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Effect of Nanoparticles and Nanosheets on Improving the Oil/Water Interface Performance of Surfactants in Enhancing Oil Recovery: A Comparative Study by Molecular simulation

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SSRN 2022年

作者： Fu, Lipei Gu, Feng Liao, Kaili Ma, Qianli Shao, Minglu Cheng, Yuan Huang, Weiqiu Li, Bing Si, Wenzhe School of Petroleum Engineering Changzhou University Changzhou213164 China State Key Joint Laboratory of Environment Simulation and Pollution Control National Engineering Laboratory for Multi Flue Gas Pollution Control Technology and Equipment School of Environment Tsinghua University Beijing100084 China The Key Laboratory of Well Stability and Fluid & Rock Mechanics in Oil and Gas Reservoir of Shaanxi Province Xi'an Shiyou University Xi'an710065 China Jiangsu Zhongchuang Qingyuan Technology Co. Ltd. Yancheng224000 China

In recent years, nanoparticles have become the most potential enhanced oil recovery technology due to their unique small size effect and specific surface area effect. With the research and application of graphene and its derived materials, nanosheets are the research hotspot of nanomaterials for enhanced surfactant flooding, but there is no report on the molecular simulation comparison of nanoparticles and nanosheets to enhance surfactant performance. Therefore, in this paper, we first constructed nano-SiO2 particles grafted with hydroxyl and pentyl alkane activator, graphene nanosheets grafted with carboxylic acid chain and pentyl alkane activator. On this basis, the interfacial tension, interfacial density, interfacial generation energy and radial distribution function were analyzed by molecular dynamics simulation. The results showed that both nanoparticles and nanosheets could produce synergistic effect with amphoteric surfactant dodecyl dimethylaminoethyllactone (BS-12), and the synergistic effect of nanosheets with BS-12 was stronger after carboxylic acid chain and pentyl alkane activator were grafted on the surface of nanosheets. The interfacial tension of n-dodecane/water can be reduced to 13.58 mN/m by the combination of modified nanoparticles and BS-12, while the interfacial tension of n-dodecane/water can be reduced to 4.15 mN/m by the combination of modified nanosheets and BS-12, which means that the ability of reducing oil-water interfacial tension is significantly improved. Second, the calculation of n-dodecane/water interface thickness and interface formation energy showed that compared with the modified nanoparticles and BS-12 compound system, the interface thickness of the modified nanoparticles and BS-12 compound system increased by 9.24%, and the interface formation energy increased by 17.85%. In addition, the results of radial distribution function analysis also showed that the modified nanosheets had strong hydration with water molecules after c

关键词： Distribution functions

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Efficient Hydrogenation of P-Chlorophenol and Cr(Vi) Driven by Hydrogen Rich Balls Over Pd/C Catalysts

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SSRN 2022年

作者： Niu, Junfeng Zhang, Yuanzheng Xu, Lei Pei, Yuansheng Niu, Junfeng Wang, Weilai Ministry of Education Key Laboratory for Yellow River and Huai River Water Environment and Pollution Control School of Environment Henan Normal University Henan Xinxiang453007 China State Key Laboratory of Water Environment Simulation School of Environment Beijing Normal University Beijing100875 China College of Environmental Science and Engineering North China Electric Power University Beijing102206 China Dongguan University of Technology China

Catalytic hydrogenation can selectively destabilize and detoxify specific contaminants in water. Guided by the adsorption-activation hydrogenation mechanism, carrier selection and active center construction have become the main content of hydrogenation catalyst research. However, this relies heavily by the development of new materials and technologies. Herein, from the perspective of hydrogen source, hydrogen rich balls (HRBs) were used to supply H2 for hydrogenating p-chlorophenol and Cr(VI) over Pd/C catalyst. The results showed that HRBs can realize the sustained release of H2 (14±2 µL/min·g) by replacing the hydrogen in water, and generate the refined (micro/nano-sized) H2 bubble, which effectively improves the adsorption and activation effectively of H2 molecules on Pd/C catalyst, and the hydrogen atoms utilization efficiency during p-chlorophenol hydrodechlorination is as high as 3.5%. Continuous flow experiments showed that rapid removal of p-chlorophenol with different concentrations could be achieved by adjusting the flow rate. Moreover, the high-toxic Cr(VI) was successfully reduced to the low-toxic Cr(III) by molecular hydrogen and active hydrogen in an appropriate pH range. This research is of far-reaching significance for realizing the detoxification of environmental pollutants and promoting the development of hydrogen economy. © 2022, The Authors. All rights reserved.

