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Sustainable Cu2(OH)2CO3/g-C3N4/cellulose acetate-derived porous composite membrane for Congo red and tetracycline removal with photocatalytic self-cleaning properties under natural solar irradiation

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Sustainable Horizons 2023年 5卷

作者： Kong, Lingchao Wang, Qinyu Wang, Yi Yan, Qinlin Qiu, Wenhui Zheng, Chunmiao State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control Southern University of Science and Technology Guangdong Shenzhen518055 China School of Environment Harbin Institute of Technology Harbin150090 China Department of Ocean Science and Engineering Southern University of Science and Technology Shenzhen518055 China EIT Institute for Advanced Study Zhejiang Ningbo315200 China

A highly efficient and sustainable Cu/CN@CA composite membrane was synthesized for the removal of typical dyes and antibiotics by incorporating a Cu2(OH)2CO3/g-C3N4 heterojunction (Cu/CN) onto a cellulose acetate (CA) membrane. The 0.2Cu/CN@CA membrane with optimized Cu/CN doping achieved superior Congo red (CR) and tetracycline (TC) adsorption capacities of 250.8 and 48.43 mg/g, respectively. Notably, the exhausted 0.2Cu/CN@CA after adsorption saturation could be effectively self-cleaned under natural solar irradiation. Consecutive adsorption-photocatalytic experiments revealed its fine stability and recyclability. Mechanistic exploration based on experimental analysis and DFT (Density Function Theory) calculations revealed that cellulose acetate accommodates the charge transfer interactions between g-C3N4 and Cu2(OH)2CO3, wherein many photogenerated electrons were generated and migrated from g-C3N4 to Cu2(OH)2CO3. This type II heterojunction transfer pathway induced the strong oxidizability of the 0.2Cu/CN@CA membrane with plenty of active species for the photocatalytic degradation of the adsorbed CR and TC contaminants under solar light irritation. This study provided a novel sustainable membrane-based adsorbent for the enhanced dye and antibiotic contaminant remediation of aquatic environments. © 2023

关键词： Adsorption

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Dom Contributions to Nitrate Enrichment in groundwater in the Semi-Arid Area of North China Plain: Evidence from Dom Optical and Molecular Characteristics

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SSRN 2023年

作者： Ding, Hongyu Zheng, Mingxia Yu, Minda Zhu, Mingtan Sun, Yuanyuan Su, Jing Xi, Beidou State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental Sciences Beijing100012 China State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution Chinese Research Academy of Environmental Sciences Beijing100012 China College of Water Science Beijing Normal University Beijing100875 China School of Environment and Civil Engineering Jiangnan University Wuxi214122 China

Specific components of dissolved organic matter (DOM) may serve as indicators of the nitrate accumulation process in groundwater. However, the precise mechanisms underlying the enrichment of nitrate based on DOM characterization in groundwater systems remain unclear. This study aims to reveal the sources and pathways of the nitrate accumulation process through the application of three-dimensional Excitation Emission Matrices (EEM) and Fourier Transform Ion Cyclotron Resonance Mass Spectrometry (FT-ICR-MS). The presence of fresh DOM components which show high biological activity, resulting from the leaching of organic matter in the subsoil and the excessive input of manure and sewage, contributes to elevated nitrate levels in the porous aquifer. The main contributors to inorganic nitrate accumulation are DOM formulas containing a higher number of nitrogen atoms. DOM formulas containing three nitrogen atoms, characterized by larger mass weights and lower H/C ratios, are closely associated with a readily bioavailable fraction. Consequently, the observed high rate of nitrate accumulation in the groundwater samples can be attributed to the high bioavailability of nitrogen-containing molecules. This study provides a molecular perspective on the characterization of DOM and its relationship with nitrate accumulation in groundwater systems, offering valuable insights for a more accurate assessment of potential nitrogen stocks in groundwater. © 2023, The Authors. All rights reserved.

