes, was taken as a model to investigate the effects of chloride ion on dye decoloration in cobalt/peroxymonosulfate (Co/PMS) system. A significant decrease in the rate of Org II decoloration was observed upon addition of Cl- (0.05-10mM), but further addition of Cl- (>50mM) apparently accelerated dyes degradation. This dual effect of chloride on dyes bleaching was also observed as other halide ions (e.g. Br-, I-) or other azo dyes were present in Co/PMS system. In the Co-free PMS solutions, the observed first-order rate constant always exponentially increased with the chloride content. The reactive chlorine species generated from chloride oxidation by PMS should be responsible for this non-radical mechanism for dye decoloration, however, these rapid decoloration of Org II as chloride ion was present, did not readily lead to much mineralization. Therefore, this finding may have significant technical implications for utilizing Co/PMS regent to detoxify chloride-rich azo dyes wastewater. © 2011 Elsevier B.V.

DOI 10.1016/j.jhazmat.2011.04.016
Citations Scopus - 199Web of Science - 170
2011 Yuan R, Ramjaun SN, Wang Z, Liu J, 'Effects of chloride ion on degradation of Acid Orange 7 by sulfate radical-based advanced oxidation process: Implications for formation of chlorinated aromatic compounds', Journal of Hazardous Materials, 196 173-179 (2011) [C1]

Sodium chloride is a common salt used during textile wet processes. Here a dual effect of chloride (i.e. inhibitory and accelerating effect) on azo dye (Acid Orange 7, AO7) degrad... [more]

Sodium chloride is a common salt used during textile wet processes. Here a dual effect of chloride (i.e. inhibitory and accelerating effect) on azo dye (Acid Orange 7, AO7) degradation in an emerging cobalt/peroxymonosulfate (Co/PMS) advanced oxidation process (AOP) was reported. Compared to OH-based AOPs, high concentrations of chloride (>5mM) can significantly enhance dye decoloration independent of the presence of the Co 2+ catalyst, but did greatly inhibit dye mineralization to an extent which was closely dependent upon the chloride content. Both UV-vis absorbance spectra and AOX determination indicated the formation of some refractory byproducts. Some chlorinated aromatic compounds, including 3-chloroisocoumain, 2-chloro-7-hydroxynaphthalene, 1,3,5-trichloro-2-nitrobenzene and tetrachlorohydroquione, were identified by GC-MS measurement in both Co/PMS/Cl - and PMS/Cl - reaction systems. Based on those experimental results, two possible branched (SO 4- radical-based and non-radical) reaction pathways are proposed. This is one of the very few studies dealing with chlorinated organic intermediates formed via chlorine radical/active chlorine species (HOCl/Cl 2) attack on dye compounds. Therefore, this finding may have significant technical implications for utilizing Co/PMS regent to detoxify chloride-rich azo dyes wastewater. © 2011 Elsevier B.V.

DOI 10.1016/j.jhazmat.2011.09.007
Citations Scopus - 346Web of Science - 303
2011 Wang ZH, Xie XH, Liu JS, 'Numerical modeling of potential profiles in electrical double layer of Acidithiobacillus ferrooxidans cell surface', Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals, 21 1485-1490 (2011)

The surface charge density, space charge density, surface potential (f0) and Donnan potential (fDon) on the surface of Acidithiobacillus ferrooxidans cultivated with elemental sul... [more]

The surface charge density, space charge density, surface potential (f0) and Donnan potential (fDon) on the surface of Acidithiobacillus ferrooxidans cultivated with elemental sulfur (S-A.ferrooxidans) were calculated by numerical simulation using the ion-impenetrable and ion-penetrable models. Zeta potential measurement show that the isoelectric point (IEP) of S-A.ferrooxidans is higher than that of bacterium cultured with Fe2+. It is concluded from fitting data by ionizable surface group model that S-A.ferrooxidans surface probably consists of much proteins, the ionization of amino group of which causes higher IEP (> 2). The ion-penetrable model reveals that f0 and fDon decrease rapidly at pH < 5 but hardly change when pH is 6-7. The thickness of electrical double layer of S-A.ferrooxidans is estimated as 5 nm. The electrical double layer of bacterial cell surface may have significant implications for ions transfer and nutrient transport, but their interaction is unfavorable for bacterial aggration.

