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

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• 作者：Xin Chen ; Jin Wang ; Shaowei Wang ; Fengliang Ma…
• 关键词：GMZ Bentonite ; 90Sr(II) ; Sorption ; Kinetic ; Thermodynamic Data
• 刊名：Korean Journal of Chemical Engineering
• 出版年：2015
• 出版时间：November 2015
• 年：2015
• 卷：32
• 期：11
• 页码：2264-2272
• 全文大小：784 KB
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• 作者单位：Xin Chen (1)
  Jin Wang (1)
  Shaowei Wang (2)
  Fengliang Ma (3)
  Xiaopeng Chen (1)
  Jiaxing Li (4)
  
  1. School of Resources & Environmental Engineering, Hefei University of Technology, No. 193 Tunxi Road, Hefei, 230009, Anhui Province, China
  2. Nuclear and Radiation Safety Center, Ministry of Environment Protection of the People’s Republic of China, Beijing, 100082, China
  3. Research Institute of Petroleum Exploration & Development-Northwest, Petrochina, Lanzhou, China
  4. Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, Suzhou, P. R. China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Industrial Chemistry and Chemical Engineering
  Catalysis
  Materials Science
  Biotechnology
  
• 出版者：Springer New York
• ISSN：1975-7220

文摘

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.