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SSRN 2024年

作者： Yang, Nina Zuo, Jiane Men, Cong Zhang, Yanyan Xie, Zhenwen State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China Shenzhen International Graduate School Tsinghua University Shenzhen518055 China School of Energy and Environmental Engineering Beijing Key Laboratory of Resource-Oriented Treatment of Industrialpollutants University of Science and Technology Beijing Beijing100083 China Chengdu Xingrong Environment Co. Ltd Chengdu610041 China Chengdu Drainage Co. Ltd Chengdu610011 China

In rivers, the generation of micro(nano)plastics and the release of additives resulting from plastic weathering pose significant environmental threats. However, systematic research on the weathering behaviors of plastics mentioned above is still limited. This study systematically explored these phenomena by exposing PS to UV irradiation and mechanical agitation for different durations (1 day, 5 days, 10 days, 20 days). The results indicated a progressive increase in both the extent of polystyrene (PS) ageing and the abundance of carbonyl (C=O) functional groups throughout the weathering process. Notably, flake bulges and cracks emerged as characteristic features of PS ageing. A positive correlation was identified between the released micro(nano)plastics content and the extent of plastic ageing. Laser infrared and Raman tests indicated that microplastics originating from polystyrene (PS) within the 10-20 μm size range accounted for the largest fraction over time and remained relatively stable. Simultaneously, the proportions of 20 μm microplastics consistently approached parity, gradually increasing. In the later stage, the proportions of all three tended to equalize. The dominant size range of nanoplastics shifted towards smaller sizes over time, albeit with a certain limit. Twenty types of chemicals were detected, including bisphenol A (BPA), dibutyl phthalate (DBP) and Di(2-ethylhexyl) phthalate (DEHP), with antioxidant 168 showing the highest content. The release of plastic additives was influenced by a combination of ageing time, additive type, and quantity. This study provided a comprehensive overview of the plastic weathering process and practical information for managing plastic pollution in rivers. © 2024, The Authors. All rights reserved.

关键词： Polystyrenes

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Mechanochemical templated synthesis of mesoporous alumina-supported polyoxometalate catalysts toward selective oxidation of sulfides †

RSC Mechanochemistry

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RSC Mechanochemistry 2025年第3期2卷 394-398页

作者： Kang Xia Shengtai Hou Qiang Niu Kosuke Suzuki Pengfei Zhang School of Chemistry and Chemical Engineering Shanghai Jiao Tong University Shanghai 200240 China chemistryzpf@*** Department of Applied Chemistry School of Engineering The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 1138656 Japan Hebei Key Laboratory of Close-to-Nature Technology of Wetlands School of Eco-Environment Hebei University Baoding 071002 China National Enterprise Technology Center Inner Mongolia Erdos Electric Power and Metallurgy Group Co. Ltd Ordos Inner Mongolia 016164 China State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering Ningxia University Yinchuan 750021 China pfzhang@***

Polyoxometalates are important catalysts, but their low surface area and leaching in solutions present challenges. We developed a facile, green, solvent-free mechanochemical method to anchor polyoxometalates on mesoporous alumina. The resulting catalysts showed high activity, selectivity in sulfide oxidation, and reusability for at least seven cycles, achieving gram-scale reactions efficiently.

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AQDS-functionalized biochar enhances the bioreduction of Cr(VI) by Shewanella putrefaciens CN32

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Chemosphere 2024年 363卷 142866页

作者： Zhou, Tianhong Chen, Hai Guo, Xiaonan Zhang, Jianda Meng, Ying Luan, Fubo School of Environmental and Municipal Engineering Lanzhou Jiaotong University Gansu Lanzhou730070 China Key Laboratory of Yellow River Water Environment in Gansu Province Gansu Lanzhou730070 China Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China College of Resources and Environmental Science of Hebei Normal University Hebei Technology Innovation Center for Remote Sensing Identification of Environmental Change Hebei Key Laboratory of Environmental Change and Ecological Construction Shijiazhuang050024 China University of Chinese Academy of Sciences Beijing100049 China