Citations Scopus - 1
2011 Wang Z, Ma W, Chen C, Ji H, Zhao J, 'Probing paramagnetic species in titania-based heterogeneous photocatalysis by electron spin resonance (ESR) spectroscopy-A mini review', Chemical Engineering Journal, 170 353-362 (2011)

Many paramagnetic species such as active surface sites, reactive oxygen species (ROS) and organic radicals derived from the photodegradation of organics were involved in the heter... [more]

Many paramagnetic species such as active surface sites, reactive oxygen species (ROS) and organic radicals derived from the photodegradation of organics were involved in the heterogeneous photocatalysis. Identification and characterization of these paramagnetic species are essentially conducted using electron spin resonance (ESR) techniques, which can provide a detailed understanding of the radical composition and structure on the basis of the unique feature of g, hyperfine, and superhyperfine tensors for each kind of radicals of interest. In the present review, the basic theoretical principles of the ESR technique and its application in the field of TiO2-based heterogeneous photocatalysis are generally summarized. Two experimental approaches typical of ESR-direct monitoring of paramagnetic species or sites and spin-trapping technique have been described with particular attention to the choices of spin traps. The general features of the ESR spectra of photoinduced charges, inorganic and organic radicals in photocatalytic events are presented and discussed. In addition, some remarks will be made about the use of ESR in revealing the origin of enhanced photocatalytic activities in the mixed phase titania (P25) and visible-light-response N-doped TiO2. © 2010 Elsevier B.V.

DOI 10.1016/j.cej.2010.12.002
Citations Scopus - 192Web of Science - 180
2011 Chen X, Ma W, Li J, Wang Z, Chen C, Ji H, Zhao J, 'Photocatalytic Oxidation of Organic Pollutants Catalyzed by an Iron Complex at Biocompatible pH Values: Using O-2 as Main Oxidant in a Fenton-like Reaction', JOURNAL OF PHYSICAL CHEMISTRY C, 115 4089-4095 (2011) [C1]
DOI 10.1021/jp110277k
Citations Scopus - 38Web of Science - 37
2010 Wang Z, Chen X, Ji H, Ma W, Chen C, Zhao J, 'Photochemical cycling of iron mediated by dicarboxylates: special effect of malonate.', Environ Sci Technol, 44 263-268 (2010)
DOI 10.1021/es901956x
Citations Scopus - 43Web of Science - 40
2010 Wang Z, Xie X, Xiao S, Liu J, 'Comparative study of interaction between pyrite and cysteine by thermogravimetric and electrochemical techniques', Hydrometallurgy, 101 88-92 (2010)

Adsorption mechanism of l-cysteine on pyrite was investigated by thermogravimetric and electrochemical techniques. TG curves provided the direct evidence for chemisorption of cyst... [more]

Adsorption mechanism of l-cysteine on pyrite was investigated by thermogravimetric and electrochemical techniques. TG curves provided the direct evidence for chemisorption of cysteine on pyrite surface. Once cysteine adsorbed to pyrite surface, Ecorr (corrosion potential) sharply lowered whereas Icorr (corrosion current) increased rapidly. Pyrite became more susceptible to be oxidized even at lower potential as cysteine was added. However, the mechanism for pyrite oxidation does not fundamentally change, although cysteine can obviously accelerate oxidation rate of pyrite. These findings have important implications for understanding the mechanism of bacterial adhesion to pyrite and even metal sulfide bioleaching. © 2009 Elsevier B.V. All rights reserved.

DOI 10.1016/j.hydromet.2009.11.015
Citations Scopus - 17Web of Science - 18
2010 Wang Z, Xie X, Xiao S, Liu J, 'Adsorption behavior of glucose on pyrite surface investigated by TG, FTIR and XRD analyses', Hydrometallurgy, 102 87-90 (2010)

The interaction of glucose with pyrite has been investigated by a series of surface analyses, such as amounts adsorbed, TG, FTIR and XRD measurements. The adsorption experiment re... [more]

The interaction of glucose with pyrite has been investigated by a series of surface analyses, such as amounts adsorbed, TG, FTIR and XRD measurements. The adsorption experiment reveals that glucose would rapidly adsorb on the pyrite surface within 60 min. However, physical adhesion characterized as multi-molecular layer adsorption may occur based on adsorption isotherm type. All results obtained by TG and FTIR suggest that no adsorption took place after several times of washing. XRD results indicate that crystal structure of pyrite was not obviously destructed after glucose was added. The interplane distances of (111), (400) after interaction between glucose and pyrite were widened, which showed the similar manner with that of before interaction. All these convincing data imply that physical adsorption predominantly governs the interaction of glucose on pyrite. © 2010 Elsevier B.V. All rights reserved.

