铁锰层状双氢氧化物的制备及其对废水中Sb(III)的吸附行为
作者：
杨金辉;李聪;谢水波;杨斌;魏柏;...
期刊：
复合材料学报 ,2022年39(8):3871-3881 ISSN：1000-3851
通讯作者：
Yang, Bin(932936624@qq.com)
作者机构：
[杨金辉; 李聪; 谢水波; 杨斌; 魏柏; 田追] School of Civil Engineering, University of South China, Hengyang;421001, China;[杨金辉; 李聪; 谢水波; 杨斌; 魏柏; 田追] 421001, China
通讯机构：
[Yang, B.] S;School of Civil Engineering, China
关键词：
铁锰层状双氢氧化物;共沉淀;吸附;含Sb(Ⅲ)废水;机制
摘要：
为更好的处理水环境中的锑（Ⅲ）污染问题，采用超声共沉淀法制备了铁锰层状双氢氧化物（Fe-Mn LDH），并研究初始pH、投加量、共存离子、吸附时间及温度等因素对Fe-Mn LDH去除废水中Sb（Ⅲ）的影响。通过扫描电子显微镜（SEM）、能谱仪（EDS）、X射线衍射（XRD）、X射线光电子能谱（XPS）和傅里叶红外光谱（FTIR）等表征手段对材料晶体结构、形貌、吸附机制等进行了表征及分析。结果表明Fe-Mn LDH去除Sb（Ⅲ）的适宜条件为：pH=5、投加量为0.4 g/L、吸附时间150 min；在此条件下，在温度45℃时最大吸附量为77.39 mg/g。吸附过程符合拟二级动力学模型，Freundich吸附等温线模型能够很好的描述Fe-Mn LDH对Sb（Ⅲ）的吸附行为。Sb（Ⅲ）吸附去除机制主要为离子交换、配位络合和静电吸附。通过4次吸附-解析实验发现，Sb（Ⅲ）去除率在83.03%以上。本研究表明Fe-Mn LDH具备处理与修复含Sb（Ⅲ）废水污染的潜力。
语种：
中文
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磁性γ-Fe_2O_3/玉米秸秆淀粉的制备及其对废水中U(VI)吸附性能
作者：
范甲;胡世琴;魏柏;杨金辉;曾倩;...
期刊：
复合材料学报 ,2022年39(10):4898-4907 ISSN：1000-3851
通讯作者：
Yang, Jinhui(842893915@qq.com)
作者机构：
[范甲; 胡世琴; 魏柏; 杨金辉; Zeng, Qian; 杨芳婷] College of Civil Engineering, University of South China, Hengyang;421001, China;Hunan Province Key Laboratory of Pollution Control and Resource Reuse Technology, University of South China, Hengyang;[范甲; 胡世琴; 魏柏; 杨金辉; Zeng, Qian; 杨芳婷] 421001, China;[胡世琴; 魏柏; 杨金辉] 421001, China<&wdkj&>Hunan Province Key Laboratory of Pollution Control and Resource Reuse Technology, University of South China, Hengyang
通讯机构：
[Yang, J.] C;[Yang, J.] H;Hunan Province Key Laboratory of Pollution Control and Resource Reuse Technology, China;College of Civil Engineering, China
关键词：
玉米秸秆淀粉;铀;吸附性能;离子交换
摘要：
随着核能发展,放射性核素铀通过各种途径流入环境,对人类的身体健康构成潜在威胁。以废弃玉米秸秆为原料自制玉米秸秆淀粉(CSS),采用共沉淀法将磁性γ-Fe_2O_3包裹在CSS表面合成磁性γ-Fe_2O_3/CSS,并用于溶液中U(VI)的吸附。考察初始pH值、投加量、时间、初始浓度、温度和共存离子等因素对γ-Fe_2O_3/CSS吸附U(VI)性能的影响,并加以分析。采用SEM、FTIR、XPS对吸附前后的磁性γ-Fe_2O_3/CSS进行表征分析,深入研究其对吸附U(VI)的技术机制。结果表明:在适宜条件下,γ-Fe_2O_3/CSS对U(VI)的最大吸附量达到214.1 mg/g。准二级动力学模型更准确地描述其吸附过程即以化学吸附为主。磁性γ-Fe_2O_3/CSS对U(VI)吸附符合Langmuir模型和Freundlich模型。吸附机制主要为U(VI)与γ-Fe_2O_3/CSS的羟基、羧基发生络合反应与离子交换作用。通过4次吸附解吸实验表明,U(VI)吸附率仍在78.60%以上,说明磁性γ-Fe_2O_3/CSS具有一定的再生能力。
语种：
中文
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α-Fe_2O_3与活性炭协同处理尿液废水的过程优化与吸附特性
作者：
焦赟仪;周书葵;张良长;艾为党;康赛;...
