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Nitrate-sensitized photolysis of cyanotoxin microcystin-LR: Coupling effects of HO • and RNS in redox reactions

Journal of Hazardous Materials 2025年 495卷

作者： Pengfei Ren Zilong Song Xinran Zhang Jianhua Zhou Ding Wang Xin Yang School of Environmental Science and Engineering Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology Sun Yat-sen University Guangzhou 510275 PR China Guangzhou Municipal Engineering Design & Research Institute Guangzhou 510060 PR China General Institute of Water Resources and Hydropower Planning and Design Beijing 100120 PR China

Microcystin-LR (MC-LR), a hepatotoxic cyanotoxin prevalent in eutrophic waters, poses severe health risks in drinking water. While nitrate frequently coexists with MC-LR, its role in MC-LR photodegradation remains unclear. This study demonstrates that nitrate-sensitized photolysis significantly enhances MC-LR degradation via synergistic generation of hydroxyl radicals (HO • ) and reactive nitrogen species (RNS). Compared to dark nitration, RNS-driven electrophilic attacks converted MC-LR into intermediate radicals, which synergized with HO • to cleave conjugated double bonds in the Adda side chain. A novel dealkylation/deamination pathway was identified as a key degradation mechanism. Cytotoxicity assays revealed reduced hepatotoxicity of MC-LR in Hep3B cells. Remarkably, complete removal of MC-LR (5 μg L –1 ) was achieved in nitrate-containing natural water (3.7 mg L –1 of nitrate) under 90-min sunlight irradiation, highlighting environmental relevance. These findings elucidate nitrate’s critical role in driving HO • /RNS-mediated photodegradation pathways, offering a solar-driven strategy for eliminating electron-rich contaminants. The mechanistic insights and practical efficacy underscore nitrate-sensitized photolysis as a sustainable solution for MC-LR mitigation in water treatment systems.

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Physical and Chemical Characterization of Urban Grime During Wet and Dry Season: An Impact on the No2 Uptake Coefficients and Product Compounds

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SSRN 2022年

作者： Gligorovski, Sasho Liu, Jiangping Deng, Huifan Zhang, Ruiqi Li, Xue Luo, Yongming Wang, Xinming State Key Laboratory of Organic Geochemistry Guangdong Provincial Key Laboratory of Environmental Protection and Resources Utilization Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou510 640 China Guangdong-Hong Kong-Macao Joint Laboratory for Environmental Pollution and Control Guangzhou Institute of Geochemistry Chinese Academy of Science Guangzhou510640 China Chinese Academy of Science Center for Excellence in Deep Earth Science Guangzhou510640 China University of Chinese Academy of Sciences Beijing China Faculty of Environmental Science and Engineering Kunming University of Science and Technology Kunming650500 China Institute of Mass Spectrometry and Atmospheric Environment Jinan University Guangzhou510632 China

Urban grime represents an important environmental surface for heterogeneous reactions in urban environment. Here, we assess the physical and chemical properties of urban grime collected during six consecutive months in downtown of Guangzhou, China. There is a significant variation of the uptake coefficients of NO2 on the urban grime as a function of the relative humidity (RH). In absence of water molecules (0% RH), the light-induced uptake coefficients of NO2 on urban grime samples collected during six months are very similar in order of ≈10-6. At 80% RH, depending on the sampling month the light-induced uptake coefficient of NO2 can reach one order of magnitude higher values (1.4 x 10-5, at 80% RH) compared to those uptakes at 0% RH. In presence of 80% RH, there are strong correlations between the measured NO2 uptakes and the concentrations of the water soluble carbon, soluble anions, polycyclic aromatic hydrocarbons and n-alkanes depicted in the urban grime. These correlations, demonstrate that surface adsorbed water on urban grime play an important role for the uptakes of NO2. During the heterogeneous chemistry of NO2 with urban grime, formation of unsaturated and N-containing organic compounds occur which can affect the air quality in urban environment. © 2022, The Authors. All rights reserved.