关键词： Atoms

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食品系统与气候变化、空气污染之间的相互作用综述（英文）

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Engineering 2025年第1期 215-233页

作者： Chaopeng Hong Rui Zhong Mengyao Xu Peidong He Huibin Mo Yue Qin Danna Shi Xinlei Chen Kebin He Qiang Zhang Shenzhen Key Laboratory of Ecological Remediation and Carbon Sequestration Institute of Environment and Ecology Shenzhen International Graduate School Tsinghua University State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex College of Environmental Sciences and Engineering Peking University Institute of Data and Information Shenzhen International Graduate School Tsinghua University State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Ministry of Education Key Laboratory for Earth System Modeling Department of Earth System Science Tsinghua University

Food systems are deeply affected by climate change and air pollution, while being key contributors to these environmental challenges. Understanding the complex interactions among food systems, climate change, and air pollution is crucial for mitigating climate change, improving air quality, and promoting the sustainable development of food systems. However, the literature lacks a comprehensive review of these interactions, particularly in the current phase of rapid development in the field. To address this gap, this study systematically reviews recent research on the impacts of climate change and air pollution on food systems, as well as the greenhouse gas and air pollutant emissions from agri-food systems and their contribution to global climate change and air pollution. In addition, this study summarizes various strategies for mitigation and adaptation, including adjustments in agricultural practices and food supply chains. Profound changes in food systems are urgently needed to enhance adaptability and reduce emissions. This review offers a critical overview of current research on the interactions among food systems, climate change, and air pollution and highlights future research directions to support the transition to sustainable food systems.

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Incorporating Catalytic Ceramic Membrane into the Integrated Process of in Situ Ozonation, Membrane Filtration and Biological Degradation: Enhanced Performance and Underlying Mechanisms

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SSRN 2022年

作者： Chen, Rong Zhang, Kai Wang, Hao Wang, Xiao-Mao Zhang, Xi-Hui Huang, Xia State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China Institute for Environmental Engineering & Nano-Technology Tsinghua Shenzhen International Graduate School Tsinghua University Guangdong 518055 China Beijing Drainage Group Co. Ltd Beijing100124 China Bgrimm Technology Group Beijing100160 China

The integrated process comprising of in situ ozonation, ceramic membrane filtration and biologically active carbon filtration has a bright application prospect in wastewater reclamation. Additionally, ceramic membranes of stronger catalytic activity are highly desirable so as to further increase the process cost-efficiency. In this study, a Mn-based catalytic membrane was tested by conducting pilot-scale experiments of the integrated process to measure its performance in enhancing pollutant removal and in alleviating membrane fouling. Lab-scale experiments were also conducted in order to investigate the underlying mechanisms in which the conventional Al2O3 membrane was used for comparison. Results showed that the integrated process with an incorporated catalytic membrane performed very well in that at a water flux as high as 80 L/m2/h and an ozone dosage of 5 mg/L, the treated water satisfied the guideline values for indirect potable reuse and membrane fouling was minimal. Reducing the ozone dosage to 4 mg/L can still achieve significant membrane fouling control effects, and maintain good effluent quality. Catalytic ozonation could lead to the generation of hydroxyl radicals, and the catalytic ozonation effect was much stronger when the catalytic membrane was used. Catalytic ozonation took place in both the membrane tank and membrane pores, with comparable contributions to the pollutant removal and membrane fouling control. Redundancy analysis (RDA) of membrane fouling characteristics showed that residual ozone concentration in membrane tank was an essential parameter and catalytic ozonation could be more effective in abating irreversible fouling than reversible fouling. RDA also confirmed that a lower ozone dosage would be sufficient for membrane fouling control when the catalytic membrane was used. This study evidently suggested the advantage of using catalytic ceramic membrane in the integrated process for efficient while economic treatment and reclamation of was

关键词： Manganese oxide

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Oxygen Vacancies-Mediated Cuo@N-Doped Carbon Nanocomposites for Non-Radical-Dominated Photothermal Catalytic Degradation of Contaminants

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SSRN 2022年

作者： Chen, Yi Dai, Yuntong Li, Yanwei Hou, Zexi Gao, Baoyu Yue, Qinyan Li, Qian Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse Shandong Key Laboratory of Environmental Processes and Health School of Environmental Science and Engineering Shandong University Qingdao266200 China Shenzhen Research Institute of Shandong University Shenzhen518057 China Environment Research Institute of Shandong University Qingdao266200 China