期刊：
化工进展 ,2021年40(4):2347-2356 ISSN：1000-6613
通讯作者：
Zheng, Libing(lbzheng@rcees.ac.cn)
作者机构：
中国科学院生态环境研究中心环境模拟与污染控制国家重点联合实验室;中国科学院生态环境研究中心水污染控制实验室;[周书葵] 南华大学土木工程学院;[张良长; 艾为党] 中国航天员训练中心人因工程重点实验室;[郑利兵; 魏源送; 李晨璐; 康赛] 中国科学院生态环境研究中心环境模拟与污染控制国家重点联合实验室<&wdkj&>中国科学院生态环境研究中心水污染控制实验室
关键词：
活性炭;尿液;吸附;动力学
摘要：
为探究α-Fe2O3与活性炭协同吸附对尿液的处理效果,本文考察了铁炭比、投加量及尿液酸预处理的影响,并重点分析了协同吸附特性。研究发现,铁炭比为0.6时,尿液中总有机碳（TOC）、PO43--P、总磷（TP）的去除率分别为39.51%、71.03%和76.79%,TOC的去除主要依靠活性炭的吸附作用,而PO43--P主要依靠α-Fe2O3的作用,尿液酸预处理可显著强化PO43--P的吸附。TOC和PO43--P的吸附过程均符合Redlich-Peterson吸附等温线模型,为单层吸附和多层吸附共同作用。动力学研究发现,TOC和PO43--P的吸附均可在24h内达到吸附平衡,PO43--P的动力学吸附过程更符合Elovich模型,即不均匀界面上的多层吸附,而TOC的动力学过程主要受扩散速率控制。同时,协同吸附对发光溶解性有机物（CDOM）的去除率可达72.16%,对腐殖酸类的吸附效果最佳,酸预处理主要减少酪氨酸类、色氨酸类和可溶性微生物代谢产物的吸附。P的去除主要依靠其与α-Fe2O3和尿液中无机盐的共沉淀作用,并以无机盐沉积的形式附着于活性炭孔道内。
语种：
中文
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Rheokinetics and fluidity modification of alkali activated ultrafine metakaolin based geopolymers
作者：
Ouyang, Gaoshang;Wang, Jingsong* ;Wang, Rui;Chen, Leping;Bu, Bo
期刊：
Construction and Building Materials ,2021年269:121268 ISSN：0950-0618
通讯作者：
Wang, Jingsong
作者机构：
[Ouyang, Gaoshang; Bu, Bo; Wang, Jingsong; Chen, Leping; Wang, Rui] Univ South China, Sch Civil Engn, Hengyang 421001, Hunan, Peoples R China.;[Ouyang, Gaoshang; Wang, Jingsong] Univ South China, Yangtze Delta Res Inst, Zhuji 311800, Peoples R China.
通讯机构：
[Wang, Jingsong] U;Univ South China, Sch Civil Engn, Hengyang 421001, Hunan, Peoples R China.
关键词：
Rheokinetics;Geopolymerization;Fluidity modification;Viscosity
摘要：
The rheokinetics of geopolymer slurry and its fluidity modification methods, as well as modification mechanism were investigated by performing viscosity time dependence experiments and a cement comparative experiment. The results show that the viscosity curve of geopolymer slurry fits well with power law equations. The viscosity time dependence can be employed to characterize the geopolymerization process, and to describe the variations of fluidity with time. K+ activated geopolymer has lower initial viscosity and better fluidity retention than Na+ does. Among superplasticizers, naphthalene-based superplasticizer performs best, but superplasticizers simultaneously promote the deformation of viscosity. Viscosity curve of cement changed unevenly. (C) 2020 Elsevier Ltd. All rights reserved.
语种：
英文
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Effect of silane coupling agent on the rheological and mechanical properties of alkali-activated ultrafine metakaolin based geopolymers
作者：
Ouyang, Gaoshang;Wu, Lianjie;Ye, Chuxiong;Wang, Jingsong;Dong, Teng
期刊：
Construction and Building Materials ,2021年290:123223 ISSN：0950-0618
通讯作者：
Wang, Jingsong(1994000105@usc.edu.cn)
作者机构：
[Ouyang, Gaoshang; Ye, Chuxiong; Wang, Jingsong; Dong, Teng; Wu, Lianjie] Univ South China, Sch Civil Engn, Hengyang 421001, Hunan, Peoples R China.;[Ouyang, Gaoshang; Wang, Jingsong; Wu, Lianjie] Univ South China, Yangtze Delta Res Inst, Zhuji 311800, Zhejiang, Peoples R China.
通讯机构：
[Jingsong Wang] S;School of Civil Engineering, University of South China, Hengyang 421001, Hunan Province, China<&wdkj&>Yangtze Delta Research Institute, University of South China, Zhuji 311800, Zhejiang Province, China
关键词：
Silane coupling agent;Rheology;Rheokinetics;Mechanical properties
摘要：
Y Fluidity modification on geopolymer without changing its compositions is necessary. This study, firstly, investigated the optimal oxides molar ratios of geopolymers, then rheology, rheokinetics, fluidity and mechanical properties tests were conducted to study the influence of silane coupling agent (SCA) on geopolymers. Finally, characterization techniques of SEM, pore size distribution, FTIR and DSC were used to reveal the mechanisms. The results show when SiO2/Al2O3 = 3.4, M2O/Al2O3 = 1, and H2O/M2O = 11, geopolymer's fluidity reaches 144 mm with the best compressive strength. The addition of 2 wt% SCA can reduce viscosity, increasing the fluidity to 167 mm, while excessive SCA can't. SCA can also increase the viscosity growth rate and influence the microstructure of geopolymers. (C) 2021 Elsevier Ltd. All rights reserved.
语种：
英文
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蒙脱土/Fe_3O_4/腐殖酸复合材料对U(Ⅵ)的作用机制
作者：
司子彦;谢水波;朱奥琦;王国华;刘迎九;...
