检索结果-南通市图书馆

Ceramic water filter for point-of-use water treatment in developing countries: Principles, challenges and opportunities

引用

Frontiers of environmental Science & Engineering 2020年第5期14卷 37-46页

作者： Haiyan Yang Shangping Xu Derek EChitwood Yin Wang SCNU environmental Research Institute Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety&MOE Key Laboratory of Theoretical Chemistry of EnvironmentSouth China Normal UniversityGuangzhou 510006China School of Environment South China Normal UniversityUniversity TownGuangzhou 510006China department of Geosciences University of Wisconsin-MilwaukeeMilwaukeeWI 53211USA department of Engineering Dordt UniversitySioux CenterIA 51250USA department of Civil and environmental Engineering University of Wisconsin MilwaukeeMilwaukeeWI 53211USA

Drinking water source contamination poses a great threat to human health in developing ***-of-use(POU)water treatment techniques,which improve drinking water quality at the household level,offer an affordable and convenient way to obtain safe drinking water and thus can reduce the outbreaks of waterbome *** water filters(CWFs),fabricated from locally sourced materials and manufactured by local labor,are one of the most socially acceptable POU water treatment technologies because of their effectiveness,low-cost and ease of *** review concisely summarizes the critical factors that influence the performance of CWFs,including(1)CWF manufacturing process(raw material selection,firing process,silver impregnation),and(2)source water ***,an in-depth discussion is presented with emphasis on key research efforts to address two major challenges of conventional CWFs,including(1)simultaneous increase of filter flow rate and bacterial removal efficiency,and(2)removal of various concerning pollutants,such as viruses and metal(loid)*** promote the application of CWFs,future research directions can focus on:(1)investigation of pore size distribution and pore structure to achieve higher flow rates and effective pathogen removal by elucidating pathogen transport in porous ceramic and adjusting manufacture parameters;and(2)exploration of new surface modification approaches with enhanced interaction between a variety of contaminants and ceramic surfaces.

关键词： Point-of-use water treatment Ceramic water filter Bacterial removal Surface modification Water quality

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

One-dimensional titania nanotubes annealed at various temperatures for the photocatalytic degradation of low concentration gaseous pollutants

引用

Particuology 2015年第2期13卷 86-92页

作者： Ho-Hwan Chun Wan-Kuen Jo department of Naval Architecture and Ocean Engineering Pusan National University department of environmental Engineering Kyungpook National University

In this study, one-dimensional titania nanotubes （TNTs） were synthesized using a combined process of chemical and hydrothermal treatments, and their activities for the photocatalytic reactions of selected gaseous pollutants at sub-ppm levels were determined. Additionally, the properties of the TNTs were examined using selected spectroscopic methods. The annealed TNTs showed higher photocatalytic activities for the four target compounds than did the unannealed TNTs. For all the target compounds except benzene, the effect of the annealing temperature on the degradation efficiency was difficult to determine because all degradation efficiencies were very high. However, for benzene, which decomposed with a low efficiency, the degradation activities of the TNTs increased as the treatment temperature was increased from 250 to 300 ℃, while they decreased slightly when the temperature was increased from 300 to 400 ℃. These findings confirm the presence of an optimal annealing temperature for the synthesis of TNTs. Moreover, the average degradation extents for benzene, toluene, ethylbenzene, and o-xylene decreased from 92%, 96%, 99%, and 98% to 77%, 86%, 92%, and 94%, respectively, as the airstream flow rate increased within the range of 1-4L/min. The average degradation extents decreased from 12%, 75%, 87%, and 88% to 3%, 29%, 46%, and 51%, respectively, as the input concentration increased from 0.4 to 1.9 ppm. Overall, these findings suggest that one-dimensional TNTs can be effectively utilized for the degradation of gaseous pollutants under optimal operational conditions.