Efficient molecular oxygen activation (MOA) is a critical step for most environmental catalysis to generate reactive oxygen species (ROS), which is often limited by lack of energy to excite electrons. The emergence of photothermal catalyst provides an opportunity to make full use of solar energy to energize electrons for boosting activation of molecular oxygen. Herein, CuO nanoparticles wrapped into nitrogen-doped carbon nanocomposites (CuO@NCs) with abundant oxygen vacancies (OVs) were prepared by a facile one-step synthesis using carboxymethyl chitosan hydrogel as a template. The as-obtained CuO@NCs exhibit excellent photothermal catalytic properties under visible light irradiation to achieve efficient molecular oxygen activation, thus allowing effective degradation of bisphenol F (BPF) in complex aqueous environments and actual water matrices. The density functional theory (DFT) calculations reveal that both the enhanced properties of OVs for molecular oxygen adsorption and the accelerated properties of graphite N for electron transfer contribute significantly to the MOA and the charge separation efficiency, resulting in a large amount of ROS. Molecular oxygen was converted to superoxide (·O2-) and ultimately to singlet oxygen (1O2 ), which was the dominant ROS responsible for contaminants degradation. In addition, the photothermal catalytic degradation pathway of BPF was proposed according to the product detection and theoretical calculations. This work provides an effective method for the in-situ fabrication of metal@N-doped carbon nanocomposite photothermal catalysts and elucidates the mechanism of photothermal catalytic activation of molecular oxygen for contaminants degradation, providing a promising approach for making full use of solar energy for environmental remediation. © 2022, The Authors. All rights reserved.

关键词： Oxygen vacancies

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Fate and Toxic Effect of Triclocarban in Wastewater Treatment Systems

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SSRN 2022年

作者： Liang, Bin Wang, Hao Yun, Hui Li, Minghan Cui, Hanlin Ma, Xiaodan Zhang, Yanqing Pei, Xuanyuan Zhang, Liying Shi, Ke Li, Zhiling Wang, Aijie Zhou, Jizhong State Key Laboratory of Urban Water Resource and Environment School of Environment Harbin Institute of Technology Harbin150090 China Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations School of Life Sciences Lanzhou University Lanzhou730000 China State Key Laboratory of Urban Water Resource and Environment Shenzhen Key Laboratory of Organic Pollution Prevention and Control School of Civil & Environmental Engineering Harbin Institute of Technology Shenzhen Shenzhen518055 China Institute for Environmental Genomics Department of Microbiology and Plant Biology University of Oklahoma NormanOK73019 United States

Triclocarban (TCC), one of the typical antimicrobial agents, is a contaminant of emerging concern commonly found in high concentration in water environments. However, the fate and toxic effect of TCC in biological wastewater treatment systems, remain poorly understood. Here, we investigated how TCC impacts chemical oxygen demand and inorganic nitrogen transformation in a hydrolytic anaerobic-anoxic/oxic (HA-A/O) process. In the anaerobic section, the transformation of TCC was dominated by reductive dechlorination and supplemented by two amid bonds hydrolysis. In the anoxic and oxic sections, the hydrolysis of amid bonds dominated, accumulating a large amount of 3,4-dichloroaniline and reducing the toxicity of TCC after the treatment. Regarding the ammonia nitrogen, the removal was inhibited due to the TCC toxicity to nitrogen removal bacteria. Furthermore, the original ecological niche was gradually replaced by TCC-resistant/degradative bacteria, leading to the formation of new modules to resist the TCC stress. Importantly, fourteen genera including Methanosaeta, Longilinea, Dokdonella and Mycobacterium as potential bioindicators warning TCC and its intermediates were proposed. Overall, this study provides new insights into the fate of TCC in biological wastewater treatment systems and suggests a great importance for TCC control to ensure the health and resilience of water ecosystems. © 2022, The Authors. All rights reserved.

关键词： Toxicity

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Magnetotactic bacteria:Characteristics and environmental applications

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Frontiers of environmental Science & Engineering 2020年第4期14卷 3-16,F0004页

作者： Xinjie Wang Yang Li Jian Zhao Hong Yao Siqi Chu Zimu Song Zongxian He Wen Zhang State Key Laboratory of Water Environment Simulation School of EnvironmentBeijing Normal UniversityBeijing 100875China John A.Reif Jr.Department of Civil and Environmental EngineeringNew Jersey Institute of TechnologyNewarkNJ 07102USA Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard Beijing International Cooperation Base for Science and Technology on Antibiotics/Resistance Genes Water Environmental Pollution Control TechnologySchool of Civil EngineeringBeijing Jiaotong UniversityBeijing 100044China

Magnetotactic bacteria(MTB)are a group of Gram-negative prokaryotes that respond to the geomagnetic *** unique property is attributed to the intracellular magnetosomes,which contains membrane-bound nanocrystals of magnetic iron *** review summarizes the most recent advances in MTB,magnetosomes,and their potential applications especially the environmental pollutant control or *** morphologic and phylogenetic diversity of MTB were first introduced,followed by a critical review of isolation and cultivation *** have devoted to optimize the factors,such as oxygen,carbon source,nitrogen source,nutrient broth,iron source,and mineral elements for the growth of *** the applications of MTB in modem biological and medical fields,little attention was made on the environmental applications of MTB for wastewater treatment,which has been summarized in this *** example,applications of MTB as adsorbents have resulted in a novel magnetic separation technology for removal of heavy metals or organic pollutants in *** addition,we summarized the current advance on pathogen removal and detection of endocrine disruptor which can inspire new insights toward sustainable engineering and ***,the new perspectives and possible directions for future studies are recommended,such as isolation of *** modification of MTB for mass production and new environmental *** ultimate objective of this review is to promote the applications of MTB and magnetosomes in the environmental fields.

