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A Novel Post Coordination Modulation Method to Synthesize N/S Functionalized Zif-8 for Removal of Trace Heavy Metals from Drinking Water

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SSRN 2022年

作者： Zhang, Yu Zheng, Hong Zhang, Pengyi Zuo, Qi Zhang, Baichao Geng, Zhi Yang, Yanan Ren, Xueying Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes National Laboratory of Mineral Materials School of Material Sciences and Technology China University of Geosciences Beijing100083 China State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China

The functionalization of metal-organic frameworks (MOFs) has been considered an effective strategy for promoting heavy metals removal from water. Therefore, a novel post coordination modulation method was systematically studied to synthesize ZIF-8 functionalized by 2,5-Dimercapto-1,3,4-thiadiazole (Post-ZIF-8-DMTD) for trace heavy metals removal from drinking water. The effects of addition time and addition amount of DMTD on the structure and adsorption performance of Post-ZIF-8-DMTD were investigated. It was found that addition time of DMTD had minor impact, while addition amount of DMTD had great impact, appropriate DMTD addition amount (375 mg) could not only provide sufficient active sites but also avoid self-polymerization of DMTD. Post-ZIF-8-DMTD exhibited a more regular structure than Before-ZIF-8-DMTD synthesized by direct coordination of mim and DMTD with Zn2+, and had faster adsorption rate and deeper purification capability for trace Pb(II). Post-ZIF-8-DMTD also exhibited good stability, wide suitable pH range, high maximum adsorption capacity (4.34 mg/g) that met WHO effluent Pb(II) concentration standard and excellent capture capacity for many trace heavy metals in tap water, and could be regenerated effectively with thiourea solution. The post coordination modulation method provides a novel and efficient strategy for the functionalization of MOFs, and Post-ZIF-8-DMTD has excellent application prospects in drinking water purification. © 2022, The Authors. All rights reserved.

关键词： Potable water

Exploring atmospheric free-radical chemistry in China:the self-cleansing capacity and the formation of secondary air pollution

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National Science Review 2019年第3期6卷 579-594页

作者： Keding Lu Song Guo Zhaofeng Tan Haichao Wang Dongjie Shang Yuhan Liu Xin Li Zhijun Wu Min Hu Yuanhang Zhang State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and Engineering Peking University CAS Center for Excellence in Regional Atmospheric Environment Chinese Academy of Sciences

Since 1971, it has been known that the atmospheric free radicals play a pivotal role in maintaining the oxidizing power of the troposphere. The existence of the oxidizing power is an important feature of the troposphere to remove primary air pollutants emitted from human beings as well as those from the biosphere. Nevertheless, serious secondary air-pollution incidents can take place due to fast oxidation of the primary pollutants. Elucidating the atmospheric free-radical chemistry is a demanding task in the field of atmospheric chemistry worldwide, which includes two kinds of work: first, the setup of reliable radical detection systems; second, integrated field studies that enable closure studies on the sources and sinks of targeted radicals such as OH and NO3. In this review, we try to review the Chinese efforts to explore the atmospheric free-radical chemistry in such chemical complex environments and the possible link of this fast gas-phase oxidation with the fast formation of secondary air pollution in the city-cluster areas in China.

关键词： atmospheric chemistry free radicals new particle formations OH NO3

Effects and Mechanisms of Organic Matter Regulating the Methylmercury Dynamics in Mangrove Sediments

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SSRN 2022年

作者： Liu, Jingli Li, Yanping Duan, Dandan Peng, Guogan Li, Ping Lei, Pei Zhong, Huan Tsui, Martin Tsz-Ki Pan, Ke Shenzhen Key Laboratory of Marine Microbiome Engineering Institute for Advanced Study Shenzhen University Shenzhen518060 China Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen518060 China Ministry of Education Key Laboratory for Ecology of Tropical Islands College of Life Sciences Hainan Normal University Haikou571158 China State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China School of Life Sciences The Chinese University of Hong Kong Shatin China

