Selective adsorption and irreversible fixation behavior of cesium onto 2:1 layered clay mineral: A mini review

Journal of Hazardous Materials
Sang-Min ParkKitae Baek

Abstract

In this study, we reviewed the selective adsorption and irreversible fixation of cesium (Cs+) on clay minerals. The selective adsorption of Cs+ results from reactions with frayed edge sites (FES) of clay minerals. The content of FES is about 0.1-2.0% of the total cation exchange capacity (CEC). The fractionation of Cs+ in actual accident sites mainly exists as a residue, which is important because it is closely related to the strong binding between Cs+ and soils. Cs+ adsorbed onto FES can move into the deeper interlayer via weathering processes, thereby Cs+ can be irreversibly fixed in the interlayer of non-expanding 2:1 layered clay mineral. Additionally, Cs+ can be adsorbed in the interlayer of the expanding clay mineral and can be fixed by interlayer collapse. For this reason, Cs+ adsorption onto FES is defined as 'selective adsorption' subsequent sorption in the interlayer as 'irreversible fixation'. Furthermore, the extended X-ray absorption fine structure (EXAFS) analysis can confirm that Cs+ bound to illite is coordinated with the outer surface (OOS) and interlayer surface oxygens (OIS) through FES or interlayer sites. Through these processes, Cs+ is adsorbed selectively onto FES, while Cs+ can subsequently move into the...Continue Reading

Citations

Jul 1, 2020·Environmental Science and Pollution Research International·Sung-Man KimSo-Jin Park
May 16, 2019·Environmental Science. Processes & Impacts·Wey-Tsang LiuChih-Hao Lee
Jul 25, 2020·Environmental Geochemistry and Health·Sang-Min ParkKitae Baek
Nov 28, 2020·Journal of Hazardous Materials·Shangqing ChenTianlong Deng
Mar 29, 2021·Journal of Environmental Radioactivity·Chan Woo ParkBum Kyung Seo

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