关键词： Magnetotactic bacteria Magnetosome Heavy metal Radionuclide Organic pollutants

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Enhancement of the degradation ability for organic pollutants via the synergistic effect of photoelectrocatalysis on a self-assembled perylene diimide (SA-PDI) thin film

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Science Bulletin 2019年第13期64卷 896-903页

作者： Hong Miao Jun Yang Guilong Peng Huiquan Li Yongfa Zhu Department of Chemistry Tsinghua UniversityBeijing 100084China School of Environment Beijing Key Laboratory for Emerging Organic Contaminants ControlState Key Joint Laboratory of Environment Simulation and Pollution Control (SKLESPC)Tsinghua UniversityBeijing 100084China Anhui Provincical Key Laboratory for Degradation and Monitoring of Pollution of the Environment School of Chemistry and Materials EngineeringFuyang Normal UniversityFuyang 236037China

A self-assembled perylene diimide(SA-PDI)film was prepared on an indium-tin-oxide(ITO)substrate and acted as a photoanode for the photoelectrocatalytic(PEC)degradation of some emerging contaminants under visible light irradiation(λ>420 nm)and applied *** to the synergistic effect,the photocatalytic degradation rate by the SA-PDI film under visible light irradiation and an applied voltage of 2.1 V was 2.72 times and 14.5 times those of the PC and EC processes,*** visible light irradiation not only generated a promoting effect on electrocatalytic(EC)oxidation at potentials above1.2 V but also generated many more h+ for promoting the electrocatalytic oxidation of ***,an applied voltage above 1.2 V could effectively improve the separation rate of electrons from the SA-PDI electrodes to the Pt electrodes,and then,much more ·O2-and ·OH could be generated for improving the photocatalytic(PC)oxidation ***,the h+,·OH and ·O2-could improve the synergistic effect of phenol oxidation during the PEC ***,the SA-PDI film appeared to have satisfactory stability in the PEC *** SA-PDI film was also proven to be effective for two other contaminants,namely,2,4-dichlorophenol,and ciprofloxacin.

关键词： Photoelectrocatalytic oxidation PDI electrode Phenol Degradation

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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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Reconstructing the Nanoscale Porous Structures in Coal-Based Membranes by Ultrafast High-Temperature Sintering for Solar-Driven Water Treatment

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SSRN 2023年

作者： Liu, Chih-Chin Chen, Rong Wei, Yanzhuo Huang, Yang Zhang, Zhijun Zhao, Yixin Fu, Tairan Hu, Chuxiong Huang, Xia Zang, Xining Department of Mechanical Engineering Tsinghua University Beijing100084 China Key Laboratory for Advanced Materials Processing Technology Ministry of Education Tsinghua University Beijing100084 China State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China Department of Thermal Engineering Tsinghua University Beijing100084 China School of Chemical and Environmental Engineering China University of Mining and Technology Beijing100083 China Key Laboratory for Thermal Science and Power Engineering Ministry of Education China Beijing Key Laboratory for Precise Mining of Inter grown Energy and Resources China

Lignite, a low-grade coal, accounts for over 40% of the global coal reserves. The use of lignite has been limited compared to other grades due to its low calorific value, high impurities content, and elevated volatile matter. Exploring a scalable and environment-friendly approach to upgrade lignite will offer new opportunities. In this work, Ultrafast High-Temperature Carbonization (UHC) has been developed to carbonize lignite and modify its nanoscale structure to construct a conductive porous membrane. The whole process takes only 30 s with an ultrafast heating rate exceeding 2400°C/min and a maximum temperature over 1500°C. Upon heating the pore structures in the coal membrane evolves into micro- and mesopores with a specific surface area of over 300 m2/g. The carbonized coal-based membrane provides superior performance as a solar evaporator for water treatment, due to its interconnected porous structures, hydrophilicity, and over 85% absorption of full-band visible light. Under 1 sun solar irradiation, the membrane shows over 98.2% removal rate of salts, heavy metal ions, and volatile organic compounds (VOCs). © 2023, The Authors. All rights reserved.

关键词： Metal ions

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