期刊：
材料工程 ,2021年49(3):158-166 ISSN：1001-4381
通讯作者：
Xie, Shui-Bo(xiesbmr@263.net)
作者机构：
[司子彦; 谢水波; 朱奥琦; 王国华; 刘迎九; 莫官海] School of Civil Engineering, University of South China, Hengyang;421000, China;Hunan Provincial Key Laboratory of Pollution Control and Resources Technology, University of South China, Hengyang;[司子彦; 谢水波; 朱奥琦; 王国华; 刘迎九; 莫官海] 421000, China;[谢水波; 刘迎九] 421000, China<&wdkj&>Hunan Provincial Key Laboratory of Pollution Control and Resources Technology, University of South China, Hengyang
通讯机构：
[Xie, S.-B.] S;School of Civil Engineering, China
关键词：
蒙脱土/Fe_3O_4/腐殖酸复合材料;吸附剂;吸附;还原;络合
摘要：
通过水热法制备蒙脱土/Fe3O4/腐殖酸复合材料（MFH）,探究pH值、MFH的投加量、吸附时间、U（Ⅵ）初始浓度及温度等因素对MFH吸附U（Ⅵ）的影响。结果表明:在所选实验条件范围内,MFH的投加量对其吸附U（Ⅵ）的影响最大;当U（Ⅵ）初始浓度为5 mg·L-1,pH值为6,MFH投加量为0.3 g·L-1,温度为30℃时,MFH对U（Ⅵ）去除在30 min后达到平衡,此时去除率达到97.7%;MFH对U（Ⅵ）的吸附符合准二级动力学模型和Langmuir模型;MFH对U（Ⅵ）的去除机理为络合作用和还原作用。再生实验表明,经5次吸附-解吸后,MFH复合材料对U（Ⅵ）的吸附率仍在90%以上,表明MFH对U（Ⅵ）的去除效果较好且具有高效重复利用性。
语种：
中文
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Nonlinear study on the structure-soil-structure interaction of seismic response among high-rise buildings
作者：
Long, Hui;Wang, Zicheng;Zhang, Chunshun;Zhuang, Haiyang;Chen, Wenzhao;...
期刊：
Engineering Structures ,2021年242:112550 ISSN：0141-0296
通讯作者：
Zhang, Chunshun(Ivan.Zhang@monash.edu)
作者机构：
[Long, Hui; Peng, Cheng; Chen, Wenzhao] Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China.;[Wang, Zicheng] Cent South Univ, Sch Civil Engn, Changsha 410075, Peoples R China.;[Zhang, Chunshun] Monash Univ, Dept Civil Engn, Clayton, Vic 3800, Australia.;[Zhuang, Haiyang] Nanjing Tech Univ, Inst Geotech Engn, Nanjing 210009, Peoples R China.
通讯机构：
[Chunshun Zhang] D;Department of Civil Engineering, Monash University, VIC 3800, Australia
关键词：
Dynamic structure-soil-structure interaction;High-rise building;Nonlinear;Seismic response;Static-dynamic coupled numerical simulation
摘要：
Based on the 1–3 identical high-rise buildings with pile-raft foundation, a series of building-site two-dimensional finite element analysis models with different building spacings is established. Then, considering the nonlinear characteristics of soil and structure, the static-dynamic coupled numerical simulations are conducted to study the structure-soil-structure interaction (SSSI) under different ground motion. The results show that: 1) Adjacent high-rise buildings have the most unfavorable impact on the peak acceleration of the 1/4–1/2 height floors of the middle building, and increase the normalized response acceleration spectra value of acceleration near the second natural period of the structure; 2) Adjacent high-rise buildings have the most significant impact on the inter-story drift of the top, bottom and basement of the middle building; 3) Adjacent high-rise buildings redistribute the total horizontal shear force of the pile top of the middle building among the pile foundations, so that the peak value of the pile top shear force of each pile changes significantly, which is extremely unfavorable to the seismic safety of the structure. It should be taken seriously in the seismic design of structures. In addition, the structure spacing that results in favorable or unfavorable effects is discussed, and the reasons for the impact are analyzed. © 2021 Elsevier Ltd
语种：
英文
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The effect of Na+ and H2O on structural and mechanical properties of coal gangue-based geopolymer: Molecular dynamics simulation and experimental study
作者：
Wang, Rui;Wang, Jingsong* ;Song, Qingchun
期刊：
Construction and Building Materials ,2021年268:121081 ISSN：0950-0618
通讯作者：
Wang, Jingsong
作者机构：
[Wang, Rui] Univ South China, Sch Resource Environm & Safety Engn, Hengyang 421001, Hunan, Peoples R China.;[Wang, Jingsong; Song, Qingchun] Univ South China, Sch Civil Engn, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Wang, Jingsong] U;Univ South China, Sch Civil Engn, Hengyang 421001, Hunan, Peoples R China.
关键词：
Na+;H2O;Coal gangue-based geopolymer;Molecular structure;Mechanical properties;Molecular dynamics simulation
摘要：
The aim of this work is to study the impacts of Na+ and H2O on structural and mechanical properties of coal gangue-based geopolymer by experiment and molecular dynamics. Geopolymers were prepared by coal gangue and mixed solution of NaOH and water glass. Then X-ray fluorescence (XRF) and X-ray diffraction (XRD) were utilized to characterize the main chemical composition and crystalline phase of geopolymer after 28d curing. Moreover, Na2Si2O5 glass was firstly proposed to establish the molecular structure of geopolymers with different Na/Al and H2O/Al. Structural optimization and molecular dynamics simulation were implemented under the specific force field. Simulated XRD pattern, energy and temperature curves, radial distribution function (RDF), hydrogen bond, bond angle distribution, mean square displacement (MSD) and elastic modulus of geopolymer were calculated and analyzed. Results indicated that with the increase of Na+ and H2O content, structure of geopolymer became more stable and mechanical properties were improved significantly. (C) 2020 Elsevier Ltd. All rights reserved.
