检索结果-内蒙古大学图书馆

Molecular Characteristics of Sea Spray Aerosols During Aging

学校读者我要写书评

暂无评论

SSRN 2024年

作者： Ma, Xueqi Li, Kun Zhang, Shan Tchinda, Narcisse Tsona Li, Jianlong Herrmann, Hartmut Du, Lin Qingdao Key Laboratory for Prevention and Control of Atmospheric Pollution in Coastal Cities Environment Research Institute Shandong University Qingdao266237 China School of Environmental Science and Engineering Shandong University Qingdao266237 China Leipzig04318 Germany

Sea spray aerosols (SSAs) are one of the largest natural sources of aerosols globally, known to affect the earth’s radiation budget and to play a pivotal role in air quality and climate. The physical and chemical properties of organic components in SSA change during long-distance atmospheric transport over the ocean. To characterize the evolution of organic components during the aging process of SSA, in this study, we use a flow reactor to simulate the oxidation processes of SSA produced by authentic seawater via OH radicals (in the presence of organic gases evaporated from seawater) and to present the molecular signatures of the nascent and aged SSA. We found, under our experimental conditions, that oxidation of headspace organic gases during aging leads to significant formation of new particles, and changes in the chemical constituents of SSA. In the nascent and aged SSA samples, we retained 129 and 340 products, respectively. The formation of high O/C and low carbon-number products was observed during the aging process, corresponding to functionalization and fragmentation reactions. Moreover, the significant contributions of N2 and O5S1 compounds in aged SSA were observed for the first time, which can be attributed to the accretion reaction driven by OH heterogeneous oxidation and the formation of organic sulfur compounds, respectively. These findings provide additional insights into the atmospheric transformation of organic components in marine aerosols, which is important for understanding the global carbon cycle. © 2024, The Authors. All rights reserved.

关键词： Budget control

燃烧源氨排放对灰霾期间北京大气铵的重要贡献

学校读者我要写书评

暂无评论

Science Bulletin 2024年第7期69卷 978-987页

作者：吴礼彬王芃张强任红 Zongbo Shi 胡伟陈静谢巧蓉李林杰越思瑶韦莲芳宋琳琳张永根王子涵陈爽韦琬王小曼章炎麟孔少飞葛宝珠杨婷方运霆任露洁邓君俊孙业乐王自发张宏亮胡建林刘丛强 Roy M.Harrison Qi Ying 傅平青 Institute of Surface-Earth System Science School of Earth System ScienceTianjin UniversityTianjin 300072China Department of Atmospheric and Oceanic Sciences Fudan UniversityShanghai 200438China IRDR ICoE on Risk Interconnectivity and Governance on Weather/Climate Extremes Impact and Public Health Fudan UniversityShanghai 200438China Ministry of Education Key Laboratory for Earth System Modeling Department of Earth System ScienceTsinghua UniversityBeijing 100084China Air Environmental Modeling and Pollution Controlling Key Laboratory of Sichuan Higher Education Institute Chengdu University of Information TechnologyChengdu 610225China Division of Environmental Health&Risk Management School of GeographyEarth&Environmental SciencesUniversity of BirminghamBirmingham B152TTUK School of Environmental Science and Engineering Tianjin UniversityTianjin 300072China State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Key Laboratory of Forest Ecology and Management Institute of Applied EcologyChinese Academy of SciencesShenyang 110164China Yale-NUIST Center on Atmospheric Environment International Joint Laboratory on Climate and Environment ChangeNanjing University of Information Science and TechnologyNanjing 210044China Department of Atmospheric Sciences School of Environmental Studies and Department of Environmental Science and TechnologySchool of Environmental StudiesChina University of GeosciencesWuhan 430074China Department of Environmental Science and Engineering Fudan UniversityShanghai 200438China Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution ControlNanjing University of Information Science and TechnologyNanjing 210044China Department of Environmental Sciences/Center of Excellence in Environmental Studies King Abdulaziz UniversityJeddah 21589Saudi Arabia Zachr