关键词： Nitrates

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Accumulation Kinetics of Polystyrene Nano- and Microplastics in the Waterflea Daphnia Magnaand Trophic Transfer to the Mysid Limnomysis Benedeni

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SSRN 2024年

作者： Yu, Qi Nederstigt, Tom A.P. Wang, Zhuang Wu, Juan Bosker, Thijs Peijnenburg, Willie J.G.M. Vijver, Martina G. State Environmental Protection Key Laboratory of Water Environmental Simulation and Pollution Control South China Institute of Environmental Science Ministry of Ecology and Environment Guangzhou510535 China Leiden University Leiden2300 RA Netherlands School of Environmental Science and Engineering Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Nanjing University of Information Science and Technology Nanjing210044 China Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province Zhejiang University of Technology Hangzhou310014 China Bilthoven3720 BA Netherlands

Trophic transfer of nano- and microplastics (NMPs) within food webs is poorly understood. Here we investigated the accumulation of differently sized polystyrene particles (PSPs) in Daphnia magna and their subsequent transfer to Limnomysis benedeni, explicitly accounting for the fate of the PSPs in the aquatic system as a function of particle size (26, 500 and 4800 nm). L. benedeni were fed D. magna exposed to 8 mg/L PSPs for 16 h and were subsequently depurated for 48 h in the absence of food. On the basis of the mass of particles accumulated in the organisms, the internal concentration of 4800 nm PSPs was found to be 4 -10 times higher than that of 26 and 500 nm PSPs in D. magna. Uptake rate constants in daphnids for 26 nm (1.7 ± 0.4 L/g·h) and 4800 nm (1.7 ± 0.4 L/g·h) were significantly (p © 2024, The Authors. All rights reserved.

关键词： Rate constants

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Combining Data Dependent and Data Independent Acquisition Techniques for Monitoring Contaminants of Emerging Concern in the Pearl River

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SSRN 2023年

作者： Wang, Rui Yan, Yanan Liu, He Li, Yanxi Jin, Meng Li, Yuqing Tao, RiZhu Chen, Qianghua Wang, Xuguang Zhao, Bo Xie, Danping South China Institute of Environmental Sciences Ministry of Ecology and Environment Guangzhou510655 China State Environmental Protection Key Laboratory of Water Environmental Simulation and Pollution Control South China Institute of Environmental Sciences Ministry of Ecology and Environment Guangzhou510655 China

The occurrence of Contaminants of Emerging Concern (CECs) in the Pearl River was characterized using a nontarget screening (NTS) strategy combining both data dependent and data independent acquisition techniques. Our analysis identified 620 unique compounds, including pharmaceuticals (137), pesticides (124), industrial materials (68), personal care products (32), veterinary drugs (27), plasticizers or flame retardants (11), etc. Out of these compounds, 40 CECs were found with a detection frequency of over 60%, including diazepam, a well-known drug to treat anxiety, insomnia, convulsion, etc., which had the highest detection rate at 98%. Risk quotients (RQs) were calculated for level 1 CECs and showed that 12 CECs had RQs greater than 1, with notable concern for pretilachlor (detection frequency: 48%;0.8-19.0 ng/L), bensulfuron-methyl (86%, 3.1-56.2 ng/L), imidacloprid (80%, 5.3-62.8 ng/L) and thiamethoxam (86%, 9.1-99.9 ng/L), which had problematic occurrences (RQ>1) at 46-80% of sampling sites. Additionally, tentative identification of potential structurally related compounds provided valuable insight into the parent-product relationships in complex samples. This study underscores the significance and urgency of using NTS for CECs in the environment and presents a novel data sharing approach, which makes it easier for other scientists to evaluate, delve deeper, and perform retrospective analyses. © 2023, The Authors. All rights reserved.