关键词： Nitrogen oxides

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Erratum to "Coupling of Sulfate Reduction and Dissolved Organic Carbon Degradation Accelerated by Microplastics in Blue Carbon Ecosystems" [Water Research, 279, (2025), 123414]

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Water research 2025年 281卷 123554页

作者： Heli Wang Yin Zhong Qian Yang Jiaying Li Dan Li Junhong Wu Sen Yang Jiashuo Liu Yirong Deng Jianzhong Song Ping'an Peng State Key Laboratory of Advanced Environmental Technology and Guangdong-Hong Kong-Maco Joint Laboratory for Environmental Pollution and Control Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China Guangdong Key Laboratory of Environmental Protection and Resources and Utilization Guangzhou 510640 China Guangdong Key Laboratory of Contaminated Sites Environmental Management and Remediation Guangdong Provincial Academy of Environmental Science Guangzhou 510045 China 523808 China. Guangdong Key Laboratory of Environmental Protection and Resources and Utilization Guangzhou 510640 China. University of Chinese Academy of Sciences Beijing 100049 China. School of Environment and Civil Engineering Dongguan University of Technology Dongguan.

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Modeling and process design of municipal solid waste pyrolysis and gasification with a fixed-bed chamber

Modeling and process design of municipal solid waste pyrolys...

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作者： Li Erping Hu Qing Chen Haoyun Cai Jinling Qiu Yaqun Yu Zhiyuan Hunan Research Academy of Environmental Sciences (Hunan Provincial Key Laboratory of Water Pollution Control Technology) Hunan Research Academy of Environmental Sciences ?(Hunan Provincial Key Laboratory of Water Pollution Control Technology) Central South University of Forestry and Technology

To design the process of municipal solid waste(MSW) pyrolysis and gasification in a fixed-bed more veritably and effectively, the modeling of this process was proposed based on Gibbs energy minimization by using the Aspen plus software. The proposed model was used to predict and analyze the influences of operating parameters including gasification temperature,air-fuel ratio and steam/MSW ratio on the composition, lower heating value(LHV), carbon conversion efficiency(CCE), heat conversion efficiency(HCE)and flammable gas contents(FGC) of syngas. The results indicate that there is a good agreement between the experimental data and the simulated data obtained using this model. The predicted appropriate gasification temperature was around 900℃ while the suitable air-fuel ratio was approximately 0.4, and the beast steam/MSW ratio was around 0.4. A novel configuration of atmospheric fixed-bed chamber is designed for the municipal solid waste pyrolysis and gasification process based on the experimental and simulated results. The designed configuration was feasible with achieved heat balance of the system.

关键词： MSW Gibbs Modeling and process design of municipal solid waste pyrolysis and gasification with a fixed-bed chamber

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Insights into ROL-driven and ROS-mediated metalloid oxidation and sequestration in the soil-rice iron barrier system

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Journal of hazardous materials 2025年 494卷 138718页

作者： Jing-Min Yang Xin Wang Dong-Xing Guan Rui Huang Xiong-Hui Ji Yun-He Xie Bo Peng Qin-Bo Qin School of Geographical Sciences Hunan Normal University Changsha 410081 China Institute of Interdisciplinary Studies Hunan Normal University Changsha 410081 China. Institute of Interdisciplinary Studies Hunan Normal University Changsha 410081 China. Electronic address: wangxin@***. State Key Laboratory of Soil Pollution Control and Safety Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment Institute of Soil and Water Resources and Environmental Science College of Environmental and Resource Sciences Zhejiang University Hangzhou 310058 China. Electronic address: dxguan@***. Longping Branch College of Biology Hunan University Changsha 410125 China Key Laboratory of Agro-Environment in Midstream of Yangtze Plain Ministry of Agriculture and Rural Affairs Hunan Cultivated Land and Agricultural Eco-Environment Institute Hunan Academy of Agricultural Sciences Changsha 410125 China. Institute of Interdisciplinary Studies Hunan Normal University Changsha 410081 China College of Life Sciences Hunan Normal University Changsha 410081 China.

