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

LI Xiaoyan; HUA Ming; LIU Yibao; LIU Yunhai; GAO Bai

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

更新时间：2025-12-10

- Kinetics and thermodynamics of U(Ⅵ) adsorption from aqueous solution by modified corncob
- CIESC Journal Issue 12, Pages: 4068-4074(2012)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0438-1157.2012.12.047
  CLC： Q317
- Online First：04 September 2012，
  
  Published：04 September 2012
- 稿件说明：
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LI Xiaoyan, HUA Ming, LIU Yibao, et al. Kinetics and thermodynamics of U(Ⅵ) adsorption from aqueous solution by modified corncob[J]. CIESC Journal, 2012, (12): 4068-4074.
DOI：

LI Xiaoyan, HUA Ming, LIU Yibao, et al. Kinetics and thermodynamics of U(Ⅵ) adsorption from aqueous solution by modified corncob[J]. CIESC Journal, 2012, (12): 4068-4074. DOI： 10.3969/j.issn.0438-1157.2012.12.047.

摘要

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(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.

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