Interpretation of the interaction between cesium ion and some clay minerals based on their structural features
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RESEARCH ARTICLE
Interpretation of the interaction between cesium ion and some clay minerals based on their structural features Yasuhiro Akemoto 1,2
&
Satya Candra Wibawa Sakti 1,3,4 & Masahiko Kan 5 & Shunitz Tanaka 1,6,7
Received: 4 August 2020 / Accepted: 28 October 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Cesium (Cs+) is known to have a strong interaction with various clay minerals; however, it is not interpreted from the structure of clay minerals and the adsorption isotherm. The adsorption interactions between Cs+ and hydrobiotite (H-Bio), biotite (Bio), vermiculite (Verm), and exfoliated vermiculite (E-Verm) were evaluated by analyzing adsorption isotherm, basal spacing, and adsorption/desorption experiments. The Cs+ adsorption of H-Bio and Verm fitted well to the Langmuir adsorption isotherm, while the Cs+ adsorption of Bio and E-Verm fitted well to the Freundlich adsorption isotherm. The basal spacing of H-Bio and Verm was approximately 1.4 nm, while Bio and E-Verm basal spacing was 1.0 nm. The adsorption experiment results for Cs+ under the coexistence of Ca2+ and K+ indicated that the contribution of the interlayer sites to Cs+ adsorption on H-Bio and Verm was 25–40%, while the contribution of the interlayer sites to that on Bio and E-Verm was almost 0%. The adsorption isotherms reflected this interlayer contribution to Cs+ adsorption, which was dependent on the basal spacing. Therefore, the basal spacing of clay minerals is one of the key structural properties controlling both the adsorption capacity and the adsorption mechanism of Cs+ in clay minerals. Keywords Biotite . Vermiculite . Cesium . Weathering . Basal spacing . Interlayer . Adsorption isotherm
Introduction Clay minerals are widely distributed and ubiquitous occurring in a variety of environments. Clay minerals play important roles in the migration and movement of substances in the soil through chemical interactions, such as adsorption and ion-exchange mechanisms. In 2011, the Fukushima Daiichi Nuclear Power
Plant disaster in Japan caused an enormous spread of various radionuclides over the environment (Sato 2011; Toriyama et al. 2018). Many radioactive species were released (Chino et al. 2011), and the volume of contaminated soils with radionuclides was estimated to be 21.4 Mm3 (Hashimoto et al. 2012). Radioactive 137Cs which has a 30-year half-life was one of the main radionuclides released into the surrounding Fukushima
Responsible Editor: Kitae Baek * Yasuhiro Akemoto [email protected]
4
Supramodification Nano-Micro Engineering Research Group, Universitas Airlangga, Campus C, Mulyorejo, Surabaya 60115, Indonesia
5
Environmental Information Measurement Sciences, Hokkaido University of Education Sapporo, Ainosato 5-3, Kita-ku, Sapporo 002-8502, Japan
6
Faculty of Environmental Earth Science, Hokkaido University, Kita 10 Nishi 5, Kita-ku, Sapporo 060-0810, Japan
7
ES General Laboratory Co., Nakanuma Nishi 5-1-8-1, Higashi-ku, Sapporo, Hokkaido 007-0895, Japan
* Shunitz Tanaka shunit
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