检索结果-内蒙古大学图书馆

Comparison of light absorption and oxidative potential of biodiesel/diesel and chemicals/diesel blends soot particles

引用

Journal of environmental Sciences 2020年第1期32卷 184-193页

作者： Yu Kuang Yi Guo Jiaqi Chai Jing Shang Jiali Zhu Svetlana Stevanovic Zoran Ristovski State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and Engineeringand Center for Environment and HealthPeking UniversityBeijing 100871China International Laboratoryfor Air Quality&Health(ILAQH) School of ChemistryPhysics and Mechanical EngineeringQueensland University of TechnologyBrisbaneQLD 4001Australia School of Engineering Faculty of Science Engineering&Built EnvironmentDe akin UniversityGeelong Waum Ponds CampusLocked Bag 20000GeelongVIC 3220Australia

Soot particles,mainly coming from fuel combustion,affect climate forcing through absorbing light and also result in adverse human health *** biodiesel or additives blending with diesel was considered environmentally friendly,the understanding on absorbing and oxidative capacity of soot emitted from them are still *** watersoluble organic carbon(WSOC)content,surface chemical structure,light absorption and oxidative potential(OPDTT)of soot from biodiesel/diesel and chemicals/diesel blends were investigated utilizing total organic carbon analyzer,X-ray photoelectron spectrometer,ultraviolet–visible spectrophotometry and dithiothreitol(DTT)*** differences and correlations between soot properties were statistically ***/diesel blends soot owned significantly higher WSOC content,ratio of mass absorbing efficiency(MAE)in250 and 365 nm(E2/E3),OPDTT,and higher surface carbonyl *** biodiesel/diesel blends soot contained evidently higher aromatic carbon–oxygen single bond(ArC–O)content,and higher *** individual comparison of biodiesel/diesel blends showed20%coconut biodiesel blend owned the lowest WSOC,E2/E3 and OPDTT,while highest ArC–O and MAE365,representing strongest absorbing *** analysis showed OPDTTwas significantly positively correlated with ***,the evident negative correlation between MAE365 and OPDTT was *** results showed coconut biodiesel/diesel blends soot induced lower levels of oxidative potential,whereas absorption of light was higher,which have far reaching consequences on climate ***,it is important to evaluate the balance point between light-absorbing properties and oxidative potential,under the wide use of biodiesel.

关键词： Soot particle Biodiesel Light absorption Mass absorbing efficiency Oxidative potential Dithiothreitol(DTT)

来源：评论

学校读者我要写书评

暂无评论

Synergistic regulation of nitrogen-doping environment and microporous structure in metal-free carbon catalyst enabling coupling effect on selective catalytic reduction of NO x with NH 3

引用

Carbon 2025年 243卷

作者： Xuhan Li Xiao Zhu Fei Sun Jingjie Wang Zhibin Qu Yanhui Xu Junfeng Li Guangbo Zhao Junhua Li School of Energy Science and Engineering Harbin Institute of Technology Harbin 150001 China State Key Laboratory of Low-carbon Thermal Power Generation Technology and Equipments Harbin 150001 China State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing 100084 China

Nanoscale pores and heteroatom dopants in metal-free carbon catalysts are essential functional units serving as mass transport channels and catalytic sites of reactants, respectively, for achieving NO x selective catalytic reduction with NH 3 (NH 3 -SCR). Existing studies have confirmed the positive impact of nitrogen dopants on enhancing catalytic activity, but the changes in pore topology (micropores or hierarchical pores) and their coupling effect with doping sites are still unclear. Here, we for the first time unveil the coupling interaction between nitrogen dopants and pore topology using model carbon catalysts with adjustable pore configurations and doping environment. Dynamic experiments indicate that for the undoped carbon, the hierarchical porous carbon delivers higher NO x conversion relative to the single microporous carbon, which is attributed to the rapid mass transfer of meso-/macropores, as confirmed by numerical simulations. However, for the nitrogen-doped carbon, the nitrogen-rich microporous carbon (NMAC-MW) demonstrates the highest NO x conversion (90 % at 160 °C with the weight hourly space velocity of 4000 mL g −1 h −1 ). Density functional theory calculations and in-situ characterizations reveal that nitrogen species switch reaction pathways from the standard NH 3 -SCR to the fast NH 3 -SCR and then couple the confinement effect of micropores to boost O 2 activation, ultimately promoting the NH 3 -SCR. This work offers insights into the multi-scale engineering of effective carbon catalysts for NO x removal.