The bioreduction of toxic chromium(VI) to sparingly soluble chromium(III) represents an environmentally friendly and cost-effective method for remediating Cr contamination. Usually, this bioreduction process is slow and requires the addition of quinone compounds as electron shuttles to enhance the reaction rate. However, the dissolved quinone compounds are susceptible to loss with water flow, thereby limiting their effectiveness. To address this challenge, this study loaded anthraquinone-2,6-disulfonate (AQDS), a typical quinone compound, onto biochar (BC) to create a novel solid-phase electron mediator (BC-AQDS) that can sustainably promote Cr(VI) bioreduction. The experimental results demonstrated that BC-AQDS significantly promoted the bioreduction of Cr(VI), where the reaction rate constant increased by 4.81 times, and the reduction extent increased by 38.31%. X-ray photoelectron spectroscopy and Fourier-Transform Infrared Spectroscopy analysis revealed that AQDS replaced the –OH functional groups on the BC surface to form BC-AQDS. Upon receiving electrons from Shewanella putrefaciens CN32, BC-AQDS was reduced to BC-AH2DS, which subsequently facilitated the reduction of Cr(VI) to Cr(III). This redox cycle between BC-AQDS and BC-AH2DS effectively enhanced the bioreduction rate of Cr(VI). Our study also found that a lower carbonization temperature of BC resulted in a higher surface –OH functional group content, enabling a greater load of AQDS and a more pronounced enhancement effect on the bioreduction of Cr(VI). Additionally, a smaller particle size of BC and a higher dosage of BC-AQDS further contributed to the enhancement of Cr(VI) bioreduction. The preparation of BC-AQDS in this study effectively improve the utilization of quinone compounds and offer a promising approach for enhancing the bioreduction of Cr(VI). It provides a more comprehensive reference for understanding and solving the problem of Cr pollution in groundwater. © 2024 Elsevier Ltd

关键词： X ray photoelectron spectroscopy

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Improvement of Surface Stability of Zn Anode by a Cost-Effective Ercl3 Additive for Realizing High-Performance Aqueous Zinc-Ion Batteries

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SSRN 2023年

作者： Xiong, Yi Gu, Xingxing Liu, Zixun Ren, Xiaolei Jiang, Yanke Xu, Hanyu Zhuo, Lin Jiang, Guangming Chongqing Key Laboratory of Catalysis and New Environmental Materials College of Environment and Resources Chongqing Technology and Business University Chongqing400067 China Engineering Research Center for Waste Oil Recovery Technology and Equipment Ministry of Education Chongqing Technology and Business University Chongqing400067 China

Even rechargeable aqueous zinc-ion batteries (AZIBs) possess notable advantages in terms of enhanced safety and reduced cost. It is also facing the disadvantages of severe dendrite growth, zinc anode corrosion, and hydrogen evolution reaction, which pose obstacles to its actual implementation. Hence, this study presents the introduction of an economical and effective ErCl3 electrolyte additive to stabilize the Zn anode surface and address the aforementioned issues. The introduced Er3+ will cover the raised zinc dendrite surface and weaken the "tip effect" on the surface of the zinc anode via the "electrostatic shielding" effect. Simultaneously, the introduced Cl– can reduce the polarization of the zinc anode. Due to the collaborative effect of Er3+ and Cl–, the zinc anode corrosion, dendrite growth and hydrogen evolution have been efficiently inhibited. As a result, the utilization of an ErCl3 additive in the Zn||Zn-symmetric battery can exhibit the capability of achieving stable cycling for a duration of 1100 hours at 1 mA cm–2, 1 mAh cm–2, and exhibit a high average coulomb efficiency (99.2%). Meanwhile, Zn||MnO2 full battery based on ErCl3-added electrolyte also results in a reversible capacity of 157.1 mAh g–1 after 500 cycles. Remarkably, the battery has a little capacity decay of about 0.113% per cycle. This study offers a straightforward and economically efficient method for stabilizing the zinc anode and realizing high-performance AZIBs. © 2023, The Authors. All rights reserved.