DOI 10.1016/j.hydromet.2010.01.004
Citations Scopus - 16Web of Science - 13
2009 Wang Z, Ma W, Chen C, Zhao J, 'Light-assisted decomposition of dyes over iron-bearing soil clays in the presence of H2O2', JOURNAL OF HAZARDOUS MATERIALS, 168 1246-1252 (2009)
DOI 10.1016/j.jhazmat.2009.02.160
Citations Scopus - 43Web of Science - 38
2008 Wang Z, Ma W, Chen C, Zhao J, 'Photochemical coupling reactions between Fe(III)/Fe(II), Cr(VI)/Cr(III), and polycarboxylates: Inhibitory effect of Cr species', Environmental Science and Technology, 42 7260-7266 (2008)

The roles of chromium species on photochemical cycling of iron and mineralization of polycarboxylates are examined in the presence of Cr(VI) or Cr(III) at pH 2.2-4.0. Under UV irr... [more]

The roles of chromium species on photochemical cycling of iron and mineralization of polycarboxylates are examined in the presence of Cr(VI) or Cr(III) at pH 2.2-4.0. Under UV irradiation, Cr(III) altered the redox equilibrium of iron species, leading to the shift of the photosteady state toward Fe(II). After a longer time of illumination, total organic carbon (TOC) approached a steady state in the presence of Cr(III) or Cr(VI), whereas oxalate was thoroughly mineralized in the absence of Cr species. The TOC of steady state was closely related to the kind of polycarboxylates, Cr species dosages, pH and O2 atmosphere, but hardly affected by more addition of Fe(III). ESI-MS data indicates that several Cr-oxalate complexes formed in the photochemical reactions, which are responsible for protecting oxalate against further oxidation. A mechanism is proposed for the inhibitory effect of Cr species on oxidation of oxalate and Fe(II). The present study may provide a new insight into the dual environmental effects induced by Cr contaminants especially at heavily chromium-contaminated and dissolved organic matter (DOM)-rich sites. © 2008 American Chemical Society.

DOI 10.1021/es801379j
Citations Scopus - 40Web of Science - 39
2006 Liu J-S, Wang Z-H, Chen H, Zhang Y-H, 'Interfacial electrokinetic characteristics before and after bioleaching microorganism adhesion to pyrite', TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA, 16 676-680 (2006)
DOI 10.1016/S1003-6326(06)60120-9
Citations Scopus - 14Web of Science - 8
2006 Liu J-S, Wang Z-H, Li B-M, Zhang Y-H, 'Interaction between pyrite and cysteine', TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA, 16 943-946 (2006)
DOI 10.1016/S1003-6326(06)60356-7
Citations Scopus - 14Web of Science - 14
2004 Liu JS, Xia HB, Wang ZH, 'Treatment of waste water from powder blue production with sulphur precipitation-coagulation', Zhongnan Gongye Daxue Xuebao/Journal of Central South University of Technology, 35 941-944 (2004)

Treatment of waste water raised from powder blue production was investigated in this paper. The dosage of alkali used to adjust pH was given, and the influence of NH3 on solution ... [more]

Treatment of waste water raised from powder blue production was investigated in this paper. The dosage of alkali used to adjust pH was given, and the influence of NH3 on solution chemistry was studied. The scheme of sulphur-precipitation coagulation was carried by using the waste water raised from noble metal production. The results show that when the mix is below 10:1 between waste water raised from powder blue production and from noble metal production, it's no need to add Na2S to make waste water in fit with national drainage standards; but it needs to add Na2S if the mix is above 10:1. The orthogonal experiment results show that the residual heavy metal is affected by dosage of Na2S, dosage of PFS, and pH, respectively in a descent order, and when Na2S dosage is 0.146 g/L and PFS dosage is 1.596 g/L at pH 7.0, the content of heavy metal in waste water can fit with that of national drainage standards.

Citations Scopus - 4
2004 Liu JS, Xia HB, Wang ZH, Hu YH, 'Bacterial oxidation activity in heap leaching', JOURNAL OF CENTRAL SOUTH UNIVERSITY OF TECHNOLOGY, 11 375-379 (2004)
DOI 10.1007/s11771-004-0078-2
Citations Scopus - 6Web of Science - 5
Show 96 more journal articles

Conference (1 outputs)

Year Citation Altmetrics Link
2013 Yuan R, Wang Z, Liu J, 'Application of advanced oxidation processes in treatment of high salinity organic wastewater: Kinetics and AOX formation', ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, New Orleans, LA (2013)
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Research Collaborations

The map is a representation of a researchers co-authorship with collaborators across the globe. The map displays the number of publications against a country, where there is at least one co-author based in that country. Data is sourced from the University of Newcastle research publication management system (NURO) and may not fully represent the authors complete body of work.

Country Count of Publications
China 100
Australia 31
Poland 3
Egypt 1
Hong Kong 1
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Dr Zhaohui Wang

Position

Conjoint Senior Lecturer
School of Environmental and Life Sciences
College of Engineering, Science and Environment

Contact Details

Email zhaohui.wang@newcastle.edu.au
Phone (02) 4913 8082
Links Personal Blogs
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Office

Room NIER C 132
Building NIER C.
Location Callaghan
University Drive
Callaghan, NSW 2308
Australia
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