Aerosol ammonium(NH_(4)^(+)),mainly produced from the reactions of ammonia(NH_(3))with acids in the atmosphere,has significant impacts on air pollution,radiative forcing,and human *** the source and formation mechanism of NH_(4)^(+)can provide scientific insights into air quality ***,the sources of NH_(3)in urban areas are not well understood,and few studies focus on NH_(3)/NH_(4)^(+)at different heights within the atmospheric boundary layer,which hinders a comprehensive understanding of aerosol NH_(4)^(+).In this study,we perform both field observation and modeling studies(the Community Multiscale Air Quality,CMAQ)to investigate regional NH_(3)emission sources and vertically resolved NH_(4)^(+)formation mechanisms during the winter in *** stable nitrogen isotope analyses and CMAQ model suggest that combustion-related NH_(3)emissions,including fossil fuel sources,NH_(3)slip,and biomass burning,are important sources of aerosol NH_(4)^(+)with more than 60%contribution occurring on heavily polluted *** contrast,volatilization-related NH_(3)sources(livestock breeding,N-fertilizer application,and human waste)are dominant on clean ***-related NH_(3)is mostly local from Beijing,and biomass burning is likely an important NH_(3)source(~15%–20%)that was previously *** effective control strategies such as the two-product(e.g.,reducing both SO_(2)and NH_(3))control policy should be considered to improve air quality.

关键词： Particulate ammonium Nitrogen isotope PM2.5 The Community Multiscale Air Quality(CMAQ) control policy

Low Methane Emissions from the Natural Gas Distribution System Indicated by Mobile Measurements in a Chinese Megacity Hangzhou

学校读者我要写书评

暂无评论

ACS ES&T Air

ACS ES&T Air 2024年第12期1卷 1511-1518页

作者： Shuang Zhao Yuzhong Zhang Ruosi Liang Wei Chen Xinchun Xie Rui Wang Zheng Xia Jiandong Shen Yilong Wang Huilin Chen Key Laboratory of Coastal Environment and Resources of Zhejiang Province School of Engineering Westlake University Hangzhou 310024 China Institute of Advanced Technology Westlake Institute for Advanced Study Hangzhou 310024 China College of Environmental and Resource Sciences Zhejiang University Hangzhou Zhejiang 310058 China Zhejiang Ecological and Environmental Monitoring Center Hangzhou 310012 China Zhejiang Key Laboratory of Ecological and Environmental Monitoring Forewarning and Quality Control Hangzhou 310012 China Hangzhou Ecological Environment Monitoring Center of Zhejiang Province Hangzhou 310020 China State Key Laboratory of Tibetan Plateau Earth System Resources and Environment (TPESRE) Institute of Tibetan Plateau Research Chinese Academy of Sciences Beijing 100101 China Joint International Research Laboratory of Atmospheric and Earth System Sciences School of Atmospheric Sciences Nanjing University Nanjing 210023 China

The consumption of natural gas (NG) in China has quadrupled over the past decade. However, there is an absence of measurement-based assessment of methane emissions from NG consumption, including those from the urban distribution network. Here, we conducted a mobile survey with concurrent measurements of ambient methane concentrations, carbon dioxide concentrations, and13CH4isotopic signatures in the center and suburban areas of Hangzhou, a megacity in East China, from November 2021 to June 2022. We detected 176 leak indications in the 1408 km road covered with 32% attributed to NG leaks based on the source isotopic signature and the methane-to-carbon dioxide ratio derived from the Keeling plot and measured concentrations. We quantified the flux using Weller’s empirical equation, which yielded an emission factor of 115 L·d–1·km–1in Hangzhou. The value ranges from 16 to 314 L·d–1·km–1by accounting for various uncertainty sources. This emission factor falls on the lower end compared to previous studies conducted in North American and European cities. Our findings confirm the effectiveness of mobile surveys in detecting methane emission sources in urban China.