关键词： Chlorine compounds

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An Eco-Friendly Reservoir Operation Method to Balance Economic Benefits with Migration Protection for Grass Carps

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SSRN 2024年

作者： Liu, Hongrui Xu, Zhihao Yin, Xinan Wang, Jieliang Yang, Baiheng Zhou, Lei Yang, Wei Unit 32182 of People's Liberation Army Beijing100042 China State Key Laboratory of Water Environment Simulation School of Environment Beijing Normal University No. 19 Xinjiekouwai Street Beijing100875 China Guangdong Provincial Key Laboratory of Water Quality Improvement and Ecological Restoration for Watersheds Institute of Environmental and Ecological Engineering Guangdong University of Technology Guangzhou510006 China Unit 32377 of People's Liberation Army Beijing100029 China

Construction and operation of dams change the water's natural flow and thermal regimes, thus affecting normal migration of many fish species to reproduce or feed. Although existing eco-friendly reservoir operation studies have considered downstream flow or water temperature management to protect fish migration, there is still a lack of simultaneous management of flow and water temperature. In this study, we developed a reservoir operation optimization approach that balances socioeconomic benefits with reproductive migration of grass carps in China. We used a coupled hydrodynamic and water quality model based on the environmental Fluid Dynamics Code (EFDC) platform to simulate release water temperature and flow velocity under multiple reservoir operation scenarios. We then used the simulation data to train a dynamic artificial neural network (ANN) that predicted the release water temperature. By coupling the ANN with a reservoir operation optimization method, we developed a multi-objective optimization approach to simultaneously optimize water supply, hydropower generation, and migration protection for grass carps. We applied the model to China’s Danjiangkou Reservoir as a case study to generate optimal rules for reservoir operation. The optimal operation scheme increased the multi-year-averaged annual fish migration quality, which is related to swimming behavior and gonad development and is influenced by water temperature and flow velocity, by 16.7%, while increasing economic losses by 10.0% and decreasing hydropower generation by 12.8%. We also generated Pareto-optimal solutions to analyze the tradeoffs between economic benefits and fish migration protection. Our results promote efficient use of reservoir operations for fish migration protection and offer an optimization tool for hydro-ecological management. © 2024, The Authors. All rights reserved.

关键词： Water temperature

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An Efficient Zn/Fe-Nc Catalyst Derived from Bimetallic Zeolitic Imidazole Frameworks for Oxygen Reduction Reaction in Air-Cathode Microbial Fuel Cell

SSRN

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SSRN 2023年

作者： Wang, Qianwu Lu, Jingzhao Liu, Songlin Liang, Bolong Yu, Boqu School of Eco-Environment Hebei Key Laboratory of Close-to-Nature Restoration Technology of Wetlands Hebei University Baoding071002 China College of Environmental Science and Engineering Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria Tianjin Key Laboratory of Environmental Remediation and Pollution Control Nankai University Tianjin300350 China College of Science and Technology Hebei Agricultural University Cangzhou061100 China State Key Laboratory of Pollution Control and Resource Reuse Nanjing University Nanjing210093 China

The development of carbon-based catalysts to substitute Pt-based catalysts for the oxygen reduction reaction is of great importance to promote their practical application in energy conversion. Herein, we prepare Zn/Fe and nitrogen-codoped porous carbon (Zn/Fe-NC-x) as a cathode catalyst via a facile one-step pyrolysis predesigned bimetallic zeolitic imidazole framework. Systematic electrochemical studies demonstrate that the synthesized Zn/Fe-NC-0.5 possesses higher electrocatalytic activity towards oxygen reduction reaction. In particular, Zn/Fe-NC-0.5 has a smaller charge transfer resistance, larger exchange current density, and much higher open circuit potential and mainly proceededs via an efficient four-electron pathway. The microbial fuel cell equipped with the synthesized catalyst exhibits the highest maximum power density of 1954 ± 20 mW m-2. In addition, the effects of the iron doping content on the performance of the oxygen reduction reaction and maximum power density are evaluated: a moderate Fe doping content plays a crucial role in improving the catalytic activity, and the synergistic effect of Fe and N codoping promotes the cathode performance. In brief, Zn/Fe-NC, with advantages of facile synthesis, environmental friendliness and excellent electrochemical activity is a promising Pt-alternative catalyst for air-cathode microbial fuel cells in the future. © 2023, The Authors. All rights reserved.