关键词： Flame retardants

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A Web Service Framework to Identify Multiple pollutions in Potential Contaminated Sites Based on Mobile Application and Mixture-of-Experts Network

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SSRN 2024年

作者： Lu, Xiaosong Du, Junyang Zhang, Ya Wang, Guoqing Li, Xuzhi Sun, Li Huang, Xinghua State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control Nanjing Institute of Environmental Sciences Ministry of Ecology and Environment Nanjing210042 China College of Environmental Science and Engineering Yangzhou University Yangzhou225127 China

The traditional site environmental investigation mainly adopts manual filling in paper forms, which have limitations in timeliness, standardization, and accuracy. In addition, although machine learning has made progress in the prediction and evaluation of site pollution in recent years, there are still issues such as high model management costs and low accuracy in predicting complex pollution types. To rapidly identify multiple pollution types of soil and groundwater in potential contaminated sites, the mobile application and multi-gate mixture-of-experts (MMoE) were used to design a web service framework for site investigation and pollution identification (WEB-SIPI). The core of this technical framework is real-time collection of site environmental data and efficient prediction of multiple pollution types. A five-step strategy in this framework is designed, including: task management, information collection, data storage and processing, modeling and evaluation, as well as pollution identification and result display. Based on the above strategy, we developed a prototype system that supports administrators in managing users, sites, and models, while also enabling investigators to carry out real-time collection of site information using mobile application. Finally, a case study was constructed to verify the framework's feasibility and capability. We use 199 site datasets from key industries and 12 pollution identification indexes on WEB-SIPI system to train and deploy the MMoE model. The accuracies of soil heavy metals and organic pollution identifications were 70.0% and 82.5%, that of groundwater pollutions were 67.5% and 85.0%, respectively. Based on the global and local interpretability method of the SHAP model, the driving factors of different pollution types on site can be identified. This study provides a reference for the development of intelligent systems aimed at site pollution prediction, as well as decision making related to soil and groundwater pollution p

关键词： groundwater pollution

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Ozone Production Sensitivity Analysis for the Chengdu Plain Urban Agglomeration Based on a Muti-Site and Two-Episode Observation

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SSRN 2024年

作者： Zhou, Ming Liu, Yuhan Lu, Keding Yu, Dan Li, Chunmeng Zhai, Tianyu Yang, Suding Tan, Zhaofeng Ma, Xuefei Li, Xin Dong, Huabin Zeng, Limin Chen, Shiyi Chen, Junhui Tan, Qinwen Song, Danlin Zhang, Xiaoling Zhang, Yuhang State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and Engineering Peking University Beijing China China Institute of Atomic Energy Beijing China Center for Environmental Metrology National Institute of Metrology Beijing China State Environmental Protection Key Laboratory of Vehicle Emission Control and Simulation Chinese Research Academy of Environmental Sciences Beijing China Sichuan Academy of Environmental Sciences Chengdu China Chengdu Academy of Environmental Sciences Chengdu China Plateau Atmosphere and Environment Key Laboratory of Sichuan Province School of Atmospheric Sciences Chengdu University of Information Technology Chengdu China

Chengdu Plain Urban Agglomeration (CPUA) is one of the most serious areas suffering ozone pollution in China. A comprehensive field observation focused on the ozone production rate and its sensitivity was conducted at CPUA in the summer of 2019. Six sampling sites were set and two ozone pollution episodes were recognized. The daily maximum 8-h average (MDA8) O3 concentration reached 137.9 ppbv in the urban sites during the ozone pollution episode. Peak concentration of O3 was closely related to intense solar radiation, high temperatures, and precursor emissions. The OH-HO2-RO2 radical chemistry and ozone production rate (P(O3)) was calculated using an observation-based model (OBM). The daily peak OH concentration varied in the range of 3-13×106 molecules cm−3, and peak HO2 and RO2 were in the range of 2–14×108 molecules cm−3 during ozone pollution episodes. During the ozone pollution episode, the average maximum of P(O3) in suburban sites (about 30 ppbv h-1.) was compared with urban sites, and the maximum of P(O3) was 18 ppbv h-1 in rural sites. The relative incremental reactivity (RIR) results demonstrate that it was a VOC-limited regime in the central urban area of Chengdu, with NOx suppression effect in some regions. In the southern neighboring suburb of Chengdu, it was VOC-limited as well. However, the northern suburban area was a transition region. In the remote rural areas of the southern CPUA, it was highly NOx-limited. Local ozone production driven by the photochemical process is crucial to the ozone pollution formation in CPUA. The geographically differentiated recognition of the ozone regime found by this study can help to tailor control strategies for local conditions and avoid the negative effects of a one-size-fits-all approach. © 2024, The Authors. All rights reserved.

