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Insight into Enhanced Bromate Photo-Reduction Over Magnetically Recyclable Fe3o4/Tio2/Bi Composites Under Uv Light Irradiation: Performance, Mechanism and Applications

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SSRN 2023年

作者： Xu, Ying Ji, Xingli Li, Lei Li, Ping Zhang, Wei Yu, Shuili State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and Engineering Tongji University Shanghai200092 China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092 China

Research on bromate (BrO3-) removal from drinking water has received much attention recently due to its carcinogenic and genotoxicity. In this study, magnetic Fe3O4/TiO2/Bi composites were synthesized by a simple one-pot solvothermal method to degrade BrO3-. Results showed that over 99% of BrO3- could be removed with a 0.2 g/L dosage of Fe3O4/TiO2/Bi-5% composite in 20 min under UV irradiation at an intensity of 2.3 mW/cm-2 and pH of 7.0 and its removal rate (k = 0.214 min–1) was 13.7 times higher than that of pure TiO2 (k = 0.0156 min–1). On the one hand, adding Fe3O4 particles increased the electrical conductivity of the composites and provided a possible way to recover the composites by magnetic attraction. On the other hand, the loading of bismuth (Bi) enhanced the light absorption of the composite. In addition, Bi acted as hole trapping centers to improve the efficiency of carrier separation and consumed holes by oxidizing Bi0 to Bi3+, thus avoiding the use of hole sacrificial agents. The strong photocatalytic activity was well maintained after the fifth cyclic treatment, indicating both good recoverability and high performance of the novel composites. The efficiency of BrO3- removal in tap water was less than that in deionized (DI) water, mainly due to the consumption of photo-generated electrons by coexisting ions and the adsorption of natural organic matter (NOM) on composites. The enhanced photocatalytic activity and magnetic recyclability made Fe3O4/TiO2/Bi composites a promising candidate for BrO3- removal in drinking water. © 2023, The Authors. All rights reserved.

关键词： Titanium dioxide

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Evaluation of Best Management Practices for Mitigating Harmful Algal Blooms Risk in an Agricultural Lake Basin Using a Watershed Model Integrated with Bayesian Network Approach

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SSRN 2024年

作者： Liu, Dingwu Huang, Lei Jia, Ling Wang, Peng Faculty of Civil Engineering and Mechanics Jiangsu University Zhenjiang212013 China State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China

Lake eutrophication caused by nitrogen and phosphorus has led to frequent harmful algal blooms (HABs), especially under the unknown challenges of climate change, which have seriously damaged human life and property. In this study, a Bayesian Network (BN)-SWAT+ model framework was constructed to elucidate the mechanisms between non-point source nitrogen pollution in agricultural lake watersheds and algal activities. A typical agricultural shallow lake basin, the Taihu Basin (TB), China, was chosen in this study, aiming to investigate the effectiveness of best management practices (BMPs) in controlling HABs risks in TB. By modeling total nitrogen concentration of Taihu Lake from 2007-2022 with four BMPs (filter strips, grassed waterway, fertilizer application reduction and no-till agriculture), the results indicated that fertilizer application reduction proved to be the most effective BMP with 0.107 of Harmful Algal Blooms Probability Reduction (HABs-PR) when reducing 40% of fertilizer, followed by filter strips with 0.01 of HABs-PR when 4815ha of filter strips were conducted, while grassed waterway and no-till agriculture showed no significant effect on preventing HABs. Furthermore, the combined practice between 40% fertilizer application reduction and 4815ha filter strips construction showed synergistic effects with HABs-PR increasing to 0.140. Precipitation and temperature data were distorted to model scenarios of extreme events. As a result, the combined approach outperformed any single BMP in terms of robustness under extreme climates. This research provides a watershed-level perspective on HABs risks mitigation and highlights the strategies to address HABs under the influence of climate change. © 2024, The Authors. All rights reserved.

关键词： Climate change

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Diffusion of "Dual Carbon" Policies Among Chinese Cities: A Network Evolution Analysis

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SSRN 2024年

作者： Wang, Jiaming Jia, Ling Wang, Yiyi Wang, Peng Huang, Lei State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China Faculty of Civil Engineering and Mechanics Jiangsu University Zhenjiang212013 China

Numerous regions across China have introduced "dual carbon" policies, yet the response of cities to these policies remains unclear. In this study, we used emission data from 271 Chinese cities for the years 2010, 2015, and 2020 to construct a complex network of urban emissions with a modified gravity model. By modeling the strategic interaction behavior of unban-level response to the policy, we simulated the diffusion process of the "dual carbon" policy among cities through network evolution analysis. It was found that China's carbon emission network primarily comprises four urban agglomerations: Beijing-Tianjin-Hebei, Yangtze River Delta, Pearl River Delta, and Sichuan-Chongqing. The "dual carbon" policy exhibits a network diffusion effect, with cost-effectiveness serve as a critical factor influencing its spread. And the current low carbon price in China does not provide adequate positive incentives for carbon reduction. Additionally, through counterfactual scenario analysis and an exploration of network structural characteristics, we highlighted the vital role of core cities within urban agglomerations in facilitating efficient policy diffusion. This study offers valuable insights for the selection of pilot cities and the sustainable regional dissemination of policies, providing guidance for more effective policy implementation. © 2024, The Authors. All rights reserved.

