Kinetics and thermodynamics of U(VI) adsorption from aqueous solution by modified corncob

被引：0
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作者：
Li, Xiaoyan [1 ,2 ]
Hua, Ming [1 ]
Liu, Yibao [1 ]
Liu, Yunhai [1 ]
Gao, Bai [1 ]
机构：
[1] State Key Laboratory Breeding Base of Nuclear Resources and Environment, Fundamental Science on Radioactive Geology and Exploration Technology Laboratory, East China Institute of Technology, Nanchang 330013, Jiangxi
[2] China Institute of Atomic Energy
来源：
Huagong Xuebao/CIESC Journal | 2012年 / 63卷 / 12期
关键词：
Adsorption; Corncob; Modification; Potassium permanganate; Uranium;
D O I：
10.3969/j.issn.0438-1157.2012.12.047
中图分类号：
学科分类号：
摘要：
The corncob was microwave-assistedly modified by KMnO4 and used for adsorption of U(VI) ions from aqueous solution. The kinetics and thermodynamics of their adsorption were measured using batch experiments. The results show that the kinetics of adsorption follows well the pseudo-second order equation, indicating that the uranium adsorption by the modified corncob is mainly chemisorption. The Langmuir, Freundlich and D-R isothermal adsorption models were used to relate the equilibrium data, finding that Langmuir isotherm of monolayer adsorption is better fitting them, pointing out that the adsorption mainly occurs on surface active sites of modified corncob. The values of apparent activation energy Ea and average adsorption energy Es support also the suggestion that adsorption of U(VI) on modified corncob is mainly chemisorption, although some physical adsorption can not be got rid of. The thermodynamic parameters (ΔH, ΔS and ΔG) calculated from the adsorption isotherms at various temperatures indicated that the adsorption of U(VI) on modified corncob is an endothermic, spontaneous process and more favorable at higher temperature. © All Rights Reserved.
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页码：4068 / 4074
页数：6
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