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 Xiaoyan1,2, HUA Ming1, LIU Yibao1, LIU Yunhai1, GAO Bai1   

  1. 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. 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: 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(ΔHS 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: