Effect of solution properties on the interaction of 90Sr(II) with GMZ bentonite

Xin Chen; Jin Wang; Shaowei Wang; Fengliang Ma; Xiaopeng Chen; Jiaxing Li

Korean Journal of Chemical Engineering, Vol.32, No.11, 2264-2272, November, 2015

DOI10.1007/s11814-015-0045-7 Export Citation

Effect of solution properties on the interaction of 90Sr(II) with GMZ bentonite

Xin Chen, Jin Wang, Shaowei Wang¹, Fengliang Ma², Xiaopeng Chen, and Jiaxing Li^{3, †}

School of Resources & Environmental Engineering, Hefei University of Technology, No. 193 Tunxi Road, Hefei 230009, Anhui Province, China
¹Nuclear and Radiation Safety Center, Ministry of Environment Protection of the People’s Republic of China, Beijing 100082, China
²Research Institute of Petroleum Exploration & Development-Northwest, Petrochina, Lanzhou, China
³Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, P. R. China

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The bentonite from gaomiaozi county (Inner Mongolia, China) (GMZ bentonite) has been selected as the candidate of backfill material in China for nuclear waste repository. Herein, the sorption of 90Sr(II) on GMZ bentonite was investigated as a function of contact time, solid content, pH, ionic strength, foreign ions, humic acid (HA) and temperature. The results indicated that the sorption of 90Sr(II) was mainly dominated by ion exchange or outer-sphere surface complexation at low pH, whereas inner-sphere surface complexation was the main sorption mechanism at high pH values. The thermodynamic parameters (ΔH0, ΔS0 and ΔG0) calculated from the temperature-dependent sorption isotherms indicated that the sorption of 90Sr(II) on GMZ bentonite was an endothermic and spontaneous process. The results provided important information for the interaction mechanism of 90Sr(II) with GMZ bentonite, and is crucial for the evaluation of GMZ bentonite as backfill material.

Keywords:GMZ Bentonite;90Sr(II);Sorption;Kinetic;Thermodynamic Data

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[3] Shao DD, Hou GS, Li JX, Wen T, Ren XM, Wang XK, Chem. Eng. J., 255, 604 (2014)

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[18] Liu YM, Chen ZR, Acta. Mineral. Sin., 21, 541 (2001)

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[21] Tao ZY, Zhang J, Zhai JJ, Anal. Chim. Acta, 395, 199 (1999)

[22] Tan XL, Fan QH, Wang XK, Grambow B, Environ. Sci. Technol., 43, 3115 (2009)

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