关键词： Carbon

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Preparation and Characterization of Na2FeO3

SSRN

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SSRN 2023年

作者： Yan, Huidi Guo, Haoda Zhang, Naidong Zhao, Yankang College of Environmental Science and Engineering Dalian Maritime University Dalian116026 China State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology Harbin150090 China Dalian Maritime University China

Na2FeO3 serves as a highly effective water-purifying agent, demonstrating superior performance when compared to ferrate(VI). This study focuses on the eco-friendly synthesis of green Na2FeO3 crystals utilizing sodium hypochlorite as the medium through a concentration method under depressurization. The green crystallization is meticulously characterized and identified as Na2FeO3, employing Infrared spectroscopy, UV/Vis spectroscopy, and X-ray diffraction techniques. Furthermore, this investigation delves into the impact of varying concentrations of Fe2(SO4)3, NaOH, NaClO, and reaction temperature on the yield of Na2FeO3. The findings reveal that the optimal conditions for preparation are as follows: [Fe2(SO4)3] = 0.67 mol/L, [NaClO] = 0.68 mol/L, [NaOH] = 7.5 mol/L, with a reaction temperature of 80°C. Under these conditions, the maximum yield of Na2FeO3 reaches 0.57 mol/L. The study offer crucial theoretical support for the large-scale production of Na2FeO3, contributing to advancements in water purification technology. Additionally, quinoline yellow degradation experiments were conducted, which demonstrated that under conditions where the addition amount was the same at 0.03mol/L, the TOC removal rate reached 53.63% within 60 min, which was superior to K2FeO4 © 2023, The Authors. All rights reserved.

关键词： Iron compounds

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Land subsidence in coastal reclamation with impact on metro operation under rapid urbanization: A case study of Shenzhen

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Science of the Total environment 2025年 970卷 179020页

作者： Yang, Xinxin Wu, Huaina Zhou, Suhua Guo, Desai Chen, Renpeng College of Civil Engineering Hunan University Changsha410082 China Hunan Provincial Engineering Research Center of Advanced Technology and Intelligent Equipment for Underground Space Development Changsha410082 China Key Laboratory of Building Safety and Energy Efficiency of the Ministry of Education Changsha410082 China National Center for International Research Collaboration in Building Safety and Environment Hunan University Changsha410082 China

With rapid urbanization in coastal cities, the sharp increase in coastal reclamation due to human activity has caused serious land subsidence problems and threatened the safety of urban traffic in reclamation areas, especially in fast developing cities, such as Shenzhen. However, the spatio-temporal distribution of reclamation evolution and land subsidence to assist in metro operations on a regional scale remain under-explored. To fill-in this research gap, an attempt was made to monitor the coastal reclamation dynamics of Shenzhen from 1979 to *** spatial-temporal changes in the reclamation were discussed based on the Landsat 5, 7 and 8 datasets along with urban growth for a 40-year period. Accordingly, the fill height distribution was employed using available global DEM datasets to perform land fill height effect of metro system in the reclamation area. After understanding the spatial-temporal patterns of land reclamation changes, we focused on monitoring the land subsidence in reclamation area using time-series Sentinel-1 Interferometric SAR (InSAR) datasets by SVD and Stacking techniques. 48 scenes were acquired during ascending and descending passes respectively between 8/3/2015 to 8/8/2023 for the study area. The field measurements of metro deformation in reclamation area acquired from investigation data reflects the risk level of metro operational risk of urban traffic. In-depth analysis of reclamation characteristics revealed a direct relationship between urban expansion, land subsidence and metro deformation. A high correlation coefficient of 0.89 was observed between land subsidence variation and the metro deformation measured along metro line 2 and line 11 in reclamation area. Understanding the impact of land subsidence on metro operation is key to refining sustainable urban development in reclamation areas. © 2025

关键词： Urban planning

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NOx storage and reduction assisted by non-thermal plasma over Co/Pt/Ba/γ-Al2O3 catalyst using CH_(4) as reductant

