The overlooked role of Cr(VI) in micropollutant degradation under solar light irradiation

Article Engineering, Environmental

Solar irradiation accelerates the oxidation of Cr(III) by 8-manganese dioxide

Xing Sun et al.

Summary: We investigated the photochemical reaction between Cr(OH)3 and 8-MnO2 under simulated solar irradiation. The results showed that 8-MnO2 can accelerate the oxidation of Cr(OH)3 and hydroxyl radicals (center dot OH) are the main oxidants.

JOURNAL OF HAZARDOUS MATERIALS (2023)

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Article Engineering, Environmental

Generation of hydroxyl radicals via activation of Cr(VI) by UVA-LED for rapid decontamination: The important role of Cr(V)

Cui Huang et al.

Summary: Hexavalent chromium (Cr(VI)) was efficiently removed by activation with ultraviolet-A light-emitting diode (UVA-LED), degrading various pollutants. The generation of hydroxyl radicals (HO•) and pentavalent chromium (Cr(V)) in the UVA-LED/Cr(VI) system was confirmed. Hydroxyl radicals were identified as the dominant reactive species, aiding in the removal of pollutants in chromium-containing wastewater.

JOURNAL OF HAZARDOUS MATERIALS (2023)

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Article Engineering, Environmental

Novel solar/sulfite advanced oxidation process for carbamazepine degradation: Radical chemistry, transformation pathways, influence on disinfection byproducts and toxic changes

Han Chen et al.

Summary: Advanced oxidation processes (AOPs) play a significant role in eliminating persistent micro-contaminants in water. In this study, a solar/sulfite process was developed to degrade carbamazepine (CBZ) and showed effectiveness in CBZ elimination. The generated sulfate and hydroxyl radicals contributed to the degradation of CBZ, and the process pH and the presence of certain substances affected the degradation efficiency. The study also identified major degradation intermediates of CBZ and proposed a transformation pathway. Furthermore, the solar/sulfite pretreatment reduced the formation of disinfection byproducts during subsequent chlorination, demonstrating its potential in controlling water contamination.

CHEMICAL ENGINEERING JOURNAL (2023)

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Article Chemistry, Physical

Microenvironment modulation of cobalt single-atom catalysts for boosting both radical oxidation and electron-transfer process in Fenton-like system

Kexin Yin et al.

Summary: Two coordination structures (Co-N4 or Co-N3) of cobalt single-atom catalysts (Co-SACs) were prepared using chitosan as a starting precursor to evaluate their effect on organic degradation. The performance of degrading carbamazepine (CBZ) and the radical/nonradical pathways in Co-N4/PMS and Co-N3/PMS systems were evaluated. Results showed that the Co-N3 catalyst produced more radicals due to stronger PMS adsorption and subsequent peroxide bond cleavage of PMS. The Co-N3 coordination also enhanced the electron-transfer process for CBZ. This study provides insights into the versatile catalytic pathways of carbon-based SACs for high-efficiency PMS activation.

APPLIED CATALYSIS B-ENVIRONMENTAL (2023)

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Article Engineering, Environmental

UVA-LED-Assisted Activation of the Ferrate(VI) Process for Enhanced Micropollutant Degradation: Important Role of Ferrate(IV) and Ferrate(V)

Tao Yang et al.

Summary: This study investigated the use of UVA-LED in combination with Fe(VI) for degrading micropollutants, showing significant enhancement compared to Fe(VI) alone. Factors such as wavelength, light intensity, and pH were found to influence the degradation performance.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2022)

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Article Engineering, Environmental

Natural source of Cr(VI) in soil: The anoxic oxidation of Cr(III) by Mn oxides

Ming Ao et al.

Summary: Cr(VI) in soils and groundwater is primarily derived from the oxidation of geogenic Cr(III) minerals rather than direct emissions. The oxidation of Cr(III) is mainly facilitated by Mn oxides in anoxic soils and by O-2 in oxic soils. The presence of Mn oxides promotes the oxidative dissolution of chromite even under anoxic conditions. The form of Cr, the abundance of Mn oxides, and the presence of reducing agents control the content of Cr(VI) in soil.

JOURNAL OF HAZARDOUS MATERIALS (2022)

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Article Engineering, Environmental

Novel solar-driven ferrate(VI) activation system for micropollutant degradation: Elucidating the role of Fe(IV) and Fe(V)

Jiamin Mai et al.

