期刊：
Indoor and Built Environment,2023年32(10):2034-2049 ISSN：1420-326X
通讯作者：
Li, CJ;Yu, CW
作者机构：
[Wang, Chenhua] Tianjin Univ, Sch Environm Sci & Engn, Tianjin, Peoples R China.;[Wang, Chenhua; Wang, Hanqing; Yu, Chuck W.; Li, Chengjun] Univ South China, Natl & Local Joint Engn Res Ctr forAirborne Pollut, Sch Civil Engn, Hengyang, Peoples R China.;[Wang, Hanqing; Li, Chengjun] Cent South Univ Forestry & Technol, Sch Civil Engn, Changsha 410211, Peoples R China.;[Wang, Hanqing; Li, Chengjun] Hunan Engn Res Ctr Full Life cycle Energy efficien, Changsha, Hunan, Peoples R China.;[Yu, Chuck W.] Int Soc Built Environm ISBE, Milton Keynes, England.
通讯机构：
[Yu, CW ] I;[Li, CJ ] C;Cent South Univ Forestry & Technol, Sch Civil Engn, Changsha 410211, Peoples R China.;Int Soc Built Environm ISBE, Milton Keynes, England.
关键词：
Air purifier;Airborne transmission;Computational fluid dynamics;COVID virus;Risk mitigation;Ventilation parameters
摘要：
Indoor and Built Environment, Volume 32, Issue 10, Page 2034-2049, December 2023. <br/>This study evaluated the effect of ventilation rate and air supply angle of an air purifier using computational fluid dynamics to determine the dispersion of airborne COVID virus exhaled by an infected person. The risk of infection for an occupant was determined based on the virus concentration in the active area and accumulated particle dose within the breathing zone by varying the ventilation parameters. The air purifier was found to provide a local dilution and would block the development of an expiratory jet for a short time to reduce transmission risk. Compared to the case without an air purifier, the maximum reductions were 94.27% in the accumulated dose and 53.2% in the particle count concentration. In the breathing area, the larger air supply angle (90° > 60° > 30°) is better when the ventilation rate was 27.0 m3/h and 40.5 m3/h. Otherwise, 60° air supply angle is preferable where the ventilation rate was 54.0 m3/h. Assessing the results with the grey relational analysis revealed that the relational degree for particle count concentration was greater by varying the ventilation rate than by varying the air supply angle. However, the relational degree according to the accumulated dose was greater by varying the air supply angle than by increasing the ventilation rate. These findings may provide an important control strategy to effectively mitigate the risk of infection in a confined room by using an air purifier.
期刊：
Journal of Radioanalytical and Nuclear Chemistry,2023年332(11):4427-4439 ISSN：0236-5731
通讯作者：
Xie, D
作者机构：
[Yang, Xiaomin] Univ South China, Sch Resource Environm & Safety Engn, Hengyang 421001, Peoples R China.;[Xie, D; Xie, Dong; Wu, Hui; Yang, Xiaomin] Natl & Local Joint Engn Res Ctr Airborne Pollutant, Hengyang 421001, Peoples R China.;[Xie, D; Xie, Dong; Wu, Hui] Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China.
通讯机构：
[Xie, D ] N;Natl & Local Joint Engn Res Ctr Airborne Pollutant, Hengyang 421001, Peoples R China.;Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China.
摘要：
The effective capture of iodine vapour, a potential threat of environment and human health, is crucial for efficiently managing nuclear waste gases. Herein, the adsorption property of iodine vapour on modified activated carbon fibers was investigated using adsorption experiment and simulation methods, to explain the adsorption mechanism at different scales. Preliminary results hint that the ideal adsorbent should have lower density, higher adsorption coefficient and taller poriness, and more pores between 1.6 and 1.9 nm. Compared with KOH modification, microwave modification can effectively improve the performance of activated carbon fibers for capturing iodine vapour.
