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Technologies 2018, 6(3), 78; https://doi.org/10.3390/technologies6030078

Evaluation of Ion-Exchange Characteristics of Cesium in Natural Japanese Rocks

1
Graduate School of Science and Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan
2
Faculty of Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan
*
Author to whom correspondence should be addressed.
Received: 20 June 2018 / Revised: 9 August 2018 / Accepted: 10 August 2018 / Published: 17 August 2018
(This article belongs to the Special Issue Smart Systems)
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Abstract

A large amount of soil was contaminated by radioactive cesium due to the accident at the Fukushima Daiichi Nuclear Power Plant in Japan in 2011. The adsorption behavior of cesium ions (Cs+) is strongly influenced by numerous factors, including the components, structure and weathering conditions of natural soil. The adsorption and ion exchange characteristics of Cs+ ions onto and from natural Japanese rocks with well-known components were studied. Cs+ adsorption onto volcanic rocks (0.9–5.3 mg/g) occurred more easily than that onto plutonic rocks (0.7–0.8 mg/g) due to differences in crystallinity. In addition, the adsorption quantity of cesium increased with increasing lattice water content and content of ion-exchangeable cations in the rock samples. The cesium adsorption ability of rock was inhibited by seawater and coexisting ions in the solution. Cesium adsorption quantities onto andosol, containing the corrosion products, increased approximately 2.7-fold with increasing pH from neutral to basic. Cesium desorption differed depending on the type of salt used, and the desorption rates were highest with ammonium salts. Cs+ desorption from regions such as the soil interlayer and the pores were inhibited by melting of the rock surface. View Full-Text
Keywords: cesium; natural Japanese rocks; adsorption/desorption; heat treatment cesium; natural Japanese rocks; adsorption/desorption; heat treatment
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Miura, T.; Sasaki, A.; Endo, M. Evaluation of Ion-Exchange Characteristics of Cesium in Natural Japanese Rocks. Technologies 2018, 6, 78.

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