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Radiochimica Acta

International Journal for chemical aspects of nuclear science and technology

Ed. by Qaim, Syed M.


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Effect of pH and ionic strength on sorption of Eu(III) to MX-80 bentonite: batch and XAFS study

G. D. Sheng1 / Dadong D. Shao2 / Qiao Hui Fan3 / Di Xu4 / Y. X. Chen5 / X. K. Wang*

1 North China Electric Power University, School of Nuclear Science and Engineering, Beijing, Volksrepublik China

2 Chinese Academy of Sciences, Institute of Plasma Physics, Hefei, Volksrepublik China

3 Institute of Plasma Physics, Chinese Academy of Sciences, Heifei, Volksrepublik China

4 Chinese Academy of Sciences, Institute of Plasma Physics, Hefei, Volksrepublik China

5 North Electric Power University, School of Nuclear Science and Engineering, Beijing, Volksrepublik China

* Correspondence address: School of Nuclear Science and Engineering, North China Electric Power University, 102206 Beijing, Volksrepublik China,

Citation Information: Radiochimica Acta International journal for chemical aspects of nuclear science and technology. Volume 97, Issue 11, Pages 621–630, ISSN (Print) 0033-8230, DOI: 10.1524/ract.2009.1656, December 2009

Publication History

Published Online:
2009-12-04

Abstract

Sorption of radionuclides on MX-80 bentonite has been studied extensively because of its high sorption capacity and low penetrability. Herein, MX-80 bentonite was characterized by acid–base titration, XRD and FTIR in detail. The sorption of Eu(III) from aqueous solution to MX-80 bentonite was investigated as a function of contact time, solid content, ionic strength and pH under N2 conditions. The experimental data was performed with the diffuse layer model (DLM) with the aid of FITEQL 3.1 code. The site densities are 2.52×10−4 mol/g for [≡XOH] and 1.54×10−4 mol/g for [≡YOH], and acidity constants as pKa are pKXO=6.772, pKYOH2+=−1.68, and pKYO=4.145. The sorption of Eu(III) on MX-80 bentonite consists of ≡YOEu2+ species at low pH values and ≡XOEu(OH)+ species at high pH values. The sorption isotherms were simulated by Langmuir, Freundlich and Dubini–Radushkevich (D–R) models, respectively, and the results indicated that Langmuir model fitted the sorption data better than the Langmuir and D–R models. XAFS technique was applied to characterize the local structural environment of the adsorbed Eu(III), and the results indicated that Eu(III) was bond to O atoms at a distance of about 2.43 Å as ≡Y/XO-Eu2+ at low pH values.

Keywords: MX-80 betonite; Eu(III); Sorption; pH; XAFS

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