Summary: This paper presents a novel process using solar-ferrate(VI) for efficient degradation of micropollutants. The study found that Fe(V) and Fe(IV), rather than reactive oxygen species, played a significant role in the process. The researchers also elucidated the reaction mechanism of Fe(VI) and its degradation of micropollutants. Additionally, the study investigated the effect of pH and various ions on the degradation process. The solar-ferrate(VI) process demonstrated excellent applicability under different irradiation conditions.

JOURNAL OF HAZARDOUS MATERIALS (2022)

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Article Engineering, Environmental

Enhanced Permanganate Activation under UVA-LED Irradiation: Unraveled Mechanism Involving Manganese Species and Hydroxyl Radical

Tao Yang et al.

Summary: This study introduced UVA-LED photolysis of Mn(VII) for degrading micropollutants and found that factors like light intensity, radiation wavelengths, pH, and water constituents affect the degradation rates of DCF and 4-CP. RMnS play a significant role in the degradation process.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2022)

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Article Engineering, Environmental

Humic acid induced indirect photolysis of polybrominated diphenyl ethers under visible light irradiation

Meiying Yang et al.

Summary: This study investigates the indirect photolysis and debromination of the organic brominated pollutant decabromodiphenyl ether (BDE209) under visible light irradiation in the presence of humic acid (HA). The results show that HA induces electron transfer and facilitates the activation of C-Br bond via halogen bonds, resulting in the preferential cleavage of meta-C-Br bond. Furthermore, carboxyl group is identified as the key functional group capable of providing oxygen terminals to form halogen bonds.

JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING (2022)

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Article Engineering, Environmental

Enhanced oxidation of carbamazepine by UV-LED/persulfate and UV-LED/H2O2 processes in the presence of trace copper ions

Anhong Cai et al.

Summary: The study compared the degradation of CBZ using UV-LED/PS and UV-LED/H2O2 processes with trace Cu2+ at neutral pH. The presence of trace Cu2+ accelerated CBZ degradation, with UV-LED/PS process showing better performance. The addition of Cu2+ had a more significant effect at low levels in both processes at neutral pH. The degradation was mainly contributed by (OH)-O-center dot in the pH range of 3.1-7.2.

CHEMICAL ENGINEERING JOURNAL (2021)

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Article Engineering, Environmental

Evaluation of the concentration and contribution of superoxide radical for micropollutant abatement during ozonation

Yang Guo et al.

Summary: During ozonation, the concentrations ratios of hydroxyl radicals, superoxide radicals and ozone remain constant, indicating the potential non-negligible role of superoxide radicals in the degradation of certain micropollutants with similar or higher reactivity compared to hydroxyl radicals. The proposed chemical kinetic model accurately simulates the abatement efficiencies of ozone-resistant micropollutants by considering the contribution of superoxide radicals, providing a valuable tool for predicting micropollutant removal during ozonation.

WATER RESEARCH (2021)

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Article Engineering, Environmental

Synergistic effects of UVC and oxidants (PS vs. Chlorine) on carbamazepine attenuation: Mechanism, pathways, DBPs yield and toxicity assessment

Mengyuan Xu et al.

Summary: The study investigated the efficiency of UV oxidation and chlorine oxidation processes on the treatment of carbamazepine in water, with both methods showing good removal of CBZ. However, the reaction mechanisms differed under different conditions.

CHEMICAL ENGINEERING JOURNAL (2021)

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Article Environmental Sciences

The role of carbonate radicals on the kinetics, radical chemistry, and energy requirement of UV/chlorine and UV/H2O2 processes

Shumin Zhu et al.

Summary: Quantitative insight into HCO3--dependent degradation kinetics is essential for understanding UV processes. A kinetic model was developed to predict kinetics in UV/H2O2 and UV/chlorine processes. The presence of bicarbonate (HCO3-) impacts CBZ degradation and radical chemistry in UV processes, with HCO3- inhibiting CBZ degradation to different degrees. HO center dot and CO3-center dot make comparable contributions to CBZ degradation in UV/H2O2 process in the presence of HCO3-, while ClO center dot is the main contributor at various HCO3- concentrations. Overall, HCO3- and CO3-center dot have a higher impact on the reactions and mechanism of UV/H2O2 processes.

CHEMOSPHERE (2021)

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Article Engineering, Environmental

Mechanistic Investigation of Enhanced Photoreactivity of Dissolved Organic Matter after Chlorination

Dong Wan et al.

Summary: The study found that chlorine disinfection significantly reduces the aromaticity, electron-donating capacity, and average molecular weight of DOM, leading to an increase in the photoproduction activity of DOM after chlorination. The quantum yields of reactive species produced by chlorinated DOM under sunlight irradiation are positively correlated with the absorbance ratio and negatively correlated with the electron-donating capacity. Overall, chlorine disinfection has a synergistic effect on the photosensitization of DOM, which aids in the removal of trace pollutants in surface waters.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2021)

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Article Engineering, Environmental

Insight into enhanced activation of permanganate under simulated solar irradiation: Rapid formation of manganese species

Tao Yang et al.