关键词： Selective catalytic reduction

来源：评论

学校读者我要写书评

暂无评论

Anaerobic methane oxidation coupled with denitrification mitigates soil nitrous oxide emissions

引用

Science advances 2025年第24期11卷 eadv1410页

作者： Renfei Li Ying Yuan Beidou Xi Wenbing Tan 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 Beijing 100012 China. School of Environment Tsinghua University Beijing 100084 China.

The impact of anaerobic oxidation of methane (AOM) coupled with denitrification on the emission of the denitrification intermediate NO remains poorly understood. Here, we investigated the influence of AOM coupled with nitrate and nitrite reduction on soil NO emissions and the associated microbial interactions. We show that AOM coupled with denitrification markedly reduces soil NO emissions, with the type I methanotroph species collaborating with the Methylophilaceae and Gemmatimonadaceae families to perform key roles. The suppression of NO emissions by AOM primarily stems from its role in supplying electrons and carbon sources, fueling complete denitrification by associated bacteria. In addition, we uncovered distinct microbial interaction strategies for AOM-coupled nitrate and nitrite reduction. While nitrite reduction necessitates both bacterial cooperation and extracellular electron transfer during its initial stages, nitrate reduction predominantly depends on methanotrophic bacteria alone at the outset. These findings advance our understanding of carbon-nitrogen cycle coupling and underscore AOM's potential to simultaneously mitigate both CH and NO emissions.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Mos2/Au Heterojunction Nanostructures for Electrochemical Detection of Trace Hg(Ii) in Wastewater Samples

SSRN

引用

SSRN 2023年

作者： Zhao, Jiayin Zhao, Ke Zhang, Shuang Chang, Mengyu Wang, Yingcai Li, Xiaoyan Deng, Sheng Ge, Liya Lisak, Grzegorz Liu, Yuhui State Key Laboratory of Nuclear Resources and Environment East China University of Technology Jiangxi Nanchang330013 China Nanyang Environment and Water Research Institute Nanyang Technological University 1 Cleantech Loop CleanTech One 637141 Singapore School of Civil and Environmental Engineering Nanyang Technological University 50 Nanyang Avenue Singapore639798 Singapore State Key Laboratory of Groundwater Simulation and Pollution Control for Environmental Protection Chinese Research Academy of Environmental Sciences Beijing100012 China Departments of Radiation Oncology The University of Texas MD Anderson Cancer Center Houston77030 TX United States

In this study, a highly sensitive electrochemical sensor was developed for the detection of mercury ions in wastewater samples. The sensor was constructed using MoS2/Au heterojunction nanostructures, which involved depositing plasmonic Au nanoparticles onto MoS2 nanosheets on screen-printed carbon electrodes. The resulting MoS2/Au-SPCE sensor exhibited excellent electrochemical sensing performance due to the newly formed mid-gap state across the Fermi level, resulting from the hybridization between Au 5d and Mo 3d orbitals. This performance was superior to that of single Au nanoparticles and MoS2. The sensor showed high sensitivity in detecting Hg(II) ions with a wide linear range from 0.02 ppm to 0.0004 ppb and a LOD of 0.0004 ppb. The developed sensor was effectively applied for the detection of Hg(II) ions in factory wastewater and other samples. The MoS2/Au-SPCE sensor was successfully used to detect low concentrations of 565.0 ppb and 92.0 ppb Hg(II) in the investigated samples. This study provides a novel approach for the development of a highly sensitive electrochemical sensors for the detection of Hg(II) ions in various environmental samples by utilizing MoS2/Au heterostructures. © 2023, The Authors. All rights reserved.