关键词： Complex networks

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Biogenic palladium prepared by activated sludge microbes for the hexavalent chromium catalytic reduction: Impact of relative biomass

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Frontiers of Environmental Science & Engineering 2020年第2期14卷 151-159页

作者： Luman Zhou Chengyang Wu Yuwei Xie Siqing Xia State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China

Palladium,a kind of platinum group metal,owns catalytic capacity for a variety of *** this study,Pd nanoparticles(PdNPs)were generated through enzymatic recovery by microbes of activated sludge at various biomass/Pd,and further used for the Cr(VI)*** results show that biomass had a strong adsorption capacity for Pd(II),which was 17.25 mg Pd/g *** XRD and TEM-EDX results confirmed the existence of PdNPs associated with microbes(bio-Pd).The increase of biomass had little effect on the reduction rate of Pd(II),but it could cause decreasing particle size and shifting location of Pd(0)with the better dispersion degree on the cell *** the Cr(VI)reduction experiments,Cr(VI)was first adsorbed on bio-Pd with hydrogen and then reduced using active hydrogen as electron *** improved the catalytic activity of *** the biomass/Pd(w/w)ratio increased to six or higher,Cr(VI)reduction achieved maximum rate that 50 mg/L of Cr(VI)could be rapidly reduced in one minute.

关键词： Palladium nanoparticles Activated sludge Hexavalent chromium

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High Performance of Reduced Graphene Oxideand G-C3n4co-Doped Cufe2o4 for Peroxymonosulfate Activation Under Visible Light: Degradation Process of Sulfamethazine Via a Singlet Oxygen Dominated Pathway

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SSRN 2023年

作者： Zhou, Jianzhuo Sun, Qiunan Wang, Xuejiang Liu, Yiyang Xia, Siqing Zhao, Jianfu State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and Engineering Tongji University Shanghai200092 China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092 China

Peroxymonosulfate (PMS) activation by heterogeneous metal-based catalysts has been extensively applied for the degradation of organic pollutants in water. However, the catalysts suffer from the low oxidant utilization efficiency, pH limitations and severe matrix interference. Here, a reduced graphene oxide (rGO) and g-C3N4co-doped cooper ferrite (rGO-CNCF) was synthesized and its performance for PMS activation under visible light was evaluated for removal of sulfamethazine. In the condition of rGO-CNCF (0.2g/L) and PMS (0.1g/L), the vis/rGO-CNCF/PMS system could degrade 99.9% of sulfamethazine (SMT, 10 mg/L) within 30 min at pH 7.0, and the system also showed high degrading abilty of SMT over a wide pH range (0-14), along with a good adaptability to common coexisting ions in water solution. The introduction of rGO not only enhanced the stability of rGO-CNCF but also changed the binding sites between PMS and rGO-CNCF which reduced the adsorption energy. Singlet oxygen (1O2) was unveiled to be the major reactive oxygen species (ROS), which was produced by the transformation between negatively charged PMS (HSO5-) and water ,along with the self-degradation of PMS. SMT was decomposed through four degradation pathways in this system, and quantitative structure-activity relationship (QSAR) predictions indicated a significant decrease in its toxicity. Results of this study indicated that the material can efficiently activate persulfate for the removal of organic pollutants from water under visible light conditions and it provided a novel catalytic system for removal of organic contaminants in water. © 2023, The Authors. All rights reserved.

关键词： Organic pollutants

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Long-Term and Multi-Scale Assessment of Enhancing Mechanisms of Methanogenesis in Magnetite Nanoparticle-Mediated Anaerobic Digestion: From Digester Performance, Biochemical Parameters to Microbial Communities

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SSRN 2024年

作者： Li, Jibin Sun, Desheng Wu, Siqi Yang, Wenlan Xiong, Lei Zhang, Weiming Hua, Ming Pan, Bingcai State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China School of the Environmental Science and Engineering Yangzhou University Yangzhou225000 China