语种：
英文
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Experiment on the Effect of Freezing–Thawing Cyclic on Mechanical Properties of Solidified Sludge
作者：
Peng, Cheng;Tian, Zongkun;Long, Hui;Tan, Yuqing
期刊：
Geotechnical and Geological Engineering ,2021年39(6):4195-4204 ISSN：0960-3182
通讯作者：
Tian, Zongkun(tzk_96@163.com)
作者机构：
[Peng, Cheng; Tian, Zongkun; Long, Hui; Tan, Yuqing] School of Civil Engineering, University of South China, Hengyang;421001, China;[Peng, Cheng; Tian, Zongkun; Long, Hui; Tan, Yuqing] 421001, China
通讯机构：
[Zongkun Tian] S;School of Civil Engineering, University of South China, Hengyang, China
关键词：
Failure strength;Freeze–thaw cycling;Moisture migration;Shear strength parameter;Solidified sludge
摘要：
The solidification technology of sludge can effectively solve the problem of environmental pollution and resource shortage. Whereas, the current study lacks the exploration of the durability of solidified sludge. The freeze–thaw cycle test and the moisture transfer test were carried out to test the freeze–thaw resistance and the failure mechanism of the solidified sludge. The results showed that the content of fly ash has a significant effect on the freeze–thaw cycle of the mechanical properties of the solidified sludge. The stress–strain relationship of different dosage samples tends to approach the number of freeze–thaw cycles increases. The stress–strain curve of the samples under all confining pressures is strain-hardening type, which failure mode is ductile failure. The incorporation of fly ash can improve the failure strength and cohesion of cement–lime solidified soil, and gradually increase with the increase of fly ash content. The freeze–thaw cycle test is carried out under the closed system. The moisture in the sample migrates under the temperature load, causing the water content to increase and decrease the partition distribution. The sample with lower fly ash content has smaller static pressure density, which is beneficial to water migration. And increasing the range of water increase zone, the effect of the sample on the freeze–thaw cycle is relatively small. However, the influence of the number of freeze–thaw cycles on the internal friction angle of each soil sample depends largely on the distribution of water in the soil sample, it does not appear regular changes. During the freezing and thawing process, the effects of fly ash content and water redistribution on the mechanical properties of the solidified sludge are simultaneous. In short, the samples with different ratios and freeze–thaw cycles have different factors influencing the change of strength. © 2021, The Author(s), under exclusive licence to Springer Nature Switzerland AG part of Springer Nature.
语种：
英文
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石化废水处理厂中耐药菌和耐药基因的分布特征与去除效能解析
作者：
唐振平;肖莎莎;段毅;刘迎九;高媛媛;...
期刊：
环境科学 ,2021年42(7):3375-3384 ISSN：0250-3301
通讯作者：
Zhou, Shuai(zs402606665@126.com)
作者机构：
[唐振平; 段毅; 刘迎九; 周帅] Hunan Province Key Laboratory of Pollution Control and Resources Reuse Technology, University of South China, Hengyang;421001, China;Hunan Key Laboratory of Rare Metal Minerals Exploitation and Geological Disposal of Wastes, Hengyang;[肖莎莎; 高媛媛] School of Civil Engineering, University of South China, Hengyang;[吴月月; 陈怡雯] Institute of Pathogenic Biology, Hengyang Medical College, University of South China, Hengyang
关键词：
石化废水;耐药菌(ARB);耐药基因(ARGs);分布;去除;影响因子
摘要：
抗生素耐药性污染已成为全球新兴环境问题之一.本研究选取某座石化废水处理厂,对耐药菌(ARB)和3种形态耐药基因(ARGs):细胞内耐药基因(iARGs) 、细胞外附着态耐药基因(aeARGs)和游离态耐药基因(feARGs)的分布特征与去除效能开展研究.结果表明,废水处理厂中检出四环素、磺胺和氨苄西林这3类ARB,其绝对浓度为8.45×10~2 ~ 2.38×10~5CFU·mL~(-1).厌氧处理可使这3类ARB绝对浓度下降0.04 lg ~ 0.21 lg;曝气和沉淀处理对ARB的影响因其类型而异;出水ARB绝对浓度高出进水水平0.12 lg ~ 0.63 lg.活性污泥中aeARGs和iARGs绝对丰度分别为1.96×10~7 ~ 3.02×10~(10) copies·g~(-1)和5.22×10~7 ~ 4.15×10~(10) copies·g~(-1);而废水中feARGs绝对丰度为5.90×10~8 ~ 1.01×10~(12) copies·L~(-1).厌氧处理可去除0.13 lg ~ 0.65 lg aeARGs和0.04 lg ~ 0.28 lg iARGs;曝气和沉淀处理对aeARGs和iARGs的去除效果受ARGs类型和形态影响;出水中feARGs绝对丰度较进水升高0.06 lg ~ 0.81 lg.冗余分析表明,ARB浓度与COD、Cl~-和总氮浓度显著正相关(P < 0.05); aeARGs丰度与COD和总氮浓度显著正相关(P < 0.05); iARGs和feARGs丰度均与重金属浓度显著正相关(P < 0.05).本研究证实了石化废水处理厂具有ARB和不同形态ARGs的富集风险,并为特种工业废水耐药性污染研究与防治提供理论基础.