关键词： Molybdenum compounds

来源：评论

学校读者我要写书评

暂无评论

Dynamic Modeling of the Sulfur Cycle in Urban Sewage Pipelines Under High-Temperature and High-Salt Conditions

SSRN

引用

SSRN 2024年

作者： Zhao, Bingxuan Xu, Zhen Fu, Qionglin Zhao, Xiangai Huang, Jinguang Chen, Yufeng Lian, Faqin Zhou, Jingya Department of Environmental Science College of Geography and Ocean Sciences Yanbian University Yanji133002 China College of Geography and Ocean Sciences Yanbian University Yanji133002 China Technology and Quality Department China MCC5 Group Co. Ltd. Chengdu610063 China College of Fisheries and Life Science Hainan Tropical Ocean University Sanya572022 China Key Laboratory of Biology and Genetic Resources of Tropical Crops Ministry of Agriculture Institute of Tropical Bioscience and Biotechnology Chinese Academy of Tropical Agricultural Sciences Haikou571101 China Center for Water and Ecology State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China

The corrosion of cement-based materials due to biological processes within the micro-ecological system of urban sewage pipeline networks poses a serious threat to their operation. Furthermore, saltwater is recognized as one of the most corrosive environmental agents. Hence, this study focuses on investigating the sewage dynamics within the anaerobic pipeline. Through observing characteristic changes of sewage within the system, we have optimized existing kinetic models to capture the sulfur cycling between the liquid phase, gas phase, and biofilm. The main objective is to address the unique environmental conditions of coastal cities and explore the dynamic interplay between various mathematical models representing biological reaction processes within the sewage pipeline network in this specific area. The findings indicate that under anaerobic conditions, high concentrations of sulfate in wastewater do not act as a limiting factor for sulfide oxidation reactions. On the contrary, when sulfate becomes part of the sulfur cycle process within the sewage pipeline, a certain concentration of sulfate in the wastewater actually enhances the sulfide oxidation reactions. This improved kinetic model enables us to predict the presence of sulfur under various conditions in tropical coastal cities, thereby providing insights into the extent of corrosion within sewage pipelines. © 2024, The Authors. All rights reserved.

关键词： Sewage

来源：评论

学校读者我要写书评

暂无评论

Effect of Tio2 Overlayer on Cuo-Cufeo2 Photocathode for Solar-Driven Electrochemical Degradation of Organic Pollutants

SSRN

引用

SSRN 2024年

作者： Lee, Juwon Haider, Zeeshan Byun, Eun-Kyung Ahn, Yong-Yoon Kim, Kitae Kim, Jae-Hyuk Son, Sang Hwan Jae, Jungho Kim, Jung Rae Cho, Kangwoo Zhang, Guan Kim, Hyoung-Il Department of Civil and Environmental Engineering Yonsei University Seoul03722 Korea Republic of Green Infrastructure Technology for Climate Change Yonsei University Seoul03722 Korea Republic of Department of Physics Incheon National University Incheon22012 Korea Republic of Incheon21990 Korea Republic of Department of Civil and Environmental Engineering Pusan National University Busan46241 Korea Republic of School of Chemical Engineering Pusan National University Busan46241 Korea Republic of Pohang37673 Korea Republic of State Key Laboratory of Urban Water Resource and Environment Shenzhen Key Laboratory of Organic Pollution Prevention and Control School of Civil and Environmental Engineering Harbin Institute of Technology Shenzhen Shenzhen518055 China Pohang37673 Korea Republic of

Producing hydroxyl radicals (•OH) through sustainable advanced oxidation processes (AOPs) is an effective method for managing emerging contaminants in wastewater. Herein, a novel and sustainable photocathode for a solar-driven electrochemical AOP (SEAOP) was developed, featuring a CuO-CuFeO2 photoactive inner layer and a TiO2 outer layer, facilitating rapid •OH formation via an oxygen reduction reaction at the photocathode, leading to the effective degradation of various organic pollutants. Introducing the TiO2 overlayer significantly boosted the •OH production kinetics of the CuO-CuFeO2 photocathode by hindering the side reaction between the in situ generated H2O2 consumption, without generating •OH, thereby enhancing the pollutant degradation capabilities. In-depth mechanistic analyses, including isotope (18O2) experiments, Electron spin resonance, and scavenger tests, offer crucial insights into the working of SEAOP, highlighting their potential for application in wastewater treatment. © 2024, The Authors. All rights reserved.