关键词：

Improvement of Low-Temperature Nh3-Scr Activity Over Cevo4 Modified by Sm

学校读者我要写书评

暂无评论

SSRN 2024年

作者： Li, Yingjie Du, Jinpeng Lin, Chunxi Lin, Jinhan Liu, Jianqi Cai, Jieying Liu, Congwei Center for Excellence in Regional Atmospheric Environment Key Laboratory of Urban Pollutant Conversion Institute of Urban Environment Chinese Academy of Sciences Xiamen361021 China Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control Ningbo Urban Environment Observation and Research Station Institute of Urban Environment Chinese Academy of Sciences Ningbo315800 China University of Chinese Academy of Sciences Beijing100049 China College of Engineering Eastern Institute for Advanced Study Ningbo315201 China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China

In this study, CeSmVO4 catalysts were prepared using the coprecipitation method. The Ce0.8Sm0.2V catalyst exhibited excellent NH3-SCR activity in a wide temperature window range of 175 oC to 375 oC, even under a high GHSV of 200,000 h-1. Analysis using XRD, Raman, and BET techniques revealed that doping Sm into CeVO4 enlarged the surface area and reduced the crystallite size of the catalyst. The H2-TPR and XPS results indicated that the incorporation of Sm improved the redox ability and enhanced the interaction among Ce, Sm, and V. NH3-TPD results demonstrated that the introduction of Sm into CeVO4 resulted in an increase in the number of acid sites. All these factors contributed significantly to the enhancement of low-temperature NH3-SCR reaction activity. Moreover, the addition of Sm could increase the number of Lewis acid sites, enhance the adsorption of NOx species, and promote the formation of -NH2 species and NH4NO3 species, which play a vital role in enhancing the SCR activity. The NH3-SCR reaction on the Ce0.8Sm0.2V catalyst followed both Langmuir-Hinshelwood and Eley-Rideal mechanisms. © 2024, The Authors. All rights reserved.

关键词： Temperature

Responses of Microcystis aeruginosa to polystyrene microplastics: Growth dynamics and implications for water treatment

学校读者我要写书评

暂无评论

Journal of Hazardous Materials 2025年 494卷 138650页

作者： Liu, Decai Zhang, Zhiyong Xu, Lei Fu, Ming-Lai Sun, Wenjie Yuan, Baoling Xiamen Key Laboratory of Municipal and Industrial Solid Waste Utilization and Pollution Control College of Civil Engineering Huaqiao University Fujian Xiamen361021 China Key Laboratory of Songliao Aquatic Environment Ministry of Education Jilin Jianzhu University Changchun130118 China Center for Water and Ecology State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China Department of Atmospheric and Hydrologic Science St. Cloud State University 720 4th Avenue South St. Cloud MN56301 United States

The understanding of microplastics (MPs) has advanced significantly with their accumulation in aquatic environments, but their potential impact on cyanobacterial blooms remains inadequately understood. Herein, the dynamic fluctuating effects of polystyrene (PS) on Microcystis aeruginosa were investigated throughout its growth cycle, as well as the action of algal organic matter in the disinfection by-products formation. The maximum inhibition of algal cell growth and phycobiliprotein content by PS during the adaptation phase reached 56.3 % and 76.3 %, respectively. With the extension of exposure time, the inhibitory effect gradually transitions into promotive effect. PS exposure increased the content of extracellular organic matter and enhanced the THMs formation during chlorination, with trihalomethanes concentrations of 62.8 and 101.9 μg/L in the control and PS treatment groups, respectively. Moreover, the reactive oxygen species levels in PS-exposed algal cells were only 71.5 % of those in the control group, and total antioxidant capacity levels, superoxide dismutase and catalase activities were also lower. However, the microcystin content exposed PS was increased to 1.2 times that of the control group. The presence of PS in aquatic environments increases the levels of algal organic matter and microcystin, potentially threatening water quality. This study provides new insights into the combined effects of microplastics on freshwater algae and valuable data on potential risk associated with MPs. © 2025 Elsevier B.V.