语种：
中文
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g-C_3N_4基异质耦合光催化剂制备及在环境污染物去除领域的研究进展
作者：
葛玉杰;吴姣;何志强;王国华;刘金香
期刊：
材料工程 ,2021年49(4):23-33 ISSN：1001-4381
通讯作者：
Liu, Jin-Xiang(cafardworm@163.com)
作者机构：
[葛玉杰; 吴姣; 何志强; 王国华; 刘金香] School of Civil Engineering, University of South China, Hengyang;421001, China;Hunan Provincial Key Laboratory of Pollution Control and Resources Technology, University of South China, Hengyang;[葛玉杰; 吴姣; 何志强; 王国华; 刘金香] 421001, China;[王国华; 刘金香] 421001, China<&wdkj&>Hunan Provincial Key Laboratory of Pollution Control and Resources Technology, University of South China, Hengyang
通讯机构：
[Liu, J.-X.] S;School of Civil Engineering, China
关键词：
石墨相氮化碳;异质耦合;光催化;环境污染物
摘要：
石墨相氮化碳（g-C3N4）作为一种可见光响应型半导体材料,具有稳定性高、廉价、结构与性能可调控性高等优点。随着绿色环保、无二次污染的光催化技术的不断发展,g-C3N4光催化剂逐渐成为环境与能源科学领域的研究热点。而单一的g-C3N4存在光激发电子-空穴复合过快、可见光的利用率低等缺陷导致其光催化效率较低。在众多的改性方法中,异质耦合被认为是提高g-C3N4光催化性能的有效方法。近年来,研究者通过将不同的无机半导体、贵金属、碳材料等与g-C3N4进行异质耦合,提高了光电子在光催化体系中的转移效率,拓宽了g-C3N4基光催化剂对可见光的吸收范围,并且增强了g-C3N4催化剂稳定性与结构的可调控。本文总结了异质耦合光催化剂的催化机理,综述了以g-C3N4为基础的异质耦合光催化体系的构建,探讨了g-C3N4基异质结在处理环境污染物中的研究进展。最后,对如何设计性能优异的g-C3N4基光催化剂及在光催化降解染料、有机污染物以及有毒重金属等研究方向的发展提出展望。
语种：
中文
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Mechanical properties and constitutive relation of hydrotalcite-carbon nanotube concrete
作者：
Ke, Guojun;Xu, Xin;Fang, Yaochu;Song, Baixing;Jin, Dan;...
期刊：
FULLERENES NANOTUBES AND CARBON NANOSTRUCTURES ,2021年29(12):1016-1025 ISSN：1536-383X
通讯作者：
Zuo, Junqing
作者机构：
[Fang, Yaochu; Song, Baixing; Ke, Guojun; Xu, Xin; Jin, Dan] Univ South China, Sch Civil Engn, Hengyang, Peoples R China.;[Zuo, Junqing] Shanghai Construct Grp Co Ltd, Shanghai 200080, Peoples R China.
通讯机构：
[Junqing Zuo] S;Shanghai Construction Group Co., Ltd, Shanghai, China.
关键词：
Layered double hydroxides;carbon nanotubes;concrete;mechanical properties;constitutive equation
摘要：
Co-Fe-Mg-Al quaternary hydrotalcite-carbon nanotube composites (LDH-CNT composites) were prepared by co-precipitation method and blended into concrete. Universal testing machine and SHPB testing device were used to carry out static and dynamic tests on LDH-CNT concrete specimens with different LDH-CNT additions (0, 0.25 wt.%, 0.5 wt.%), and the dynamic constitutive equation was obtained according to the dynamic stress-strain curve. Results show that compared with ordinary concrete, the compressive strength and toughness of LDH-CNT concrete have been greatly improved. When the LDH-CNT composites content is 0.5 wt.%, the strength and toughness are increased by 10.8% and 16.3%, respectively; The dynamic compression mechanical properties of LDH-CNT concrete show a significant strain rate effect, and the impact compression mechanical parameters increase with the increase of the maximum strain rate. In the strain rate range of 10°∼102s−1, the theoretical curve and the measured curve fit better, and the constitutive equation can describe the dynamic mechanical response of LDH-CNT concrete. © 2021 Taylor & Francis Group, LLC.
语种：
英文
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聚乙烯亚胺改性磁性酵母复合材料去除铀(VI)的性能
作者：
伍随意;李仕友;胡俊毅;贺俊钦;王国华;...