关键词： vGaseous pollutant Annealing temperature Degradation efficiency Airstream flow rate

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Degradation of Nitrobenzene Wastewater via Iron/Carbon Micro-electrolysis Enhanced by Ultrasound Coupled with Hydrogen Peroxide

引用

China Petroleum Processing & Petrochemical Technology 2017年第4期19卷 72-81页

作者： Qin Yuejiao Yu Lisheng Luo Shuai Jiao Weizhou Liu Youzhi Shanxi Province Key Laboratory of Higee-Oriented chemical Engineering North University of China department of Civil and environmental Engineering Virginia Polytechnic Institute and State University

The zero valent iron/granular active carbon(ZVI/GAC) micro-electrolysis enhanced by ultrasound(US) coupled with hydrogen peroxide(H_2O_2) was investigated for the deep degradation of nitrobenzene-containing wastewater. The results of scanning electron microscopy-energy dispersive X-rays analysis(SEM-EDS) demonstrated that continuously accelerated regeneration of ZVI and GAC in situ by US could improve the process for converting nitrobenzene(NB) to aniline(AN). H_2O_2 was decomposed catalytically by the byproduct Fe^(2+) ions generated in the micro-electrolysis process to hydroxyl radicals and the organic pollutants in the wastewater were finally mineralized to CO2 and H2O. Effects of the ZVI dosage, the ZVI/GAC mass ratio, the initial pH value and the H_2O_2 dosage on the efficiency for degradation of NB were studied in these experiments. The optimal operating conditions covered a ZVI dosage of 15 g/L, a ZVI/GAC mass ratio of 1:2,an initial pH value of 3 and a H_2O_2 dosage of 4 mL. In this case, the NB removal efficiency reached 97.72% and the total organic carbon(TOC) removal efficiency reached 73.42% at a NB concentration of 300 mg/L. The reduction of NB by USZVI/GAC followed the pseudo-first-order kinetics model, and the pseudo-first-order rate constants were given at different initial pH values. The reaction intermediates such as AN, benzoquinonimine, p-benzoquinone, p-nitrophenol and other organic acids were detected and a probable pathway for NB degradation has been proposed.

关键词： iron/carbon micro-electrolysis ultrasound hydrogen peroxide nitrobenzene wastewater treatment degradation mechanisms

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Low-cost adsorbents for urban stormwater pollution control

引用

Frontiers of environmental Science & Engineering 2020年第5期14卷 75-82页

作者： Yang Deng department of Earth and environmental Studies Montclair State UniversityMontclairNJ 07043USA

Stormwater represents a major non-point pollution source at an urban *** improve the treatment efficacy ofstormwater infrastructure,low-cost adsorbents have increasingly gained attention over the past *** article aims to briefly discuss several key aspects and principles for utilization of low-cost adsorbents for urban stormwater *** determine whether a low-cost adsorbent is suitable for stormwater treatment,two aspects should be carefully assessed,including:1)its adsorption mechanisms and behaviors that can influence the binding strength,adsorption kinetics,and treatment capacity;and 2)unwanted chemical leaching patterns that can affect the extent of water quality ***,the application mode of an adsorbent in the system design influences the utilization ***,after dosed to soil media in infrastructure,would eventually become ineffective after *** contrast,standalone filters or innovative composite adsorbents(e.g.,adsorbent-coated mulch chips)can enable a long-lasting adsorption due to periodic replacement with fresh *** aforementioned principles play a key role in the success of urban stormwater treatment with low-cost adsorbents.

关键词： Urban stonnwater Runoff pollutants Low-cost adsorbents Adsorption chemical leaching

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Self-regeneration of activated carbon modified with palladium catalyst for electrochemical dechlorination

引用

Chinese chemical Letters 2007年第8期18卷 1013-1016页

作者： Yan Qing Cong Zu Cheng Wu department of environmental Engineering Zhejiang University Hangzhou 310027 China

Catalyst regeneration and the retention of high catalytic activity are still the critical issues in environmental application. A novel fluidized gas-liquid-solid electrochemical reactor was developed to simultaneously remove chlorinated pollutants and in situ regenerate the spent catalyst. Activated carbon modified with palladium catalyst （AC-Pd） was prepared for electrochemical dechlorination. For the 4-chlorophenol wastewater of initial concentration 200 mg· L^- 1, the removal efficiency could nearly reach 100% in less than 30 rain. Catalytic activity of AC-Pd catalyst was preserved effectively even in consecutive cycling run without special regeneration. OH radicals, generated by electrochemical reaction, played a critical role in self-regeneration of AC-Pd. High catalytic activity of spent AC-Pd catalyst provided an attractive alternative in wastewater treatment.

