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

doi:10.3969/j.issn.0438-1157.2012.12.047

CIESC Journal ›› 2012, Vol. 63 ›› Issue (12): 4068-4074.DOI: 10.3969/j.issn.0438-1157.2012.12.047

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

LI Xiaoyan^1,2, HUA Ming¹, LIU Yibao¹, LIU Yunhai¹, GAO Bai¹

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, China;
2. China Institute of Atomic Energy, Beijing 102413, China

Received:2012-05-26 Revised:2012-08-18 Online:2012-09-04 Published:2012-12-05
Supported by:
supported by the National Natural Science Foundation of China(41162007,11205030),the State Key Laboratory Breeding Base of Nuclear Resources and Environment(101111)and the Fundamental Science on Radioactive Geology and Exploration Technology Laboratory (2011RGET06).

改性玉米芯吸附溶液中U(Ⅵ)的动力学和热力学

李小燕^1,2, 花明¹, 刘义保¹, 刘云海¹, 高柏¹

1. 核资源与环境省部共建国家重点实验室培育基地, 放射性地质勘探与技术国防重点学科实验室, 东华理工大学, 江西南昌 330013;
2. 中国原子能科学研究院, 北京 102413

通讯作者: 李小燕
作者简介:李小燕(1974-),女,博士研究生,讲师。
基金资助:
国家自然科学基金项目(41162007,11205030);核资源与环境省部共建国家重点实验室培育基地项目(101111);放射性地质勘探与技术国防重点学科实验室项目(2011RGET06)。

Abstract

Abstract: 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 E_a and average adsorption energy E_s 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.

Key words: potassium permanganate, modification, corncob, uranium, adsorption

关键词: 高锰酸钾, 改性, 玉米芯, 铀, 吸附

CLC Number:

TQ317

LI Xiaoyan, HUA Ming, LIU Yibao, LIU Yunhai, GAO Bai. Kinetics and thermodynamics of U(Ⅵ) adsorption from aqueous solution by modified corncob[J]. CIESC Journal, 2012, 63(12): 4068-4074.

李小燕, 花明, 刘义保, 刘云海, 高柏. 改性玉米芯吸附溶液中U(Ⅵ)的动力学和热力学[J]. 化工学报, 2012, 63(12): 4068-4074.

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

改性玉米芯吸附溶液中U(Ⅵ)的动力学和热力学

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