Magnetite nanoparticles (Fe3O4-NPs) have been demonstrated to be involved in direct interspecies electron transfer between syntrophic bacteria, yet a comprehensive assessment of the ability of Fe3O4-NPs to cope with process instability and volatile fatty acids (VFAs) accumulation in scaled-up anaerobic reactors is still lacking. Here, we investigated the start-up characteristics of an expanded granular sludge bed (EGSB) with Fe3O4-NPs as an adjuvant at high organic loading rate (OLR). The results showed that methane production rate of R1 (with Fe3O4-NPs) was approximately 1.65 folds of R0 (control), and effluent COD removal efficiency was maintained at approximately 98.32% upon 20 kg COD/(m3·d) OLR. The components of volatile fatty acids are acetate and propionate, and the rapid scavenging of propionate accumulation was the difference between R1 and the control. The INT-ETS activity of R1 was consistently higher than that of R0 and R2, and the electron transfer efficiencies increased by 68.78% and 131.44%, respectively. Meanwhile, the CV curve analysis showed that the current of R1 was 40% higher than R3 (temporary addition of Fe3O4-NPs ), indicating that multiple electron transfer modes might coexist. High-throughput analysis further revealed that it was difficult to reverse the progressive deterioration of system performance with increasing OLR by simply reconfiguring bacterial community structure and abundance, demonstrating that the Fe3O4-NPs-mediated DIET pathway is a prerequisite for establishing multiple electron transfer systems. This study provides a long-term and multi-scale assessment of the gaining effect of Fe3O4-NPs in anaerobic digestion scale-up devices, and provides technical support for their practical engineering applications. © 2024, The Authors. All rights reserved.

关键词： Magnetite

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Recent progress on rational design of catalysts for fermentative hydrogen production

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SusMat 2022年第4期2卷 392-410页

作者： Yifan Chai Zhaoyuan Lyu Huitong Du Pan Li Shichao Ding Yujing Jiang Hua Wang Qianhao Min Dan Du Yuehe Lin Wenlei Zhu State Key Laboratory of Pollution Control and Resource Reuse State Key Laboratory of Analytical Chemistry for Life ScienceThe Frontiers Science Center for Critical Earth Material CyclingSchool of the EnvironmentSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjingP.R.China School of Mechanical and Materials Engineering Washington State UniversityPullmanWashingtonUSA School of Life Sciences Huzhou UniversityHuzhouP.R.China

The increasingly severe energy crisis has strengthened the determination to develop environmentally friendly *** hydrogen has emerged as a candi-date for clean *** many hydrogen generation methods,biohydrogen stands out due to its environmental sustainability,simple operating environ-ment,and cost *** review focuses on the rational design of catalysts for fermentative hydrogen *** principles of microbial dark fermen-tation and photo-fermentation are elucidated *** strategies to increase the efficiency of fermentative hydrogen production are summa-rized,and some recent representative works from microbial dark fermentation and photo-fermentation are ***,perspectives and discussions on the rational design of catalysts for fermentative hydrogen production are provided.

关键词： catalysts fermentation hydrogen production renewable energy

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Recent advances in carbon-supported non-precious metal singleatom catalysts for energy conversion electrocatalysis

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National Science Open 2023年第2期2卷 115-160页

作者： Li-Xia Liu Yangyang Ding Linan Zhu Jin-Cheng Li Huitong Du Xiang Li Zhaoyuan Lyu Dan Du Fuqiang Liu Yuanyuan Wang Wenlei Zhu Yuehe Lin State Key Laboratory of Pollution Control and Resource Reuse State Key Laboratory of Analytical Chemistry for Life Sciencethe Frontiers Science Center for Critical Earth Material CyclingSchool of the EnvironmentSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China School of Mechanical and Materials Engineering Washington State UniversityPullman WA 99164USA Faculty of Chemical Engineering Yunnan Provincial Key Laboratory of Energy Saving in Phosphorus Chemical Engineering and New Phosphorus MaterialsKunming University of Science and TechnologyKunming 650500China

Non-precious metal single-atom catalysts(NPM-SACs)with unique electronic structures and coordination environments have gained much attention in electrocatalysis owing to their low cost,high atomic utilization,and high ***-SACs on carbon support(NPM-SACs/CS)are promising because of the carbon substrate with a large surface area,excellent electrical conductivity,and high chemical *** review provides an overview of recent developments in NPM-SACs/CS for the electrocatalytic ***,the state-of-the-art synthesis methods and advanced characterization techniques of NPM-SACs/CS are discussed in ***,the structural adjustment strategy of NPM-SACs/CS for optimizing electrocatalytic performance is introduced ***,we provide a comprehensive summary of recent advances in developing NPM-SACs/CS for important electrochemical reactions,including carbon dioxide reduction reaction,hydrogen evolution reaction,oxygen evolution reaction,oxygen reduction reaction,and nitrogen reduction *** the end,the existing challenges and future opportunities of NPM-SACs/CS in the electrocatalytic field are highlighted.

