Sorption and desorption of radiocobalt on montmorillonite - Effects of pH, ionic strength and fulvic acid

被引：23
|
作者：
Chen, Lei [1 ]
Lu, Songsheng [2 ]
机构：
[1] Shandong Univ Technol, Sch Chem Engn, Zibo 255049, Shandong, Peoples R China
[2] New Star Inst Appl Technol, Hefei, Anhui, Peoples R China
来源：
APPLIED RADIATION AND ISOTOPES | 2008年 / 66卷 / 03期
关键词：
montmorillonite; radiocobalt; sorption; desorption;
D O I：
10.1016/j.apradiso.2007.07.031
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
Humic substances and clay minerals have been studied extensively in radioactive waste management. In our research, the sorption and desorption of radiocobalt on montmorillonite in the presence and absence of fulvic acid as a function of pH and ionic strength were investigated under ambient conditions by using batch techniques. The results indicate that the sorption of cobalt is strongly dependent on pH values and independent of ionic strength. Surface complexation rather than cation exchange is considered as the main mechanism of cobalt sorption to montmorillonite. The presence of fulvic acid enhances cobalt sorption obviously at pH values < 8. The desorption behavior changes of surface-sorbed cobalt from montmorillonite were studied by decreasing pH values and the solution cobalt concentrations independently. The results indicated that the sorption of cobalt on montmorillonite is irreversible. (c) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码：288 / 294
页数：7
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