This study investigated how reactive oxygen species (ROS) mediated by radial oxygen loss (ROL) function in arsenic (As) remediation through soil-rice iron barriers. Using high- and low-ROL rice varieties combined with zero-valent iron (ZVI) and steel slag amendments, As transformation pathways at soil-root interfaces were examined. ZVI increased soil amorphous Fe content by 22.8 %-49.3 % and iron plaque Fe by 59.9 %, while steel slag increased iron plaque weakly crystalline Fe by 62.4 %. Despite higher ROL, minimal As(III) oxidation occurred in rhizosphere compared to bulk soil due to counteracting effects of Fe(III)-reducing bacterial activity. However, substantial oxidation occurred on root surfaces, with As(V)/total As proportion reaching 59.3 %-74.3 %, attributed to hydroxyl radical accumulation driven by iron plaque thickening and amorphous Fe enrichment. In situ visualization using ROS-capturing membranes confirmed strong ROS accumulation specifically at root surfaces with negligible signals in surrounding soil. Path analysis established a positive relationship between hydroxyl radical production and As(V) proportion at iron plaque interfaces (path coefficient = 0.74, p < 0.01), which indirectly reduced grain inorganic As. These findings elucidate the critical role of localized ROS processes in As immobilization and provide a mechanistic foundation for developing effective rhizosphere-targeted remediation strategies in contaminated paddy systems.

关键词： Arsenic Iron barriers Paddy soil Radial oxygen loss (ROL) Reactive oxygen species (ROS)

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Hydrochemistry and isotope geochemistry of Bailing geothermal water in northwest Jiangxi: Implications for water-rock interaction

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Geothermics 2025年 131卷

作者： Xinghua Shi Ximin Bai Zhanxue Sun Jinhui Liu Hailong Ye Longlong Pang Gongxin Chen Haohao Yan State Key Laboratory of Nuclear Resources and Environment East China University of Technology Nanchang 330013 PR China School of Water Resources &Environmental Engineering East China University of Technology Nanchang 330013 PR China Jiangxi Provincial Key Laboratory of Genesis and Remediation of Groundwater Pollution East China University of Technology Nanchang 330013 PR China Hydrogeological Brigade of Jiangxi Geological Bureau Nanchang 330224 PR China Jiangxi Institute of Survey & Design LTD. Nanchang 330224 PR China School of Geophysics and Measurement-control Technology East China University of Technology Nanchang 330013 PR China

Geothermal energy development and utilization can contribute to the achievement of China's dual carbon goals and energy security. Bailing area in northwest Jiangxi province is abundant of geothermal manifestations like hot springs and geothermal wells. However, due to the limited understanding of the genetic mechanism of these geothermal resources, the utilization efficiency of these geothermal waters is not sufficient at present. In this study, the hydrochemcial characteristics and water-rock interaction process of geothermal waters of 3 typical hot springs and 3 geothermal wells in Bailing area were researched by using hydrogeochemistry, isotope geochemistry, multi-mineral equilibrium simulation and silicon enthalpy graphic method. The results show that the geothermal waters in Bailing area are HCO 3 -Na type weakly alkaline silicon-fluorine water with temperature 32.7–85 °C, pH 8.27–8.82, H 2 SiO 3 77.74–115.36 mg/L and F - 3.74–5.47 mg/L. These geothermal waters have experienced a very strong water-rock interaction process, isotope and ion exchanges, resulting in the enrichment of ion component and trace elements (such as Al, B, Li, Sc, Ti, V, W, Rb, Ga, Mo, Cs and U). Geothermal waters originate from atmospheric precipitation with the recharge elevation varying from 243 m to 1455 m, and then infiltrated to depth about 4–5 Km to be heated along weathering fissures and secondary faults. The radioactive heat generation of granites provided the heat source and the reservoir temperature determined by quartz geothermometer ranges from 109.9 to 130.6 °C. After undergoing a deep circulation of 2483 to 3034 years, these geothermal waters emerged on the surface along the northeast-trending fault to form hot springs, and mixed with cold water (mixing ratio: 21 %-67 %) during the rising process. ‌This research is helpful to provide a more comprehensive understanding of the origin, circulation and evolution of geothermal waters in Bailing area.

关键词： Geothermal water Hydrochemistry Isotope Northwest Jiangxi Water-rock interaction

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Oxygen Doping Cooperated with Co-N-Fe Dual-Catalytic Sites: Synergistic Mechanism for Catalytic Water Purification within Nanoconfined Membrane

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Advanced materials (Deerfield Beach, Fla.) 2024年第30期36卷 e2404278页

作者： Ziwei Wang Zhigang Yi Lok Wing Wong Xiang Tang Hou Wang Han Wang Chengyun Zhou Yangzhuo He Weiping Xiong Guangfu Wang Guangming Zeng Jiong Zhao Piao Xu College of Environmental Science and Engineering Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Ministry of Education) Hunan University Changsha 410082 P. R. China. Department of Applied Physics The Hong Kong Polytechnic University Kowloon 999077 China. Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation College of Resources and Environment Fujian Agriculture and Forestry University Fuzhou 350002 P. R. China. School of Metallurgy and Environment Central South University Changsha Hunan 410083 China.