关键词： Molecules

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Ecological Mechanisms of Carbon Sequestration in Vegetated Coastal Wetland Ecosystem: Exploring the Roles of Biodiversity and environmental Changes

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Journal of Marine environmental Engineering 2025年第1期12卷 35-47页

作者： Liu, Lele Du, Ning Eller, Franziska Ye, Siyuan Li, Xiaowen Wei, Jifang Guo, Yaolin Brix, Hans Guo, Weihua Key Laboratory of Ecological Prewarning Protection and Restoration of Bohai Sea Ministry of Natural Resources School of Life Sciences Shandong University 72 Binhai Road Qingdao266237 China Department of Biology Aarhus University Ole Worms Alle 1 Aarhus8000 Denmark Key Laboratory of Coastal Wetland Biogeosciences Qingdao Institute of Marine Geology China Geological Survey Qingdao266000 China School of Environment State Key Joint Laboratory of Environment Simulation and Pollution Control Beijing Normal University Beijing100875 China North China Sea Ecological Center of the Ministry of Natural Resources Qingdao266000 China Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering National Observations and Research Station for Wetland Ecosystems of the Yangtze Estuary Institute of Biodiversity Science and Institute of EcoChongming School of Life Sciences Fudan University Shanghai200433 China

Vegetated coastal wetlands, also called blue carbon ecosystems, are significant carbon sinks that play a vital role in global climate change mitigation. Understanding the ecological mechanisms of carbon sequestration in these ecosystems is essential to effectively manage and conserve them. This review focuses on macroecological mechanisms of carbon transfer and microecological mechanisms of carbon stabilization in vegetated coastal wetland ecosystems. Macroecological mechanisms include the horizontal and vertical carbon transport coupled to plant ecophysiology and community diversity, while microecological mechanisms include processes related to soil organic matter dynamics, such as decomposition, stabilization, and mineralization. key scientific issues surrounding these mechanisms include transformation between carbon sink and source, stabilization mechanisms of organic carbon, and environmental effects at multiple time scales. A comprehensive research framework is also presented, which integrates spatial-temporal pattern, macroecological mechanism, microecological mechanism, and ecological engineering. Addressing these key scientific questions within the proposed framework can provide valuable insights into the significant role of biodiversity in blue carbon ecosystems, as well as significant implications for management and conservation of vegetated coastal wetlands under global climate changes. © 2025 Old City Publishing, Inc.

关键词： Ecosystems

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Pore-Scale Visualization of Napl Displacement by Chemical Agents in Heterogeneous groundwater System

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SSRN 2024年

作者： Li, Yan Long, Tao Li, Hangyu Wang, Xiaopu State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control Nanjing Institute of Environmental Sciences Ministry of Ecology and Environment Nanjing210042 China Shandong Qingdao266580 China Shandong Qingdao266580 China

The presence of non-aqueous phase liquids (NAPLs) like crude oil in groundwater systems is a major environmental concern. Conventional remediation methods often fail to remove NAPLs from low-permeable regions due to subsurface heterogeneity. Surfactants, like Tween80, are commonly used to enhance remediation;however, concerns about their toxicity and resulting secondary contamination remain. This study explored the use of a green bio-derived solvent and several other oil displacing agents for NAPL remediation. Two structurally different heterogeneous micromodels were designed and fabricated to mimic the longitudinal section of the heterogeneous regions of natural aquifers. The results indicated that the heterogeneity of porous media could significantly influence the displacement process and final results. Generally, the injection fluid preferred to flow through the high permeable area with larger pore size and lower flow resistance, resulting less residual oil compared to the low permeable area under various experimental conditions, with an average difference in residual oil saturation of 56.76%. Besides, the bio-solvent could effectively mobilize and remove NAPL residuals from low permeable zones, improving the efficiency of remediation by 30-45%, compared with other agents. Our findings suggest that the bio-solvent is a promising, environmentally-friendly alternative chemical agent for in situ NAPL remediation, offering improved efficiency and reduced secondary pollution. © 2024, The Authors. All rights reserved.

