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Received December 3, 2014
Accepted February 25, 2015
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Effect of solution properties on the interaction of 90Sr(II) with GMZ bentonite
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
lijx@ipp.ac.cn
Korean Journal of Chemical Engineering, November 2015, 32(11), 2264-2272(9), 10.1007/s11814-015-0045-7
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Abstract
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.
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