Atom-site catalysts, especially for graphitic carbon nitride-based catalysts, represents one of the most promising candidates in catalysis membrane for water decontamination. However, unravelling the intricate relationships between synthesis-structure-properties remains a great challenge. This study addresses the impacts of coordination environment and structure units of metal central sites based on Mantel test, correlation analysis, and evolution of metal central sites. An optimized unconventional oxygen doping cooperated with Co-N-Fe dual-sites (OCN Co/Fe) exhibits synergistic mechanism for efficient peroxymonosulfate activation, which benefits from a significant increase in charge density at the active sites and the regulation in the natural population of orbitals, leading to selective generation of SO . Building upon these findings, the OCN-Co/Fe/PVDF composite membrane demonstrates a 33 min ciprofloxacin (CIP) rejection efficiency and maintains over 96% CIP removal efficiency (over 24 h) with an average permeance of 130.95 L m h. This work offers a fundamental guide for elucidating the definitive origin of catalytic performance in advance oxidation process to facilitate the rational design of separation catalysis membrane with improved performance and enhanced stability.

关键词： catalysis membrane coordination environment modulation dual‐atom catalysts graphitic carbon nitride peroxymonosulfate

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Synergy from the Stepped Hollow FeHCFe Nanocubes and the Dimorphic Polypyrrole for High-Performance Electrochemical Water Desalination

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Angewandte Chemie 2025年

作者： Yu Liu Kunyue Luo Prof. Wenle Xing Wenjun Yin Jing Feng Shuaishuai Pi Zixiao Kang Prof. Jie Liang Prof. Lin Tang Prof. Wangwang Tang College of Environmental Science and Engineering and Key Laboratory of Environmental Biology and Pollution Control (Ministry of Education) Hunan University Changsha 410082 China These authors contribute equally to this article. School of Resources and Environment Hunan University of Technology and Business Changsha 410205 China PowerChina Zhongnan Engineering Corporation Limited Changsha 410014 China CCCC Third Harbor Consultants Co. Ltd. Shanghai 200032 China

Saline water desalination serves as an important route to increase freshwater supply, while capacitive deionization (CDI) has emerged as a promising technique to tackle this issue. To boost the successful application of CDI, development of advanced electrode materials is vital. Herein, we innovatively designed and synthesized a sophisticated Prussian blue/dimorphic polypyrrole composite for the hybrid CDI (HCDI). Specifically, the nanoparticle-like polypyrrole (PPy) in situ distributed on the surface of stepped hollow FeHCFe nanocubes, while the coexisting nanotube-like PPy interconnected the discrete stepped hollow FeHCFe nanocubes. The introduction of PPy nanoparticles/nanotubes promoted both electron and ion dynamics, and improved the electrochemical activity of FeHCFe. Meanwhile, the FeHCFe nanocubes with concave stepwise architecture on each side offered large accessible contact area for electrolyte, reduced Na + migration path, improved tolerance for lattice expansion, and optimized redox sites for Na + storage. Through such unique structural design and synergistic combination, the FeHCFe/PPy with appropriate component ratio achieved a remarkable desalination capacity and a fast desalination rate along with excellent cycling performance, outperforming other related materials. Moreover, the treated solution can meet the drinking water standard within 6 min via the use of six tandem HCDI cells. Density functional theory (DFT) revealed the mechanism of Na + capture process and provided a fundamental understanding of the rapid Na + migration and large Na + storage capability. This study provides insights into ration design of superior electrode materials for high-performance electrochemical water desalination.