Mangrove ecosystems serve as an important carbon sink but also could be a hotspot that produces neurotoxic methylmercury (MeHg). Although many studies have focused on mercury (Hg) contamination in this carbon-rich ecosystem, our understanding of the effects and mechanisms of the organic matter (OM) regulation of MeHg production in mangrove sediments is still limited. Here, we examined the effects of Hg contamination and OM enrichment on MeHg production in anoxic mangrove sediments and identified the major microbial guilds attending this process. The mangrove sediments possessed a high potential for producing MeHg, but this was counterbalanced by its rapid degradation. Sulfate-reducing bacteria (SRB) such as Desulfobacterales , Desulfovibrionales , and Syntrophobacterales were the major methylators. OM diagenesis significantly changed the biogeochemical conditions, accelerating MeHg removal in the sediments. The enhanced MeHg demethylation was attributable to the abundant sulfide produced during OM decomposition, which potentially inhibited the Hg methylation by immobilization of inorganic Hg, abiotically degraded MeHg, and favored the non- mer -mediated degradation of MeHg by SRB (e.g., Desulfosarcina and Desulfatiferula ). Our study provides both geochemical and microbial clues that can partly explain the low MeHg levels widely observed in mangrove sediments. © 2022, The Authors. All rights reserved.

关键词： Mercury compounds

Quantification of Biochemical Processes Governing Nitrate Delivery in a Tide Gate-controlled Seagoing River During the Closed Tide Gate Period

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SSRN 2022年

作者： Huang, Yinbin Fan, Zhongya Zhao, Changjin Chen, Gang Huang, Ju Zhou, Zhongbo Xiao, Yeyuan Department of Civil and Environmental Engineering College of Engineering Shantou University Guangdong Shantou515063 China National Key Laboratory of Water Environmental Simulation and Pollution Control South China Institute of Environmental Sciences Ministry of Ecology and Environment Guangzhou510530 China College of Resources and Environment Southwest University Chongqing400715 China

Substantial biochemical processes occur in tide gate-controlled seagoing rivers during the closed tide period, owing to the low-flow conditions, thus affecting nitrogen (N) delivery to estuaries;however, these processes have been scarcely examined. This study aimed to quantify the biochemical processes affecting nitrate fate and transport in Lianjiang River, Guangdong, China, during the closed tide gate period, via daily grab water sampling at four equidistant sample sites upstream from the tide gate and continuous on-line water monitoring at the gate. The survey from July to December 2020 showed that the mean nitrification rate peaked at 0.45 mg L -1 d -1 in October and was gradually reduced to 0.32 mg L -1 d -1 in December. Conversely, the mean total nitrogen removal rate was at the lowest level of 0.34 mg L -1 d -1 in September, but increased to 0.68 mg L -1 d -1 in December. Likewise, the mean N assimilatory uptake rate was increased from the lowest level of 0.21 mg L -1 d -1 in September to 0.36 mg L -1 d -1 in December, coinciding with the increase in NO 3 - -N concentration from 0.43 mg L -1 to 5.66 mg L -1 at site LB. These results suggest the substrate concentration decided the overall N transformation efficiency in Lianjiang River. Nitrification dominated in the early stage of the closed tide gate period at the upstream section, while denitrification was greatly enhanced along the river and with time, resulting in a significant amount of N removal in winter in the river. Therefore, N removal through nitrification-denitrification was promoted by closing of the tide gate. This study provides new insight into long-term N transport and fate in the upstream section of a closed tide gate to develop optimal tide gate regulation schemes. © 2022, The Authors. All rights reserved.

