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Sono-assisted preparation of Fe(II)-Al(III) layered double hydroxides and their application for removing uranium (VI)

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成果类型:
期刊论文
作者:
Xie, Lixia;Zhong, Yu;Xiang, Renjun;Fu, Guangyi;Xu, Youze;Cheng, Yingxiang;Liu, Zhan;Wen, Tao;Zhao, Yuanyuan;Liu, Xingqun
通讯作者:
Zhong, Y.
作者机构:
[Xiang, Renjun; Wen, Tao; Xie, Lixia; Zhong, Yu; Cheng, Yingxiang; Zhao, Yuanyuan; Liu, Zhan; Xu, Youze; Fu, Guangyi] Key Laboratory of Water Pollution Control Technology, Hunan Research Academy of Environmental Sciences, Changsha, 410004, China
[Liu, Xingqun] Institute of Urban Construction, University of South China, Hengyang, 421001, China
[Xie, Lixia] State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China
通讯机构:
[Zhong, Y; Xiang, RJ] Hunan Res Acad Environm Sci, Key Lab Water Pollut Control Technol, Changsha 410004, Hunan, Peoples R China.
语种:
英文
关键词:
Adsorption;Fe(II)-Al(III) layered double hydroxides;Reaction mechanisms;Ultrasound irradiation;Uranium
期刊:
Chemical Engineering Journal
ISSN:
1385-8947
年:
2017
卷:
328
页码:
574-584
基金类别:
project of the International Science & Technology Cooperation Program of China [2013DFG91190]; Natural Science Foundation of Hunan Province [2017JJ3148]
机构署名:
本校为其他机构
院系归属:
土木工程学院
摘要:
Fe(II)-Al(III) layered double hydroxides (Fe-Al LDHs) were prepared by the sono-assisted precipitation method and used for the removal of uranium (VI) from aqueous solutions. The application of ultrasound in the Fe-Al LDHs preparation promoted the formation of the hydrotalcite-like phase and improved the adsorption capacity of U(VI). Batch experiments were carried out to investigate the influence of solid-to-solution ratio, initial U(VI) concentration, initial pH, contact time and temperature on the U(VI) removal process. The experimental results indicated that the removal process of U(VI) could be well described by the pseudo-second-order kinetic model. The equilibrium isotherm for U(VI) removal was fitted by the Langmuir model and the maximum adsorption capacity of Fe-Al LDHs was 113.64 mg/g at a temperature of 308 K. The thermodynamic parameters implied that the removal of U(VI) was essentially an endothermic process. The FT-IR, EDX and XPS results suggested that the removal mechanism involves combined adsorption-reduction processes. When the U(VI) ions absorbed onto the Fe-Al LDHs through physical adsorption, the Fe(II) in the structure of Fe-Al LDHs reduces U(VI) to U(IV) while Fe(II) was oxidized to Fe(III). (C) 2017 Elsevier B.V. All rights reserved.

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