作者机构：
[Yu Chen; Gong Zhang; Huijuan Liu] Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China;School of Civil Engineering, University of South China, Hengyang 421001, Hunan Province, China;[Chao Xiang] Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China<&wdkj&>School of Civil Engineering, University of South China, Hengyang 421001, Hunan Province, China
通讯机构：
[Gong Zhang] C;Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
关键词：
arsenic adsorption;filter;flexible adsorbent;graphene hydrogel;mass transfer
作者机构：
[Chen, Zhenfu; Tao, Qiuwang; Jin, Dan; Huang, Xinyun; Wu, Dan] Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China.;[Chen, Zhenfu; Tao, Qiuwang; Jin, Dan; Huang, Xinyun; Wu, Dan] Univ South China, Key Lab High Performance Special Concrete Hunan Pr, Hengyang 421001, Peoples R China.;[Chen, Zhenfu; Tao, Qiuwang; Huang, Xinyun] Univ South China, Key Lab High Performance Concrete China Nucl Ind, Hengyang 421001, Peoples R China.;[Xie, Liping] China Nucl Ind 22ND Construct Co Ltd, Yichang 443101, Peoples R China.
通讯机构：
[Zhenfu Chen] K;Key Laboratory of High-Performance Special Concrete in Hunan Province, University of South China, Hengyang 421001, China<&wdkj&>School of Civil Engineering, University of South China, Hengyang 421001, China<&wdkj&>Key Laboratory of High-Performance Concrete in China Nuclear Industry, University of South China, Hengyang 421001, China<&wdkj&>Author to whom correspondence should be addressed.
关键词：
high temperatures;multiple heating;magnetite shielded concrete;splitting tensile strength;gamma-ray shielding properties
摘要：
Radiation shielding concrete is one of the most used materials in the construction of nuclear power plants and will be subjected to high temperatures for a long time during its service life. This study aims to investigate deterioration of radiation shielding concrete with multiple heating at different temperatures. A microwave oven was used as a heating apparatus to simulate irradiation, and 200, 300, and 400 degrees C were selected as experimental cycle temperatures. The apparent characteristics, mass loss, splitting tensile strength, and gamma ray shielding properties of the commonly used magnetite shielding concrete were investigated. The results showed that the splitting tensile strength and gamma shielding performance of concrete were dramatically reduced at first heating. Then, as the heating times increased, the splitting tensile strength and gamma shielding properties of the concrete continued to deteriorate, and the higher the increase in heating temperature, the more severe the deterioration of the concrete. During the service period of radiation shielded concrete, the magnitude of temperature under the service conditions will affect the deterioration degree of concrete, and the continuous change of temperature will continuously lead to the deterioration of concrete.
摘要：
A new persimmon tannin-modified graphene oxide/chitosan microsphere (PGC) was prepared by the mixed crosslinking method, and the effective adsorption behavior of U(VI) in an aqueous solution was discussed. The study shows that at the temperature of 30 & DEG;C, pH of 5, time of 120 min, and the an initial uranium concentration of 10.00 mg/L, the maximum adsorption capacity of PGC microspheres for U(VI) reached 199.13 mg/g, with a removal rate of 98.2%. The adsorption process of U(VI) by PGC microspheres conforms to the pseudo-second-order kinetic model and the Freundlich isothermal adsorption model. The adsorption mechanism of U(VI) by PGC microspheres is electrostatic interaction and chelation reaction. Meanwhile, PGC microspheres have excellent adsorption selectivity and recycling, and they have a good adsorption effect in the uranium treatment of rare earth real wastewater. Therefore, PGC microspheres can be used as a promising material to treat uranium-containing rare earth wastewater.
摘要：
吸附是生物炭在环境修复和农业等领域应用中的关键过程之一。为探究生物炭吸附领域的发展趋势和研究热点，采用文献计量学的方法，利用可视化文献分析软件CiteSpace和R::bibliometrix对WebofScience中核心数据库收录文献特征进行定量分析。结果表明，近20年来生物炭吸附领域研究热度持续增加，中国发文数量远超其他国家；韩国高丽大学OkYongSik、美国佛罗里达大学高斌、中国湖南大学曾光明等是该领域的重要学者。主要期刊有Science of The Total Environment、Chemosphere、Journal of Hazardous Materials等；研究的热点包括市政污泥和甘蔗秸秆基生物炭、生物炭对重金属及染料的吸附效果等；固体废弃物制备生物炭、离子强度影响和竞争吸附作用等涉及实际应用的问题在近几年也具有较高热度。