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Plasma Science and technology 2021年第2期23卷 76-84页

作者： Tao ZHU Xing ZHANG Nengjing YI Haibing LIU Zhenguo LI Institute of Atmospheric Environmental Management and Pollution Control China University of Mining&Technology(Beijing)Beijing 100083People's Republic of China Solid Waste and Chemicals Management Technology Center China Ministry of Ecology and EnvironmentBeijing 100029People's Republic of China National Engineering Laboratory for Mobile Source Emission Control Technology China Automotive Technology&Research Center Co.Ltd.Tianjin 300300People's Republic of China State Key Laboratory of Organic Geochemistry Chinese Academy of SciencesGuangzhou 510640People's Republic of China

NOx storage and reduction(NSR)technology has been regarded as one of the most promising strategies for the removal of nitric oxides(NOx)from lean-burn engines,and the potential of the plasma catalysis method for NOx reduction has been confirmed in the past few *** work reports the NSR of nitric oxide(NO)by combining non-thermal plasma(NTP)and Co/Pt/Ba/γ-Al2O3(Co/PBA)catalyst using methane as a *** experimental results reveal that the NOx conversion of NSR assisted by NTP is notably enhanced compared to the catalytic efficiency obtained from NSR in the range of 150°C–350°C,and NOx conversion of the 8%Co/PBA catalyst reaches 96.8%at 350°***(O_(2))has a significant effect on the removal of NOx,and the NOx conversion increases firstly and then decreases when the O_(2)concentration ranges from 2%to 10%.Water vapor reduces the NOx storage capacity of Co/PBA catalysts on account of the competition for adsorption sites on the surface of Co/PBA *** is a negative correlation between sulfur dioxide(SO_(2))and NOx conversion in the NTP system,and the 8%Co/PBA catalyst exhibits higher NOx conversion compared to other catalysts,which shows that Co has a certain SO_(2)resistance.

关键词： non-thermal plasma NOx storage and reduction Co/Pt/Ba/γ-Al2O3 catalyst NOx conversion influence parameter

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Coupled modeling of rafting behaviour in nickel-based single crystal superalloys

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International Journal of Mechanical Sciences 2025年 297-298卷

作者： Lu, Pin Guo, Zixu Fan, Xueling Xu, Yilun Zhang, Yong-Wei Yan, Wentao Xi'an Key Laboratory of Extreme Environment and Protection Technology School of Aerospace Engineering Xi'an Jiaotong University Xi'an710049 China Department of Mechanical Engineering National University of Singapore Singapore117575 Singapore 1 Fusionopolis Way #16-16 Connexis Singapore138632 Singapore Department of Materials Imperial College LondonSW7 2AZ United Kingdom

Nickel-based single-crystal (NBSX) superalloys applied to turbine blades on advanced aero-engines, suffer from the creep degradation induced by microstructure evolution at high temperatures. Here, our experiments revealed a unique morphology change of γ' phase in NBSX superalloys during rafting, i.e. the fusion of adjacent γ' phase domains first appeared at both vertices of the vertical channel, rather than at the center of the channel. To comprehensively understand the mechanism of γ' phase domain evolution during creep, we integrate a cellular automata (CA) algorithm into a crystal plasticity finite element model (CPFEM) to simulate the evolution of γ' phase domains and creep deformation for NBSX superalloys. A microstructure evolution model is established to simultaneously capture the dissolution, coarsening, and rafting of γ' phase domains, which are implemented via a CA algorithm. The evolution rule of aluminum atomic equilibrium concentration driven by deformation energy, is introduced into the CPFEM-CA model to capture the unique γ' morphology evolution. The coupled model has been validated against experimental rafting data of NBSX superalloys. The results indicate that the observed unique rafting morphology is related to the element diffusion driven by deformation energy and leads to local stress concentration. The proposed CPFEM-CA model not only enhances the fundamental understanding of the γ' rafting behavior in NBSX superalloys, but also provides a powerful simulation tool for the creep behavior of γ'-strengthened superalloys. © 2025 The Author(s)

关键词： Single crystals

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