关键词： Titanium dioxide

来源：评论

学校读者我要写书评

暂无评论

Removal characteristics of microplastics by Fe-based coagulants during drinking water treatment

引用

Journal of environmental Sciences 2019年第4期31卷 267-275页

作者： Baiwen Ma Wenjing Xue Yanyan Ding Chengzhi Hu Huijuan Liu Jiuhui Qu Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental SciencesChinese Academy of Sciences College of Environment and Safety Engineering Qingdao University of Science and Technology University of Chinese Academy of Sciences School of Environment State Key Joint Laboratory of Environment Simulation and Pollution ControlTsinghua University Research Center for Water Quality and Ecology Tsinghua University

Microplastics have caused great concern worldwide recently due to their ubiquitous presence within the marine environment. Up to now, most attention has been paid to their sources,distributions, measurement methods, and especially their eco-toxicological effects. With microplastics being increasingly detected in freshwater, it is urgently necessary to evaluate their behaviors during coagulation and ultrafiltration(UF) processes. Herein, the removal behavior of polyethylene(PE), which is easily suspended in water and is the main component of microplastics, was investigated with commonly used Fe-based salts. Results showed that although higher removal efficiency was induced for smaller PE particles, low PE removal efficiency(below 15%) was observed using the traditional coagulation process, and was little influenced by water characteristics. In comparison to solution pH, PAM addition played a more important role in increasing the removal efficiency, especially anionic PAM at high dosage(with efficiency up to 90.9%). The main reason was ascribed to the dense floc formation and high adsorption ability because of the positively charged Fe-based flocs under neutral conditions. For ultrafiltration, although PE particles could be completely rejected,slight membrane fouling was caused owing to their large particle size. The membrane flux decreased after coagulation; however, the membrane fouling was less severe than that induced by flocs alone due to the heterogeneous nature of the cake layer caused by PE, even at high dosages of Fe-based salts. Based on the behavior exhibited during coagulation and ultrafiltration, we believe these findings will have potential application in drinking water treatment.

关键词： Microplastics Removal FeCl3·6H2O Coagulation Ultrafiltration

来源：评论

学校读者我要写书评

暂无评论

Assessment of Heavy Metal pollution in the Water, Sediment and Fish during a Complete Breeding Cycle in the Pond of the Pearl River Delta, China

引用

Journal of environmental Protection 2020年第6期11卷 509-530页

作者： Benjian Mao Zhiwei Huang Fantang Zeng Hongwei Du Huaiyang Fang Shu Lin Yuyu Zhang Lei Shi Guangdong Key Laboratory of Environmental Pollution and Health School of Environment Jinan University Guangzhou China National Key Laboratory of Water Environmental Simulation and Pollution Control Guangdong Key Laboratory of Water and Air Pollution Control South China Institute of Environmental Sciences Ministry of Environmental Protection of the People’s Republic of China Guangzhou China

The paper aimed to investigate the concentration variations and evaluate the bioaccumulation as well as the health risk of Cr, Ni, Cu, Zn, As, Cd and Pb in the aquaculture pond ecosystem during a complete breeding cycle. The samples of water, sediment and aquatic organisms were collected from the pond of gull island in the Pearl River Delta, China. In the breeding cycle, the results revealed the metal concentration in the water increased, while the sediment metal concentration showed no significant difference. The heavy metal concentrations in the water were higher than the background values (December 2017) which related to the input of feeds. Sediment metal concentrations (Cr, Ni, Cu, Zn, As and Cd) in the sediment were higher than the background values of Guangdong Province, China, indicating these metal pollutions came from anthropogenic activities. While the concentration of Pb was comparable to the background value, implying that the Pb was mainly from the earth crust. In addition, various metals showed different affinity to fish organs (muscle, skin, bladder, gill, heart, kidney and liver). Zinc was abundant in skin, while As and Cd concentrations were highest in kidneys;Cu was accumulated highest in liver;Cr concentrations was highest in hearts;and Ni was mainly found in bladders, and the Pb was most commonly found in gills. The distribution of heavy metals in the tissues organs was in the sequence of: Zn > Cu > Cr > Ni > Pb > As > Cd. As the fish ages, the Cu and Zn concentration in tissue organs declined, while the Cr, Ni, As, Cd and Pb increased slightly. Estimations of health risks showed no evidence of potential threats to consumers.