关键词： water desalination capacitive deionization polypyrrole nanoparticles and nanotubes stepped hollow prussian blue synergistic effect

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Study on the influence of Fe(III) precipitation on the pH adjustment of vanadium-containing acid leaching solution by monovalent selective electrodialysis coupled with raffinate

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Colloids and Surfaces A: Physicochemical and Engineering Aspects 2025年 723卷

作者： Yuting Wang Yimin Zhang Qiushi Zheng Nannan Xue School of Resource and Environmental Engineering Wuhan University of Science and Technology Wuhan Hubei 430081 China State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control Wuhan University of Science and Technology Wuhan Hubei 430081 China Collaborative Innovation Center of Strategic Vanadium Resources Utilization Wuhan University of Science and Technology Wuhan Hubei 430081 China Hubei Provincial Engineering Technology Research Center of High Efficient Cleaning Utilization for Shale Vanadium Resource Wuhan University of Science and Technology Wuhan Hubei 430081 China

This study, for the first time, integrates monovalent selective electrodialysis with raffinate recycling to regulate the pH of vanadium-containing acid leaching solutions. This study reveals the precipitation formation mechanism of Fe(III) during the pH adjustment of vanadium-containing acid leaching solution through MSED, as well as the influence mechanism of the precipitate on the membrane stack. The results show that the optimal pretreatment conditions are to add 6 g/L of NaH 2 PO 2 ·H 2 O and fully stir the reaction at 90 °C for 2 h. The optimal conditions for MSED are a current density of 20 mA/cm 2 and a feed solution flow rate of 50 L/h. Under the optimum conditions, the energy consumption is 0.071 kW·h/(mol H + ), the recovery efficiency of H + is 80.29 %, the treatment time is 1.93 h, and the vanadium retention rate is 97.34 %. It was demonstrated that NaH 2 PO 2 , as a reducing agent for vanadium-containing acid leaching solution, not only features a high reduction rate but also can utilize the excessive PO 4 3- to form soluble coordination compounds with Fe 3+ , thereby further suppressing the formation of precipitates. This study addressed the crucial limitations in the membrane-based pH adjustment process and provided a reference for the green upgrading of vanadium extraction by hydrometallurgy.

关键词： Monovalent selective electrodialysis Raffinate Vanadium Iron ion Precipitation Acid leaching solution

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Boosted Photocatalytic Degradation of Ciprofloxacin by Interfacial Charge Transfer of NiO/ZnO p-n Heterojunction and Coal Gangue Composite Catalyst

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Journal of Alloys and Compounds 2025年

作者： Qi Xu Xin Liu Jinxiong Wu Yazhou Jiao Yan Yan Xinru Li Yunxia Hu Bekchanov Davronbek Xintai Su Key Laboratory of Pollutant Chemistry and Environmental Treatment School of Chemistry and Chemical Engineering Yili Normal University Yining 835000 China Xinjiang Key Laboratory of Clean Conversion and High Value Utilization of Biomass Resources School of Chemistry and Chemical Engineering Yili Normal University Yining 835000 China Department of Polymer Chemistry National University of Uzbekistan Tashkent 100174 Uzbekistan Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling School of Environment and Energy South China University of Technology Guangzhou Guangdong 510006 China

Antibiotics have inflicted significant damage on ecosystems and human health due to their resistance to biodegradation, potent bacteriostatic properties, and propensity for bioaccumulation. Consequently, the comprehensive management of antibiotics has emerged as a widely recognized concern. In this research, we developed a novel composite catalyst, CG-ZnO/NiO-x, by integrating the boiling reflux method with high-temperature pyrolysis, utilizing coal gangue (CG) as the support material. The degradation efficiency of ciprofloxacin (CIP) achieved 95.65% after 1 h of irradiation with a 0.5 kW mercury lamp under (0.6 g·L -1 of CG-ZnO/NiO-2, 10 mg·L -1 of CIP, pH=7.0). Characterization of the CG-ZnO/NiO-x composite catalyst through X-ray photoelectron spectroscopy (XPS), valence band spectrum and UV-visible diffuse reflectance spectroscopy (UV-vis-DRS) revealed there are heterojunction interfaces between ZnO and NiO. The heterojunction facilitated the transfer of interfacial charges and enhanced light absorption, and the incorporation of CG stimulated the activity of the catalyst. Furthermore, density functional theory (DFT) calculations identified oxygen (O) and nickel (Ni) as the primary sites contributing to the heterojunction's charge carriers. This work will provide theoretical basis for the resource utilization of solid waste and the construction of high value-added catalyst based on CG.

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