关键词： Nitrates

Spatial Characterization of Hcho and Reapportionment of its Secondary Source Under the Condition of Photochemical Loss in Taiyuan, China

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SSRN 2022年

作者： Hua, Jingya Cui, Yang Guo, Lili Li, Hongyan Fan, Jie Li, Yanan Wang, Yonghong Liu, Kankan He, Qiusheng Wang, Xinming School of Environment and Resources Taiyuan University of Science and Technology Taiyuan030024 China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China School of Environment and Safety Engineering North University of China Taiyuan030051 China State Key Laboratory of Organic Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou510640 China

Formaldehyde (HCHO) plays the important roles in atmospheric ozone (O3) formation. To better understand the sources of HCHO, carbonyls and volatile organic compounds (VOCs) were measured at three urban sites (Taoyuan, TY-U;Jinyuan, JY-U;Xiaodian, XD-U) and a suburban site (Shanglan, SL-B) in Taiyuan during the high O3 period from July 20 to August 3, 2020. The average mixing ratio of HCHO at XD-U (8.1 ± 2.8 ppbv) was comparable to those at TY-U (7.4 ± 2.1 ppbv) and JY-U (7.0 ± 2.3 ppbv) but higher (p © 2022, The Authors. All rights reserved.

关键词： Formaldehyde

Pathways of China's PM2.5 air quality 2015–2060 in the context of carbon neutrality

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National Science Review 2021年第12期8卷 63-73页

作者： Jing Cheng Dan Tong Qiang Zhang Yang Liu Yu Lei Gang Yan Liu Yan Sha Yu Ryna Yiyun Cui Leon Clarke Guannan Geng Bo Zheng Xiaoye Zhang Steven J.Davis Kebin He Ministry of Education Key Laboratory for Earth System Modelling Department of Earth System ScienceTsinghua University Department of Earth System Science University of California Chinese Academy of Environmental Planning Joint Global Change Research Institute Pacific Northwest National LaboratoryUniversity Research Court Center for Global Sustainability School of Public PolicyUniversity of Maryland State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua University Institute of Environment and Ecology Tsinghua Shenzhen International Graduate SchoolTsinghua University State Key Laboratory of Severe Weather&Key Laboratory of Atmospheric Chemistry of CMA Chinese Academy of Meteorological Sciences

Clean air policies in China have substantially reduced particulate matter(PM2.5) air pollution in recent years,primarily by curbing end-of-pipe ***,reaching the level of the World Health Organization（WHO） guidelines may instead depend upon the air quality co-benefits of ambitious climate ***,we assess pathways of Chinese PM2.5air quality from 2015 to 2060 under a combination of scenarios that link global and Chinese climate mitigation pathways(*** 2℃-and 1.5℃-pathways,National Determined Contributions（NDC） pledges and carbon neutrality goals) to local clean air *** find that China can achieve both its near-term climate goals（peak emissions） and PM2.5air quality annual standard（35 μg/m3） by 2030 by fulfilling its NDC pledges and continuing air pollution control ***,the benefits of end-of-pipe control reductions are mostly exhausted by 2030,and reducing PM2.5exposure of the majority of the Chinese population to below 10 μg/m3by 2060 will likely require more ambitious climate mitigation efforts such as China' s carbon neutrality goals and global1.5℃-*** results thus highlight that China's carbon neutrality goals will play a critical role in reducing air pollution exposure to the level of the WHO guidelines and protecting public health.

关键词： clean air policy carbon neutrality synergy pathway air quality standards WHO guidelines

Pyrolyzed Iron–Nitrogen–Carbon Hybrids Enable Efficient Periodate Activation Toward Contaminant Decomposition: Active Site, Degradation Mechanism, and Influential Factors

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SSRN 2022年

作者： Long, Yangke Huang, Shixin Zhao, Shiyin Xiao, Guicong Sun, Jianlin Peng, Dan Department of Transportation and Environment Shenzhen Institute of Information Technology Shenzhen518172 China Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control School of Environmental Science and Engineering Southern University of Science and Technology Shenzhen518055 China College of Science National University of Defense Technology Changsha410073 China Guangzhou University China

