Research on Adsorption and Desorption Behavior of Pu on Bentonites for Buffer Backfill Material

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• 作者：Huailiang Li^a ; ^{li-huai-liang@163.com" class="auth_mail" title="E-mail the corresponding author} ; Yangchun Leng^b ; Xianguo Tuo^a ; ^b
• 关键词：239Pu ; Bentonite ; Adsorption ; Desorption
• 刊名：Procedia Environmental Sciences
• 出版年：2016
• 出版时间：2016
• 年：2016
• 卷：31
• 期：Complete
• 页码：401-407
• 全文大小：245 K

文摘

To the chemical behavior of Pu on backfill material for high-level radioactive waste repository. Adsorption and desorption of Pu on Natural bleaching earth, Na-bentonite, GMZ-bentonite, Ca-bentonite, acid-Ca-bentonite and alk-Ca-bentonite are discussed in this paper. Data analysis shows that adsorption abilities of Ca-bentonite, alk-Ca-bentonite, Ca-bentonite are greater than GMZ-bentonite, Natural bleaching earth, Na-bentonite, and in which Na-bentonite is relatively minimal. Desorption abilities of Na-bentonite, acid-Ca-bentonite are greater than alk-Ca-bentonite, Ca-bentonite, GMZ-bentonite, Natural bleaching earth, and in which GMZ-bentonite and Natural bleaching earth are relatively minimal. When the pH of the water phase is 1 or 13, the adsorption ability of Ca-bentonite is changed obviously. One reason is that the degree of surface complex reaction has been changed. Another reason is that the compositions and structure of Ca-bentonite have been also changed after acidizing or alkalosis by H⁺ or OH^− in the water phase.