关键词： Activated carbon Palladium Electrochemical dechlorination Hydroxyl radical Regeneration

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Application of the AERMOD modeling system for environmental impact assessment of NO_2 emissions from a cement complex

引用

Journal of environmental Sciences 2011年第6期23卷 931-940页

作者： Kanyanee Seangkiatiyuth Vanisa Surapipith Kraichat Tantrakarnapa Anchaleeporn W.Lothongkum department of chemical Engineering Faculty of EngineeringKing Mongkut's Institute of Technology LadkrabangBangkok 10520Thailand Air Quality and Noise Management Bureau Pollution Control DepartmentMinistry of Natural Resources and EnvironmentBangkok 10400Thailand department of environmental Health Sciences Faculty of Public HealthMahidol UniversityBangkok 10400Thailand

We applied the model of American Meteorological Society-environmental Protection Agency Regulatory Model（AERMOD） as a tool for the analysis of nitrogen dioxide（NO2） emissions from a cement complex as a part of the environmental impact *** dispersion of NO2 from four cement plants within the selected cement complex were investigated both by measurement and AERMOD simulation in dry and wet *** values of NO2 emissions were compared with those obtained during a 7-day continuous measurement campaign at 12 *** was predicted that NO2 concentration peaks were found more within 1 to 5 km,where the measurement and simulation were in good agreement,than at the receptors 5 km further away from the reference *** QuantileQuantile plots of NO2 concentrations in dry season were mostly fitted to the middle line compared to those in wet *** can be attributed to high NO2 wet *** results show that for both the measurement and the simulation using the AERMOD,NO2 concentrations do not exceed the NO2 concentration limit set by the National Ambient Air Quality Standards（NAAQS） of *** indicates that NO2 emissions from the cement complex have no significant impact on nearby *** can be concluded that the AERMOD can provide useful information to identify high pollution impact areas for the EIA guidelines.

关键词： AERMOD environmental impact assessment Gaussian model air pollutants NO2 cement plant

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Oligomeric donor with appropriate crystallinity for organic solar cells

引用

Chinese chemical Letters 2024年第2期35卷 289-294页

作者： Kaiming Yang Min Lv Yanhong Chang Kun Lu Zhixiang Wei CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China department of environmental Science and Engineering University of Science and Technology BeijingBeijing 100083China Beijing Key Laboratory of Resource Treatment of Typical Industrial pollutants Beijing 100083China

Improving the performance of all-small-molecule organic solar cells(ASM-OSCs)largely depends on the design and application of novel donors with appropriate *** molecular conjugation is an effective method for regulating molecular stacking and *** this work,we successfully designed and synthesized two novel acceptor-donor-donor-donor-acceptor(A-D-D-D-A)type oligomeric donors with three dithieno[2,3-d:2′,3′-d′]benzo[1,2-b:4,5-b']dithiophene(DTBDT)as the central unit,named as 3DTBDT-Cl and 3DTBDT,depending on with and without chlorine substitution on the thiophene side *** found that the introduction of chlorine atoms makes the blend films display stronger crystallinity but with large-scale phase separation morphology and more defects,which eventually leads to a power conversion efficiency(PCE)of only 10.83%,whereas the blend films based 3DTBDT with appropriate crystallinity achieved 13.74%*** with 3DTBDT-Cl/L8-BO,the 3DTBDT/L8-BO films exhibited a nanoscale bi-continuous interpenetrating network morphology with a smaller domain size and more suitable crystallinity,which guarantees the corresponding devices obtained more efficient exciton dissociation,efficient charge transport,reduced bimolecular recombination,and performed more balanced carrier *** results demonstrated that regulating the crystallinity of oligomeric donors to obtain the desired phase separation morphology in the blend films could facilitate further improving the performance of ASM-OSCs.