To incorporate periodate-based advanced oxidation technologies (PI-AOTs) into practical wastewater treatment, there is a need for efficient and affordable activators. Pyrolyzed Fe–N/C materials are candidates for this purpose, but their actual active sites and associated activation mechanisms remain unclear. Herein, a series of Fe–N/C samples (denoted as Fe@NC-X) with differing structures and iron components was delicately synthesized. Experimental studies of the structure–activity relationship and density functional theory (DFT) computations revealed that Fe–Nx species dominated as the active site responsible for periodate activation, while the inactive iron-based particles (i.e., Fe0 and Fe3C) optimized the binding affinity of their surrounding carbon layers toward periodate to confer enhanced activity. In-depth exploration of the oxidative mechanism revealed that Fe@NC-X activated periodate through an electron transfer regime. We also showed that the optimal Fe@NC-0.2/periodate system exhibited superior activity for 4-CP oxidation with a high apparent rate constant of 0.38 min−1, which exceeded that of many reported activators. Moreover, Fe@NC-0.2/periodate is effective for eliminating miscellaneous organic pollutants and is strongly resistant to environmental interference. These findings provide an indispensable foundation for the rational development of advanced Fe–N/C activators and offer vital insights into the underlying mechanism underlying pollutant destruction through PI-AOTs. © 2022, The Authors. All rights reserved.

关键词： Wastewater treatment

Integrated carbon and nitrogen management for cost-effective environmental policies in China

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Science (New York, N.Y.) 2025年第6751期388卷 1098-1103页

作者： Xin Xu Xiuming Zhang Yiyang Zou Tianrun Chen Jingfang Zhan Luxi Cheng Wilfried Winiwarter Shaohui Zhang Peter M Vitousek Wim de Vries Baojing Gu State Key Laboratory of Soil Pollution Control and Safety Zhejiang University Hangzhou China. College of Environmental and Resource Sciences Zhejiang University Hangzhou China. International Institute for Applied Systems Analysis Laxenburg Austria. Ministry of Education Key Laboratory of Environment Remediation and Ecological Health Zhejiang University Hangzhou China. College of Computer Science and Technology Zhejiang University Hangzhou China. Policy Simulation Laboratory Zhejiang University Hangzhou China. Institute of Environmental Engineering University of Zielona Góra Zielona Góra Poland. School of Economics and Management Beihang University Beijing China. Department of Earth System Science Stanford University Stanford CA USA. Wageningen University and Research Earth Systems and Global Change Group Wageningen Netherlands. Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment Zhejiang University Hangzhou China.

Carbon and nitrogen are central elements in global biogeochemical cycles. To effectively manage carbon and nitrogen in China, we developed a comprehensive model for quantifying their fluxes, investigating their interplay across 16 human and natural subsystems. Between 1980 and 2020, nitrogen losses in China increased 2.3-fold and carbon emissions surged 6.5-fold. Integrated carbon and nitrogen management holds the potential for a 74% reduction in nitrogen losses to air and water and a 91% decrease in carbon emissions to the atmosphere by 2060. Compared with separate control of carbon or nitrogen, integrated management delivers an additional reduction of 1.8 million tons of nitrogen and 26.5 million tons of carbon by 2060, bringing out a 37% decrease in unit abatement cost and a net societal benefit of 1384 billion USD.

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Accelerating exploitation and integration of global renewable energy

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Innovation 2025年

作者： Wang, Jianxiao Chen, Xinjiang Zhuang, Minghao Li, Yan Ruan, Ziwen Wang, Yuhan Zhang, Ning Song, Jie He, Kebin Lu, Xi National Engineering Laboratory for Big Data Analysis and Applications Peking University Beijing100871 China Department of Industrial Engineering and Management College of Engineering Peking University Beijing100871 China Peking University Ordos Research Institute of Energy Ordos017000 China State Key Laboratory of Nutrient Use and Management College of Resources and Environmental Sciences China Agricultural University Beijing100193 China College of Environmental Science and Engineering Tongji University Shanghai200092 China School of Environment State Key Joint Laboratory of Environment Simulation and Pollution Control Tsinghua University Beijing100084 China State Key Lab of Power Systems Department of Electrical Engineering Tsinghua University Beijing100084 China Institute for Carbon Neutrality Tsinghua University Beijing100084 China