期刊：
复合材料学报 ,2021年38(9):3065-3075 ISSN：1000-3851
通讯作者：
Li, Shiyou(lsy730723@163.com)
作者机构：
[伍随意; 胡俊毅; 贺俊钦; 王国华; 荣丽杉; 金远远] Hunan Provincial Key Laboratory of Pollution Control and Resources Technology, University of South China, Hengyang;421001, China;[李仕友] Key Discipline Laboratory for National Defence for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang;[伍随意; 李仕友; 胡俊毅; 贺俊钦; 王国华; 荣丽杉; 金远远] 421001, China
通讯机构：
[Li, S.] K;Key Discipline Laboratory for National Defence for Biotechnology in Uranium Mining and Hydrometallurgy, China
关键词：
聚乙烯亚胺(PEI);改性;复合材料;吸附;铀;水处理;生物材料
摘要：
为了高效便捷地处理放射性废水,制备了聚乙烯亚胺（PEI）改性磁性酵母（MY）复合生物材料（MY@SiO2-PEI）,并将其用于铀（Ⅵ）的去除。采用SEM、FTIR、Zeta电位及XPS对材料进行表征,运用Visual MINTEQ模拟不同条件下U（Ⅵ）形态分布,通过研究不同溶液pH、温度、反应时间、离子强度,阴离子(CO32-、PO43-)及不同U（Ⅵ）初始质量浓度等方面,考察不同因素对MY@SiO2-PEI吸附U（Ⅵ）的性能影响,并对MY@SiO2-PEI的循环利用能力进行研究。结果表明,MY@SiO2-PEI对U（Ⅵ）的吸附表现出强pH依赖性,离子强度对吸附效果无显著干扰,说明反应主要受表面络合作用控制。FTIR、XPS及Zeta电位分析发现促使U（Ⅵ）吸附的主要因素是材料表面不同官能团（N=C、NH（NH2）、C-N=C）与U（Ⅵ）的络合作用及静电吸引作用。MY@SiO2-PEI最大吸附量可达173.99 mg/g,且吸附在20 min就可达到吸附平衡。准二级动力学和Langmuir等温方程能很好的拟合此吸附过程,且热力学表明吸附过程是自发吸热过程。MY@SiO2-PEI材料的合成方法简便,去除效果好,再生性佳,是一种很有前途的环境污染治理中放射性核素的吸附剂。
语种：
中文
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Energy and exergy performance comparison of conventional, dew point and new external-cooling indirect evaporative coolers
作者：
Yang, Yang;Ren, Chengqin* ;Yang, Congcong;Tu, Min;Luo, Baojun;...
期刊：
Energy Conversion and Management ,2021年230:113824 ISSN：0196-8904
通讯作者：
Ren, Chengqin
作者机构：
[Fu, Jianqin; Ren, Chengqin; Yang, Congcong; Luo, Baojun; Yang, Yang] Hunan Univ, Coll Mech & Vehicle Engn, State Key Lab Adv Design & Mfg Vehicle Body, Changsha 410082, Peoples R China.;[Tu, Min] Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China.
通讯机构：
[Ren, Chengqin] H;Hunan Univ, Coll Mech & Vehicle Engn, State Key Lab Adv Design & Mfg Vehicle Body, Changsha 410082, Peoples R China.
关键词：
Energy analysis;Energy recovery;Evaporative cooling;Exergy analysis;Seasonal energy saving potential evaluation
摘要：
External-cooling indirect evaporative cooling is an effective energy saving technology, where air–water finned coils are linked with packed cooling tower by water pipes. However, external-cooling indirect evaporative coolers with different configurations and working air sources are incomprehensively analyzed and compared. This study presented an energy and exergy analysis of five external-cooling indirect evaporative coolers, including conventional configuration, dew point configuration, newly patented dew point configuration, and energy recovery forms of the first two. In order to analyze the evaporative cooler and its hybrid system combined with mechanical vapor compression system, the numerical model and experimental correlation are used. The effect of four selected parameters (ambient temperature, ambient humidity ratio, total number of transfer units and fresh air flowrate), and the summer energy saving potential in three different cities are studied. The analysis results show that the new dew point configuration has the best performance under the conditions of high temperature, high humidity, and high fresh air flowrate. This new dew point cooler's hybrid system achieves the best energy saving rate in humid and arid climates, between 19.1% and 48.5% compared with the pure mechanical vapor compression system. In this study, the advantages and disadvantages of presented designs are established and their application potential under different climates is estimated. © 2021 Elsevier Ltd
语种：
英文
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Risk Analysis of Out-drum Mixing Cement Solidification by HAZOP and Risk Matrix
作者：
Wang, Rui;Wang, Jingsong*
期刊：
Annals of Nuclear Energy ,2020年147:107679 ISSN：0306-4549
通讯作者：
Wang, Jingsong
作者机构：
[Wang, Rui] Univ South China, Sch Resource Environm & Safety Engn, Hengyang 421001, Hunan, Peoples R China.;[Wang, Jingsong] Univ South China, Sch Civil Engn, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Wang, Jingsong] U;Univ South China, Sch Civil Engn, Hengyang 421001, Hunan, Peoples R China.
