Chiang Mai Journal of Science

Print ISSN: 0125-2526 | eISSN : 2465-3845

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Sorption Studies of Cesium on Kunipia-F Bentonite and Silicon Dioxide

Anan O-Manee, Youichi Enokida and Kayo Sawada
* Author for corresponding; e-mail address: anan@tint.or.th
Volume: Vol.49 No.5 (September 2022)
Research Article
DOI: https://doi.org/10.12982/CMJS.2022.093
Received: 18 May 2022, Revised: 2 August 2022, Accepted: 22 August 2022, Published: -

Citation: O-manee A., Enokida Y. and Sawada K., Sorption studies of cesium on Kunipia-F bentonite and silicon dioxide. Chiang Mai Journal of Science, 2022; 49(5): 1452-1457. DOI 10.12982/CMJS.2022.093.

Abstract

     Adsorption is one of the effective methods used for the removal of contaminants from radioactive wastewater. In this research, removal efficiency of Cs from the prepared low-concentration Cs solution (100 μg/L) was studied using two different adsorbents namely high purity Kunipia-F bentonite and Silicon dioxide (SiO2). After performing the adsorption tests, the Cs ions in liquid and solid phases were analyzed using the inductively coupled plasma mass spectrometry (ICP-MS) technique. The adsorption capacities of both materials were then compared. It was found that the Cs adsorption capacity of bentonite was higher than that of SiO2. The distribution coefficient of Cs in the bentonite was 1.0 L-sol/g-solid, which was 100 times greater than that of SiO2. The highest sorption of Cs on bentonite could be attributed to its smaller particle size (0.362 μm), compared to the SiO2 particle size (0.625 μm). Bentonite is natural clay and is generally used as a buffer material in geological disposal systems for high-level nuclear waste. The results of this research indicate that bentonite could be an effective absorbent for decontaminating low concentration Cs in radioactive wastewater.

Keywords: cesium removal, bentonite, silicon dioxide, adsorption, radioactive wastewater

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