关键词： Linked donor unit Oligomeric donors Crystallinity regulation Organic solar cells

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Photochemical properties and source of pollutants during continuous pollution episodes in Beijing, October, 2011

引用

Journal of environmental Sciences 2014年第1期26卷 44-53页

作者： Jian Gao Yuechong Zhang Meng Zhang Jingqiao Zhang Shulan Wang Jun Tao Han Wang Datong Luo Fahe Chai Chun Ren State Key Laboratory of environmental Criteria Risk Assessment Chinese Research Academy of environmental Sciences South China Institute of environmental Sciences Ministry of Environmental Protection

Beijing suffered from serious air pollution in October, 2011 with the occurrence of three continuous episodes. Here we analyze the pollution status of particulate matter, the relationship between the gaseous pollutants, physical and chemical properties of single particles, and the profile of water-soluble ions in PM2.5 during the three episodes. Regional and photochemically aged air masses, which were characterized as having high values of O3 and SO2, were hypothesized to have played a dominant role in the first episode. After mixing local air masses with freshly-emitted primary pollutants, the concentration of NOx continued to increase and the size of SO42-, NO3- and NH4＋ in the particle population continued to become smaller. The amount of elemental carbon-rich and organic carbonrich particles in the scaled single particles （0.2-2 μm） and water-soluble K＋ in PM2.s also increased in the episodes. All the available information suggests that the biomass or fuel burning sources in or around Beijing may have had a huge impact on the last two episodes.

关键词： Beijing particulate matter single particles photochemical property pollution episodes

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Recent advances in thin film composites membranes for brackish groundwater treatment with critical focus on Saskatchewan water sources

引用

Journal of environmental Sciences 2019年第7期31卷 181-194页

作者： Arash Mollahosseini Amira Abdelrasoul department of chemical and Biological Engineering University of Saskatchewan Global Institute of Water Security

Drinking water scarcity is an ever-increasing global concern. This issue appears as a greater threat to the countries with no access to sea water resources or rivers, since their potential water resources are only limited to ground waters only. There are serious concerns with the treatment of ground water resources, including landfill leachates, agricultural contaminations(pesticides,herbicides, and fertilizers), and rural contaminations. Membrane separation has been proved to be the governing technology in water and wastewater treatment plants, as these methods are responsible for more than half of the market share of the world's desalination capacity. This study intends to offer a holistic view of the groundwater contamination with specific focus on Saskatchewan province in Canada, and the recent efforts in the groundwater treatment using thin film composite membrane technology. This study begins with an introduction of the general aspects of ground water and membrane separation, polluting agents, and their *** is followed by a discussion of Saskatchewan's groundwater status and various ***, the recent research that became available since 2010 is reviewed in details and the results are summarized with respect to purification efficiency. Different affecting parameters in a groundwater-thin film composite system are synthesized and an in-depth overview is presented.

关键词： Thin film composite membrane Groundwater Brackish water Water pollution Polyamide Canada Saskatchewan

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Persulfate activation by single-atom catalysts for the removal of organic pollutants: A review

引用

Resources chemicals and Materials 2023年第1期2卷 63-79页

作者： Yuqi Liu Huanxin Zhao College of environmental and Safety Engineering Shenyang University of Chemical TechnologyShenyang 110142China

Single-atom catalysts(SACs)have received enormous attention in the field of catalysis due to their inherent mer-its,such as nearly 100%atomic efficiency,environmental friendliness,and unique physicochemical *** emerging SACs have facilitated the development and advancement of *** rapidly increasing ap-plications of SACs in various fields,including oxygen evolution reaction,organic synthesis,hydrogen evolution reaction,and CO_(2) reduction,reflect their enormous ***,SACs have been extensively used in per-sulfate(PS)activation for refractory organic pollutants degradation in the aqueous *** exhibit distinct advantages of both homogeneous and heterogeneous catalysis,demonstrating a prospective application in PS *** review first introduces the synthesis and characterization schemes of SACs in PS ***,the factors influencing PS activation by SACs,including coordination numbers,type of coordination atoms,the spin state of metal sites,type of carriers,and the loading amount of metal atoms,are ***,the applications and activation mechanisms of SACs are ***,the opportunities and challenges confronted by SACs and their future development prospects in advanced oxidation processes(AOPs)are put forward.

关键词： Persulfate activation Single-atom catalyst s AOPs Organic pollutants

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

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：