期刊
GEODERMA
卷 340, 期 -, 页码 49-54出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.geoderma.2018.12.002
关键词
Cesium adsorption; Clay minerals; Interlayer fixation; Expanding; Weathering
类别
资金
- KAERI (Korea Atomic Energy Research Institute) through 'NERI (Nuclear Energy Research Initiative) project' [2016M2A8A5023890]
- KEITI (Korea Environmental Industry and Technology Institute) through GALA project [2015000550008]
The fate and transport of cesium (Cs+) is strongly related to the presence of clay minerals in soils, and their weathering due to natural cycles of wetting and drying. In this study, the adsorption characteristics of Cs+ under repeated wetting and drying conditions were investigated using the 1:1 lattice clay mineral, kaolinite, the, non-expanding 2:1 lattice clay mineral, illite, and the expanding 2:1 lattice clay minerals, hydrobiotite and montmorillonite. Unlike the cation exchange capacity of clay minerals (montmorillonite > hydrobiotite > illite > kaolinite), the amount of Cs+ adsorbed followed the order of hydrobiotite > montmorillonite > illite > kaolinite. The expanding 2:1 lattice clay minerals (hydrobiotite and montmorillonite) displayed a fixed d-spacing when Cs+ was adsorbed and dried, after which they had a structure similar to that of illite. The desorption efficiency of Cs+ in illite and montmorillonite also was lowered after drying at 80 degrees C. Desorption efficiencies of Cs+ in clay minerals were in the order of kaolinite > illite > montmorillonite > hydrobiotite. Therefore, there are differences on desorption efficiencies of Cs according to clay minerals due to each clay mineral structure and characteristics.
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