关键词：
Cement solidification;HAZOP;Out-drum mixing;Risk analysis;Risk matrix
摘要：
Due to the particularity and complexity of cement solidification, radioactive waste may be released and diffused, causing serious radioactive hazards to equipment, operators and environment. In this study, hazard and operability analysis (HAZOP) and risk matrix were combined to identify and evaluate risks of out-drum mixing cement solidification. Firstly, based on concept and steps of HAZOP, the meaningful deviations of out-drum mixing equipment were described by appropriate guidewords and process parameters. Secondly, the causes and consequences of deviation, and the safety measures were investigated. Finally risk matrix was applied to classify risk level and assess risk of the identified deviation. Results indicated that low level of wet waste in storage and weighing tank, less flow of wet waste in feeding pipe of storage and weighing tank, mixer without mixing speed, high transport speed and additional location of drum are unacceptable risks. The relevant safety suggestions were given to reduce or eliminate potential hazards. © 2020 Elsevier Ltd
语种：
英文
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纳米铁的绿色合成及其在环境中的应用研究进展
作者：
刘清;邓真宁;滑熠龙;招国栋
期刊：
化工进展 ,2020年39(5):1950-1963 ISSN：1000-6613
通讯作者：
Liu, Qing(liuqing197901@163.com)
作者机构：
[刘清; 邓真宁] Hunan Province Key Laboratory of Pollution Control and Resources Reuse Technology, University of South China, Hengyang;Hunan;421001, China;[滑熠龙] Key Discipline Laboratory for National Defence for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang;[招国栋] School of Resource & Environment and Safety Engineering, University of South China, Hengyang
关键词：
纳米粒子;纳米零价铁;铁氧化物;绿色合成;环境;污染
摘要：
纳米铁(零价铁及铁氧化物)比表面积大、还原能力强、反应活性高,是一种良好的环境功能材料。传统的纳米铁合成方法中,物理方法对反应所需仪器设备要求较高,化学方法使用的还原剂具有毒性,绿色合成方法能够有效克服传统方法的不足之处。本文首先根据合成途径、纳米铁的类型介绍了利用植物和微生物对纳米零价铁(nZVI)及纳米铁氧化物(IONPs)进行绿色合成的方法,同时论述了制备的纳米铁所表现的特征(如形貌、尺寸、聚集倾向、等电位点)。随后总结了纳米铁通过不同反应机制(吸附、还原、催化氧化)去除环境有机、无机污染物(染料、芳香族化合物、硝酸盐、重金属)的应用。最后指出了纳米铁在绿色合成与实际应用过程中存在的挑战性问题及解决方法,以期为纳米铁今后的深入研究和大规模的工业生产应用提供参考依据。
语种：
中文
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Microbial characteristic and bacterial community assessment of sediment sludge upon uranium exposure
作者：
Zeng, Taotao* ;Mo, Guanhai;Hu, Qing;Wang, Guohua;Liao, Wei;...
期刊：
Environmental Pollution ,2020年261(Jun.):114176.1-114176.9 ISSN：0269-7491
通讯作者：
Zeng, Taotao
作者机构：
[Liao, Wei; Xie, Shuibo; Mo, Guanhai; Zeng, Taotao; Wang, Guohua; Hu, Qing] Univ South China, Hunan Prov Key Lab Pollut Control & Resources Reu, Hengyang 421001, Peoples R China.;[Xie, Shuibo] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.
通讯机构：
[Zeng, Taotao] U;Univ South China, Hunan Prov Key Lab Pollut Control & Resources Reu, Hengyang 421001, Peoples R China.
关键词：
Uranium;Bacterial community;High-throughput sequencing;Microbial characteristic
摘要：
The microbial characteristics and bacterial communities of sediment sludge upon different concentrations of exposure to uranium were investigated by high solution transmission electron microscopy (HRTEM), energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS) and high-throughput sequencing. After exposure to initial uranium concentrations of 10–50 μM for 24 h in synthetic wastewater, the removal efficiencies of uranium reached 80.7%–96.5%. The spherical and short rod bacteria were dominant in the sludge exposed to uranium. HRTEM-EDS and XPS analyses indicated that reduction and adsorption were the main mechanisms for uranium removal. Short-term exposure to low concentrations of uranium resulted in a decrease in bacterial richness but an increase in diversity. A dramatic change in the composition and abundances of the bacterial community were present in the sediment sludge exposed to uranium. The highest removal efficiency was identified in the sediment sludge exposed to 30 μM uranium, and the dominant bacteria included Acinetobacter (44.9%), Klebsiella (20.0%), Proteiniclasticum (6.7%), Enterobacteriaceae (6.6%), Desulfovibrio (4.4%), Porphyromonadaceae (4.1%), Comamonas (2.4%) and Sedimentibacter (2.3%). By comparison to the inoculum sediment sludge, exposure to uranium caused a substantial difference in the majority of bacterial abundance. © 2020 Elsevier Ltd
语种：
英文
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Thermal buoyancy driven flows inside a differentially heated enclosure with porous fins of multiple morphologies attached to the hot wall
作者：
Wang, Lei;Liu, Run-Zhe;Liu, Di;Zhao, Fu-Yun* ;Wang, Han-Qing
期刊：
International Journal of Thermal Sciences ,2020年147:106138 ISSN：1290-0729
通讯作者：
Zhao, Fu-Yun
作者机构：
[Liu, Run-Zhe; Zhao, Fu-Yun; Wang, Lei] Wuhan Univ, Minist Educ, Key Lab Hydraul Machinery Transients, Wuhan, Hubei, Peoples R China.;[Liu, Run-Zhe; Zhao, Fu-Yun; Wang, Lei] Wuhan Univ, Hubei Key Lab Waterjet Theory & New Technol, Wuhan, Hubei, Peoples R China.;[Liu, Run-Zhe; Zhao, Fu-Yun; Wang, Lei] Wuhan Univ, Sch Power & Mech Engn, Dong Hu South Rd, Wuhan 430072, Hubei, Peoples R China.;[Liu, Di] China Univ Petr, Coll Pipeline & Civil Engn, Qingdao, Shandong, Peoples R China.;[Wang, Han-Qing] Univ South China, Sch Civil Engn, Hengyang, Hunan, Peoples R China.
通讯机构：
[Zhao, Fu-Yun] W;Wuhan Univ, Sch Power & Mech Engn, Dong Hu South Rd, Wuhan 430072, Hubei, Peoples R China.
