Abstract
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 °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.
| Original language | English |
|---|---|
| Pages (from-to) | 49-54 |
| Number of pages | 6 |
| Journal | Geoderma |
| Volume | 340 |
| DOIs | |
| Publication status | Published - 15 Apr 2019 |
Keywords
- Cesium adsorption
- Clay minerals
- Expanding
- Interlayer fixation
- Weathering
ASJC Scopus subject areas
- Soil Science