关键词： Heavy Metals Risk Assessment Breeding Cycle Grass Carp Fish Organs

来源：评论

学校读者我要写书评

暂无评论

A Great Achievement in Mitigation of Pm2.5 pollution in Cold Seasons in One of the World's Once Most Polluted Area: A Perspective Gained from Regional Observation

SSRN

引用

SSRN 2023年

作者： Chu, Yangxi Chi, Xiyuan Du, Jinhong Duan, Jingchun Chan, Chak K. Lu, Keding Yin, Lina Tan, Jihua Hu, Jingnan Chai, Fahe State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental Sciences Beijing100012 China National Meteorological Center of China Meteorological Administration Beijing100081 China Division of Physical Science and Engineering King Abdullah University of Science and Technology Thuwal23955-6900 Saudi Arabia State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and Engineering Peking University Beijing100871 China College of Resources and Environment University of Chinese Academy of Sciences Beijing101408 China

PM2.5 pollution has been greatly alleviated in Beijing-Tianjin-Hebei (BTH) and surrounding area since the implementation of Action Plans for Blue Skies in 2013. Regional air pollution covering multiple cities has recently become common, but an overview from a regional perspective is scarse. In this paper, based on PM2.5 chemical composition data collected in "2+26" cities during four consecutive autumn-winter seasons (AWS, from October to next March) from October 2016 to March 2020, we illustrated the distinct concentration increasing patterns of individual components as pollution aggravates, and identified the PM2.5 mass-driven component in different PM2.5 concentration regimes according to mass fraction calculations. Regionally, in the low PM2.5 regime (concentration ≤ 75 μg/m3), the PM2.5 mass remained organic matter (OM)-driven during the four AWSs. In the high PM2.5 regime (concentration > 75 μg/m3), regional PM2.5 increase pattern transformed from OM-driven during the 2016–2017 AWS to secondary inorganics-driven during the latter three AWSs, with nitrate becoming the dominant component, driving PM2.5 increase in almost 90% cities in the region. These transitions reflect the effectiveness of policies to control coal combustion emissions in recent years, but also highlight the need to reduce nitrogen oxide emissions from diesel vehicles and industry. Besides, the control of sulfur dioxide and primary organic matter should not be neglected, given the substantial contribution of PM2.5 sulfate under stagnant and humid meteorological conditions, especially in the geographically central and southern parts of the region, and the need for in-depth air quality improvement if the PM2.5 concentration standards are tightened. Considering the dominance of nitrate in driving regional PM2.5 pollution, more research on nitrate formation and its atmospheric and climatic impacts is warranted. © 2023, The Authors. All rights reserved.

关键词： Nitrates

来源：评论

学校读者我要写书评

暂无评论

Advancements in Amorphous Oxides For Electrocatalytic Carbon Dioxide Reduction

Materials Today Catalysis

引用

Materials Today Catalysis 2024年 7卷

作者： Meng, Youcai Ding, Junyang Liu, Yifan Hu, Guangzhi Feng, Yanhong Wu, Yinghong Liu, Xijun MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials School of Resources Environment and Materials Guangxi University Nanning530004 China Institute of Advanced Science Facilities Guangdong Shenzhen518107 China Institute for Ecological Research and Pollution Control of Plateau Lakes School of Ecology and Environmental Science Yunnan University Kunming650504 China National Engineering Research Center of Green Recycling for Strategic Metal Resources Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China Group Department of Health Sciences and Technology ETH Zürich Zürich8008 Switzerland

Electrocatalytic CO2 reduction (ECR) is a crucial energy conversion technology that transforms CO2 into value-added chemicals, reducing reliance on fossil fuels and advancing energy transitions. Designing high-performance catalysts is pivotal for widespread adoption of CO2 reduction reactions, aiming for high activity, selectivity, and stability. Amorphous oxides represent a burgeoning frontier in this field, attracting attention due to their abundant active sites that refine the catalyst structure-performance relationship. This paper aims to provide an overview of recent advances in using amorphous oxides for ECR. We begin by introducing the basic theory of electrocatalytic CO2 reduction, followed by discussing current synthesis approaches for amorphous oxides in CO2 reduction, focusing on optimization strategies for these catalysts. Finally, we address challenges and future perspectives of amorphous oxides in ECR, aiming to foster the development of more efficient catalyst designs. © 2024 The Authors

关键词： Catalyst selectivity

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：