关键词： single-atom catalysts non-precious metal electrocatalytic reaction carbon-supported

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Exogenous Application of Hesperidin Ameliorates Chromium Toxicity in Wheat Irrigated with Tannery Wastewater

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Phyton-International Journal of Experimental Botany 2025年第3期94卷 929-951页

作者： Gohar Ayoub Shafaqat Ali Muhammad Arslan Ashraf Shoaib Ahmad Mohamed A.El-Sheikh Department of Environmental Sciences Government College University FaisalabadFaisalabad38000Pakistan Department of Biological Sciences and Technology China Medical UniversityTaichung40402Taiwan Department of Botany Government College University FaisalabadFaisalabad38000Pakistan Department of Plant Biotechnology College of Life SciencesKorea UniversitySeoul02841Republic of Korea State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing210023China Botany and Microbiology Department College of ScienceKing Saud UniversityRiyadh11451Saudi Arabia

Chromium (Cr), a persistent soil pollutant, has detrimental effects on plants and living things, and its contamination in soil increased as a result of human-induced activities. Pakistan suffers from a lack of fresh water supplies;hence most people use metal-containing water and wastewater to irrigate their crops. Exposure to Cr toxicity, the plant reduces their morphological and physiological growth which ultimately decreases crop productivity. The current study was designed to investigate the foliar application of hesperidin (HSP) at varying effluent rates (25, 50, 75, and 100 mg L^(−1)) on wheat growth under tannery wastewater irrigated soil. Cr toxicity caused a change in the concentration of chlorophyll molecules, indicating early signs of stress. Modifications in the ultrastructure of chloroplasts, the elevated activity of chlorophyllase, and the generation of reactive oxygen species were causing the reduction in chlorophyll. Cr stress disrupted total soluble protein concentrations and the activity of antioxidation-related enzymes and NRA, suggesting the onset of oxidative stress. On the other hand, the application of HSP reduced oxidative damage by improving protein concentration (37%), chlorophyll concentration (37%), and antioxidant enzyme activity such as CAT (65%), SOD (46%), and POD (68%). Furthermore, HSP raised the concentrations of non-enzymatic antioxidant molecules, which may indicate better redox homeostasis and stress tolerance. These molecules include GSH, GSSG, ascorbic acid, flavonoids, phenolics, and anthocyanins. HSP therapy lessened the impact of Cr stress on lipid peroxidation markers. HSP enhanced these measures during the investigation. Cr stress raised the concentrations of total free amino acids and nitrogen oxide and decreased the radical scavenging activity in wheat. Cr stress raised the concentration of all soluble sugars, primarily reducing and non-reducing sugars, whereas the application of HSP strengthened these osmo protectants e

关键词： Chlorophyll concenttration foliar application hesperidin heavy metal.oxidant SPAD stress wheat crop

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Selective oxidation of emerging contaminants in sewer overflows: insights into the role of molecular structure

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Chemical Engineering Journal 2025年 516卷

作者： Guo, Qian Xu, Zuxin Chu, Wenhai Zhang, Jingyi Ren, Xueer Templeton, Michael R. State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and Engineering Tongji University Shanghai200092 China Ministry of Education Key Laboratory of Yangtze River Water Environment Tongji University Shanghai200092 China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092 China Department of Civil and Environmental Engineering Imperial College London United Kingdom

Sewer overflows are an important source of emerging contaminants (ECs) into to receiving waters. Efficient and selective oxidation of ECs is significant. Herein, the Fe(Ⅵ)/Fe(Ⅲ)/peroxymonosulfate(PMS)/sodium hypochlorite (NaClO) reaction system was proposed for the degradation of nine ECs in overflows. The target ECs were effectively degraded with a variation in the pseudo-first-order rate constant (kobs) due to the structure–activity relationship. The pollutants with electron-donating groups, high energy of the highest occupied molecular orbital (EHOMO), and low energy gap were more susceptible to attack, while electron-withdrawing groups impeded the degradation process. The benzene rings on pollutants were susceptible to attack by SO4∙-. The contribution of ClO∙ was related to the presence of –NH2 on pollutants. The electron-rich moieties were vulnerable to attack by 1O2. Notably, phosphate in the overflows can effectively activate PMS to produce more SO4∙-, which enhanced the pollutant degradation mediated by SO4∙-. Different pathways were involved in the degradation of pollutants even if they had the same parent structure, and the toxicity of the degradation intermediates was reduced compared to the parent. This study deepens the understanding of the relationship between molecular structure and pollutant degradation, which can provide guidance for the selective oxidation of ECs. © 2025 Elsevier B.V.

关键词： Molecular orbitals

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