Summary: Utilizing simulated solar activation of permanganate can lead to rapid degradation of micropollutants, with the efficiency of degradation depending on the reactive manganese species involved. The presence of common constituents also influences the process, highlighting the complexity of micropollutant degradation in water treatment.

WATER RESEARCH (2021)

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Article Engineering, Environmental

Insights into the Oxidation of Organic Cocontaminants during Cr(VI) Reduction by Sulfite: The Overlooked Significance of Cr(V)

Hongyu Dong et al.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2020)

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Review Engineering, Environmental

Persulfate-Based Advanced Oxidation: Critical Assessment of Opportunities and Roadblocks

Jaesang Lee et al.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2020)

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Review Engineering, Environmental

Recent developments and challenges in practical application of visible-light-driven TiO2-based heterojunctions for PPCP degradation: A critical review

Ashutosh Kumar et al.

WATER RESEARCH (2020)

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Article Engineering, Environmental

Degradation difference of ofloxacin and levofloxacin by UV/H2O2 and UV/PS (persulfate): Efficiency, factors and mechanism

Xiaohui Liu et al.

CHEMICAL ENGINEERING JOURNAL (2020)

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Article Engineering, Environmental

Production of Reactive Oxygen Species by the Reaction of Periodate and Hydroxylamine for Rapid Removal of Organic Pollutants and Waterborne Bacteria

Hongwei Sun et al.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2020)

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Article Environmental Sciences

Are free radicals actually responsible for enhanced oxidation of contaminants by Cr(VI) in the presence of bisulfite?

Yuan Gao et al.

CHEMOSPHERE (2020)

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Article Engineering, Environmental

Different Pathways for Cr(III) Oxidation: Implications for Cr(VI) Reoccurrence in Reduced Chromite Ore Processing Residue

Weizhen Liu et al.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2020)

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Article Engineering, Environmental

PPCP degradation and DBP formation in the solar/free chlorine system: Effects of pH and dissolved oxygen

Zhechao Hua et al.

WATER RESEARCH (2019)

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Article Engineering, Environmental

The Role of Reactive Nitrogen Species in Sensitized Photolysis of Wastewater-Derived Trace Organic Contaminants

Rachel C. Scholes et al.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2019)

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Article Engineering, Environmental

Degradation of carbamazepine by vacuum-UV oxidation process: Kinetics modeling and energy efficiency

Shumin Zhu et al.

JOURNAL OF HAZARDOUS MATERIALS (2019)

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Article Engineering, Environmental

Photochemical production of hydroxyl radical from algal organic matter

Xi-Zhi Niu et al.

WATER RESEARCH (2019)

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Article Engineering, Environmental

Adsorption and reduction of chromium(VI) from aqueous solution using polypyrrole/calcium rectorite composite adsorbent

Yaolei Xu et al.

WATER RESEARCH (2019)

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Article Engineering, Environmental

Heterogeneous activation of peroxymonosulfate by sillenite Bi25FeO40: Singlet oxygen generation and degradation for aquatic levofloxacin

Yang Liu et al.

CHEMICAL ENGINEERING JOURNAL (2018)

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Article Engineering, Environmental

Copper Inhibition of Triplet-Induced Reactions Involving Natural Organic Matter

Yanheng Pan et al.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2018)

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Article Engineering, Environmental

Ultraviolet Irradiation of Permanganate Enhanced the Oxidation of Micropollutants by Producing HO• and Reactive Manganese Species

Kaiheng Guo et al.

ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS (2018)

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Article Engineering, Environmental

Effects of HCO3- on Degradation of Toxic Contaminants of Emerging Concern by UV/NO3-

Ying Huang et al.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2018)

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Review Environmental Sciences

Studies on photodegradation process of psychotropic drugs: a review

Jakub Trawinski et al.

ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH (2017)

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Article Engineering, Environmental

Quantum Yield of Nitrite from the Photolysis of Aqueous Nitrate above 300 nm

Katherine B. Benedict et al.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2017)

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Article Engineering, Environmental

Photolysis and UV/H2O2 of diclofenac, sulfamethoxazole, carbamazepine, and trimethoprim: Identification of their major degradation products by ESI-LC-MS and assessment of the toxicity of reaction mixtures

Sultan K. Alharbi et al.