关键词：
Enclosure natural convection;Porous fins;Electronic cooling morphology;Numerical heat transfer and fluid flow
摘要：
The application of porous media for electronic cooling process, instead of solid one, generally strengthens heat conduction while weakens convection insignificantly at high Darcy number. In the present work, effects of morphology and topology of porous fins on the laminar natural convection heat transfer were investigated in a differentially heated enclosure. Volume averaged Darcy-Forchheimer model was applied to solve the transport process within the porous media while the Navier-Stokes equations were employed within pure fluid region. Relevant governing parameters, including thermal Rayleigh number, Darcy number, thermal conductivity of the porous matrix, designs of porous fins, are sensitively varied to identify their effects and roles on the natural convection flows. Depending on thousands of numerical data, the correlation has been developed for all designs of porous fins. Numerical results illustrate that the adding porous fins with excellent permeability and heat conduction contribute to the remarkable heat transfer enhancement while the adding fins, acting like solid ones and having poor heat conduction, could result in an increase of thermal resistance and the deterioration of heat transfer. Numerical results further show that there exists an optimal design of porous fins to achieve the best performance of heat transfer if some conditions were satisfied. Overall, this study could benefit the electronic cooling by the installation of porous-alike materials.<br/> ©2019 Elsevier Masson SAS
语种：
英文
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废玻璃粉混凝土单轴受压应力-应变全曲线试验研究
作者：
焦楚杰;李松;甘元初
期刊：
东南大学学报(自然科学版) ,2020年50(2):222-230 ISSN：1001-0505
作者机构：
[焦楚杰; 李松] School of Civil Engineering, Guangzhou University, Guangzhou;510006, China;[甘元初] School of Civil Engineering, University of South China, Hengyang;421001, China;[焦楚杰; 李松] 510006, China
关键词：
废玻璃粉混凝土;单轴受压;应力-应变全曲线;峰值应力;延性系数
摘要：
为研究废玻璃粉混凝土单轴受压作用下的全过程受力特征,对C30与C50两类强度等级,0%、10%、15%、20%、25%、30%六种取代率下的棱柱体试件进行单轴受压应力-应变全曲线试验.通过试验分析了应力-应变全过程曲线变化趋势,对比研究了比例极限、峰值应力、延性系数等性能指标,并采用分段式本构关系对废玻璃粉混凝土应力-应变全曲线进行了研究.结果表明:废玻璃粉混凝土应力-应变全曲线形状与普通混凝土相似,随着取代率的增加,上升段斜率逐渐变小,下降段则趋于平缓,各类取代率下均值曲线的标准差先增大后减小,直至保持不变;与普通混凝土相比,废玻璃粉混凝土的比例极限相对较小,峰值应变则较大,延性较好的原因在于上升段表现出的塑性变形较强;分段式本构方程计算所得曲线与试验所测曲线吻合良好,C30强度等级下上升段参数为2.146,下降段参数为0.8,C50强度等级下上升段参数为1.987,下降段参数为1.462.
语种：
中文
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Heatstroke recovery at home as predicted by human thermoregulation modeling
作者：
Zhao, Jinping;Wang, Hanqing;Li, Yuguo;Xiao, Fang;Deng, Qihong*
期刊：
Building and Environment ,2020年173:106752 ISSN：0360-1323
通讯作者：
Deng, Qihong
作者机构：
[Zhao, Jinping; Deng, Qihong] Cent South Univ, Sch Energy Sci & Engn, Changsha, Hunan, Peoples R China.;[Zhao, Jinping; Wang, Hanqing] Univ South China, Sch Civil Engn, Hengyang, Hunan, Peoples R China.;[Wang, Hanqing] Univ South China, Prov Engn Lab Hunan Technol Bldg Environm Control, Hengyang, Hunan, Peoples R China.;[Li, Yuguo] Univ Hong Kong, Dept Mech Engn, Hong Kong, Peoples R China.;[Xiao, Fang; Deng, Qihong] Cent South Univ, XiangYa Sch Publ Hlth, Changsha, Hunan, Peoples R China.
通讯机构：
[Deng, Qihong] C;Cent South Univ, Sch Energy Sci & Engn, Changsha, Hunan, Peoples R China.
关键词：
Cooling treatment;Core temperature;Heat wave;Hypothermia;Indoor environment;Thermoregulatory model
摘要：
Background: As global warming continues, incidences of heatstroke will become more prevalent. Since most deaths occur at home, timely and effective in-home treatment is critical to reduce heatstroke mortality. However, in-home treatment is limited by lack of knowledge and guidance. Objectives: To predict the course of heatstroke recovery over time for different home environment conditions, so as to provide useful information and technical guidance for heatstroke treatment. Methods: We suggested a new multi-node human thermoregulatory model by considering the effect of thermoregulatory impairment, delayed shivering and vasoconstriction, due to heatstroke on the course of recovery. The role of home environmental conditions in the course of heatstroke recovery was examined, to identify optimal treatment conditions. Results: Our thermoregulation modeling shows that the course of body core temperature during heatstroke recovery consists of three distinct stages: a rapid cooling stage due to vasodilation, a slower cooling stage due to vasoconstriction and a rewarming stage due to shivering. Our modeling results showed that hypothermia is a necessary condition for successful recovery, which cannot be achieved by the classical thermoregulatory model. We found that lower indoor temperature or higher ventilation can accelerate the cooling stage and that a higher indoor temperature or lower ventilation would be helpful in the rewarming stage, which indicated an optimal indoor condition for improving the recovery of heatstroke. To improve the chances of a full recovery, it is also necessary to carry out cooling treatment for a heatstroke patient as early as possible. Our new model was validated by rat experiments and the available human data. Conclusions: Onsite treatment of heatstroke should begin as early as possible. Our new thermoregulatory model can predict the course of body temperature changes overtime during heatstroke recovery, and hence may be used to develop effective in-home treatments. © 2020 Elsevier Ltd
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英文
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