关键词： Cell growth

Micropores can enhance intrinsic fracture energy of hydrogels

学校读者我要写书评

暂无评论

arXiv

arXiv 2024年

作者： Cao, Puyu Chen, Bin Cao, Yi Gao, Huajian Department of Engineering Mechanics Zhejiang University Hangzhou China Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province Hangzhou China School of Physics Nanjing University Nanjing China Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control School of Environmental Science and Engineering Nanjing University of Information Science & Technology Nanjing210044 China Mechano-X Institute Applied Mechanics Laboratory Department of Engineering Mechanics Tsinghua University Beijing100084 China

It is widely known that hydrogels, a class of soft materials made of a polymer chain network, are prone to fatigue failure. To understand the underlying mechanism, here we simulate polymer scission and fatigue initiation in the vicinity of a crack tip in a two-dimensional chain network. For a network without pores, our findings reveal that polymer scission can take place across multiple layers of chains, rather than just a single layer as assumed in the classical Lake-Thomas theory, in consistency with previus studies. For a network with a high density of micropores, our results demonstrate that the pores can substantially enhance the intrinsic fracture energy of the network in direct proportion to the pore size. The underlying mechanism is attributed to pore-pore interactions which lead to a relatively uniform distribution of cohesive energy ahead of the crack tip. Our model suggests that micropores could be a promising strategy for improving the intrinsic fracture energy of hydrogels and that natural porous tissues may have evolved for enhanced fatigue resistance. Copyright © 2024, The Authors. All rights reserved.

关键词： Crack tips

UV/H2O2 oxidation of tri(2-chloroethyl) phosphate: Intermediate products, degradation pathway and toxicity evaluation

学校读者我要写书评

暂无评论

Journal of environmental Sciences 2020年第12期32卷 55-61页

作者： Qiuyi Ji Huan He Zhanqi Gao Xiaohan Wang Shaogui Yang Cheng Sun Shiyin Li Yong Wang Limin Zhang School of Environment Nanjing Normal UniversityNanjing 210023China State Environmental Protection Key Laboratory of Monitoring and Analysis for Organic Pollutants in Surface Water Environment Monitoring Center of JiangsuNanjing 210036China State Key Laboratory of Pollution Control and Resources Reuse School of EnvironmentNanjing UniversityNanjing 210023China School of Environment Northeast Normal UniversityChangchun 130024China

Tri(2-chloroethyl) phosphate(TCEP) with the initial concentration of 5 mg/L was degraded by UV/H2O2 oxidation process. The removal rate of TCEP in the UV/H2O2 system was 89.1% with the production of Cl-and PO4^3- of 0.23 and 0.64 mg/L. The removal rate of total organic carbon of the reaction was 48.8% and the pH reached 3.3 after the reaction. The oxidative degradation process of TCEP in the UV/H2O2 system obeyed the first order kinetic reaction with the apparent rate constant of 0.0025 min^-1( R^2 = 0.9788). The intermediate products were isolated and identified by gas chromatography-mass spectrometer. The addition reaction of HO · and H2O and the oxidation reaction with H2O2 were found during the degradation pathway of 5 mg/L TCEP in the UV/H2O2 system. For the first time, environment risk was estimated via the "ecological structure activity relationships" program and acute and chronic toxicity changes of intermediate products were pointed out. The luminescence inhibition rate of photobacterium was used to evaluate the acute toxicity of intermediate products. The results showed that the toxicity of the intermediate products increased with the increase of reaction time, which may be due to the production of chlorine compounds. Some measures should be introduced to the UV/H2O2 system to remove the highly toxic Cl-containing compounds, such as a nanofiltration or reverse osmosis unit.