PROCESS SAFETY AND ENVIRONMENTAL PROTECTION (2017)

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Article Engineering, Environmental

UV/chlorine treatment of carbamazepine: Transformation products and their formation kinetics

Yanheng Pan et al.

WATER RESEARCH (2017)

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Article Engineering, Environmental

A simple Cr(VI)-S(IV)-O2 system for rapid and simultaneous reduction of Cr(VI) and oxidative degradation of organic pollutants

Yanan Yuan et al.

JOURNAL OF HAZARDOUS MATERIALS (2016)

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Article Engineering, Environmental

Comparative evaluation of iodoacids removal by UV/persulfate and UV/H2O2 processes

Yongjun Xiao et al.

WATER RESEARCH (2016)

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Article Engineering, Environmental

Synergetic Transformations of Multiple Pollutants Driven by Cr(VI)-Sulfite Reactions

Bo Jiang et al.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2015)

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Article Chemistry, Inorganic & Nuclear

Photochemistry of the Permanganate Ion in Low-Temperature Frozen Matrices

Wyatt A. Thornley et al.

INORGANIC CHEMISTRY (2015)

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Article Engineering, Environmental

Kinetic and mechanism investigation on the photochemical degradation of atrazine with activated H2O2, S2O82- and HSO5-

Javed Ali Khan et al.

CHEMICAL ENGINEERING JOURNAL (2014)

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Article Engineering, Environmental

Cr(OH)3(s) Oxidation Induced by Surface Catalyzed Mn(II) Oxidation

Seonyi Namgung et al.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2014)

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Article Engineering, Environmental

The Roles of Reactive Species in Micropollutant Degradation in the UV/Free Chlorine System

Jingyun Fang et al.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2014)

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Article Engineering, Environmental

Common Occurrence of a Positive δ53Cr Shift in Central European Waters Contaminated by Geogenic/Industrial Chromium Relative to Source Values

Martin Novak et al.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2014)

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Article Environmental Sciences

The effects of the psychiatric drug carbamazepine on freshwater invertebrate communities and ecosystem dynamics

Amanda L. Jarvis et al.

SCIENCE OF THE TOTAL ENVIRONMENT (2014)

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Article Engineering, Environmental

Simultaneous Redox Conversion of Chromium(VI) and Arsenic(III) under Acidic Conditions

Zhaohui Wang et al.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2013)

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Article Engineering, Environmental

Efficient removal of endosulfan from aqueous solution by UV-C/peroxides: A comparative study

Noor S. Shah et al.

JOURNAL OF HAZARDOUS MATERIALS (2013)

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Article Chemistry, Analytical

Oxidation of CrIII to CrVI during chlorination of drinking water

Dana R. Lindsay et al.

JOURNAL OF ENVIRONMENTAL MONITORING (2012)

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Article Environmental Sciences

The role of nitrite and nitrate ions as photosensitizers in the phototransformation of phenolic compounds in seawater

P. Calza et al.

SCIENCE OF THE TOTAL ENVIRONMENT (2012)

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Review Chemistry, Medicinal

Chromium in Drinking Water: Sources, Metabolism, and Cancer Risks

Anatoly Zhitkovich

CHEMICAL RESEARCH IN TOXICOLOGY (2011)

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Article Engineering, Environmental

Chromate-Induced Activation of Hydrogen Peroxide for Oxidative Degradation of Aqueous Organic Pollutants

Alok D. Bokare et al.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2010)

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Article Engineering, Environmental

Indirect Photodegradation of Amine Drugs in Aqueous Solution under Simulated Sunlight

Yong Chen et al.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2009)

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Article Multidisciplinary Sciences

Genesis of hexavalent chromium from natural sources in soil and groundwater

Christopher Oze et al.

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA (2007)

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Article Environmental Sciences

Photo-induced degradation of diuron in aqueous solution by nitrites and nitrates: Kinetics and pathways

M. V. Shankar et al.

CHEMOSPHERE (2007)

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Article Engineering, Environmental

Extent of oxidation of Cr(III) to Cr(VI) under various conditions pertaining to natural environment

AD Apte et al.

JOURNAL OF HAZARDOUS MATERIALS (2006)

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Article Engineering, Environmental

Pyrite oxidation by hexavalent chromium: Investigation of the chemical processes by monitoring of aqueous metal species

F Demoisson et al.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2005)

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Article Environmental Sciences

Ageing of chromium(III)-bearing slag and its relation to the atmospheric oxidation of solid chromium(III)-oxide in the presence of calcium oxide

K Pillay et al.

CHEMOSPHERE (2003)

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The overlooked role of Cr(VI) in micropollutant degradation under solar light irradiation

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