关键词： Solvents

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Assessing the Impacts and environmental Risks of Landfill Leachate on Adjacent groundwater Systems

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SSRN 2023年

作者： Huang, Zhi Liu, Guijian Zhang, Yifan Yuan, Ying Xi, Beidou Tan, Wenbing School of Earth and Space Sciences University of Science and Technology of China Hefei230026 China Anhui Academy of Ecological and Environmental Sciences Hefei230061 China State Key Laboratory of Environmental Criteria and Risk Assessment and State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution Chinese Research Academy of Environmental Sciences Beijing100012 China College of Water Sciences Beijing Normal University Beijing100875 China CAS Key Laboratory of Crust-Mantle Materials and the Environments

Landfilling is a globally prevalent method for managing municipal solid waste disposal. Nonetheless, contamination and regional disparities in the leachate produced pose varying degrees of risks to groundwater quality. Prior research has predominantly focused on the leachate and groundwater attributes of singular landfills or those within identical geoclimatic contexts. Only a few studies have conducted sampling and analysis from landfills situated in regions with dense topographic climates. Therefore, this study leveraged the transitional location of Anhui between the northern and southern parts of China, encompassing a range of climates and topographies. Sampled and analyzed the physical and chemical properties of leachate and adjacent groundwater from 62 landfills. Findings indicate that pollutant profiles in different media are influenced by the age, size, and operational status of the landfill, and the impact of leachate on pollutants types and concentrations in groundwater is limited. Inorganic nonmetallic indicators, along with sensory and physicochemical composite indicators, exhibited significant variations correlating with landfill age. Metal and metalloid concentrations generally displayed an upward trend with landfill age and at higher concentrations in leachate than in groundwater. And the environmental risks posed by different pollutants vary across environmental media. Total dissolved solids and NH4+ in leachate presented high environmental risks, whereas elemental metalloids (Mn, Al, Ba, and Fe) in the surrounding groundwater posed high environmental concerns. These insights furnish new avenues for monitoring, identification, and safeguarding against pollutants in landfills and proximate groundwater, which is imperative for the sustainable management of municipal waste. © 2023, The Authors. All rights reserved.

关键词： groundwater

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Regulating the Anchoring Structure to Enhance Thermostability of Ru Sub-Nano Clusters on Al-Based Supports for Efficient C–O Bonds Hydrogenolysis

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SSRN 2025年

作者： Xiao, Hongfei Zhang, Jianghao Ge, Shuchao Du, Chuo Jin, Yifan Xie, Yuanyuan Gai, Chao Fang, Jinhou Zhang, Changbin State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-environmental Sciences Chinese Academy of Sciences Beijing100085 China University of Chinese Academy of Sciences Beijing100049 China Weifang Research Institute of Materials and Technology for Eco-environmental Protection Shandong Weifang261300 China

Heterogeneous catalyst with highly dispersed active metal species has found wide applications in the catalytic conversion of lignocellulosic biomass, owing to the inherent advantages in metal atom efficiency. However, it is still confronted with the challenge for developing efficient strategies to achieve enhanced thermostability of the highly dispersed metal under harsh conditions. In this work, Ru species are supported on two different aluminum-based materials (i.e., γ-AlOOH and γ-Al2O3) that provide distinct anchoring sites for Ru. Complementary characterizations combined with theoretical calculations demonstrate that, compared with triply bridging Al-O site of γ-Al2O3, the doubly bridging Al-O site of AlOOH exhibits more intense electronic interaction with Ru species. Consequently, this doubly bridging Al-O site as the anchoring site provides sufficient thermal resistance to immobilize the sub-nanometer Ru species under the high-temperature aging condition. The maintained high dispersion of Ru on AlOOH creates an electron-deficient Ru domain and sustains the high activity and selectivity in the production of aromatics during the hydrotreating of diphenyl ether. This work may contribute to the catalyst design for manipulating the surface-anchoring structure to regulate thermostability and dispersion of supported metal catalysts. © 2025, The Authors. All rights reserved.

关键词： Hydrolysis

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