关键词： Tri(2-chloroethyl)phosphate(TCEP) UV/H2O2 Mechanisms Toxicity evaluation

Optimization of Operating Parameters of Short-Cut Nitrification and Denitrification Process of Coal Pyrolysis Wastewater

学校读者我要写书评

暂无评论

SSRN 2023年

作者： Huang, Weiliang Wan, Ning Shi, Jingxin Yujie, Tang Liu, Jingchun Hao, Hu Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology School of Environmental Science and Engineering Nanjing University of Information Science & Technology Nanjing210044 China School of Applied Meteorology Nanjing University of Information Science & Technology Nanjing210044 China State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology Harbin150090 China Harbin Institute of Technology China

Phenolic compounds and nitrogen in coal pyrolysis wastewater has become a limiting factor for industrial development, creating conflicts with the principles of sustainability and environmental protection. While denitrification technologies for municipal wastewater have been well-established, research on short-cut denitrification for coal pyrolysis wastewater remains relatively limited. By controlling operational parameters, the study aimed to investigate the effects of different pH levels, Dissolved Oxygen (DO), and external carbon sources on short-cut denitrification for coal pyrolysis wastewater. Under conditions of adequate alkalinity, changes in pH had no significant impact on Nitrogen Accumulation Ratio (NAR) and Total Nitrogen (TN) removal ratios. When DO concentrations were controlled within the range of 2.0 to 4.0 mg/L for 5 days, NAR gradually decreased, indicating that operating the reactor at lower DO concentrations was more conducive to maintaining higher NAR levels. When the COD ratio of methanol to crude phenol was 1:1 and 1:3, the denitrification ratios were 5.13 mg NO2--N/ (g vss∙h) and 3.94 mg NO2--N/ (g vss∙h), respectively. When only crude phenol was used as an external carbon source with a C/N ratio of approximately 4, TN removal efficiency reached 90.32%. However, the denitrification ratio decreased to 1.66 mg NO2--N/ (g vss∙h). The Gas Chromatography Mass Spectrometry (GC-MS) analysis results indicated that phenol was the primary electron donor in the denitrification process of the system. © 2023, The Authors. All rights reserved.

关键词： Phenols

A Comprehensive Evaluation of Commercial Activated Carbon For key Gasoline Vapor Removal Based on the Improved Ahp Method

学校读者我要写书评

暂无评论

SSRN 2023年

作者： Hu, Wei Ren, Biqi Lu, Dan Li, Beibei Liu, Jia Liang, Wenjun Huang, Yuhu Key Laboratory of Beijing on Regional Air Pollution Control Faculty of Environment and Life Beijing University of Technology Beijing100124 China National Engineering Research Center of Urban Environmental Pollution Control Beijing Key Laboratory of Urban Atmospheric Volatile Organic Compounds Control Technology and Applications Beijing Municipal Research Institute of Eco-Environmental Protection Beijing100037 China

Adsorption technology is considered one of the most effective methods for removing volatile organic compounds (VOCs). However, it is difficult to select the optimal activated carbon(AC) for different VOCs industries due to its various categories. To develop a comprehensive assessment system for commercial AC in typical gasoline vapor removal, 12 commercial ACs (coal, shell, and wood carbon) were selected. Their physical properties, chemical characteristics and target pollutant adsorption capacity were studied. A comprehensive evaluation system was established based on the improved Analytic Hierarchy Process (AHP). The weighted of AHP method was determined by the correlation between adsorption capacity and each property indicator. The adsorption of i-pentane was influenced by the specific surface area （SSA） and alkaline functional groups of AC, with the former showing a significant positive correlation (correlation coefficient=0.853, P＜0.05) and the latter showing a negative correlation (correlation coefficient=-0.845, P＜0.05). Based on the average comprehensive scores, the wooden carbon performed the best, followed by the coal carbon and the shell carbon. Owing to the highest SSA (1851 m2/g) and the highest acidic functional groups (1.354 mmol/g) of the wooden carbon, the i-pentane adsorption performance (553.5 mg/g) was the best. The method we proposed can be used to rank the commercial AC based on the different aspects, which can be employed for the selection and recommendation of high-quality AC for various VOCs industries. © 2023, The Authors. All rights reserved.

关键词： Activated carbon