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Diffusion and retention behaviour of Cs in illite-added compacted montmorillonite

Published online by Cambridge University Press:  02 January 2018

Takamitsu Ishidera ,
Seiichi Kurosawa ,
Masanori Hayashi ,
Keiji Uchikoshi  and
Hikari Beppu
Takamitsu Ishidera*
Affiliation:
Japan Atomic Energy Agency (JAEA), 4-33, Muramatsu, Tokai-mura, Naka-gun, Ibaraki, 319-1194, Japan
Seiichi Kurosawa
Affiliation:
Inspection Development Corporation, 4-33, Muramatsu, Tokai-mura, Naka-gun, Ibaraki, 319-1112, Japan
Masanori Hayashi
Affiliation:
Inspection Development Corporation, 4-33, Muramatsu, Tokai-mura, Naka-gun, Ibaraki, 319-1112, Japan
Keiji Uchikoshi
Affiliation:
Inspection Development Corporation, 4-33, Muramatsu, Tokai-mura, Naka-gun, Ibaraki, 319-1112, Japan
Hikari Beppu
Affiliation:
Inspection Development Corporation, 4-33, Muramatsu, Tokai-mura, Naka-gun, Ibaraki, 319-1112, Japan
*
*E-mail: ishidera.takamitsu@jaea.go.jp
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Abstract

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Compacted bentonite is to be used as a component of an engineered barrier system to retard the migration of radionuclides in the geological disposal of radioactive waste. In such an environment, montmorillonite in compacted bentonite might be altered to illite due to the hydrothermal reactions caused by the decay heat of radionuclides. In the present study, the diffusion and retention behaviour of Cs in compacted montmorillonite containing illitewas investigated using through-diffusion experiments. The experimental results showed that the flux of Cs attributed to the surface diffusion was independent of the sorption of Cs on illite, indicating that the Cs sorbed on illite was immobile or considerably less mobile than the Cs sorbed on montmorillonite. Consequently, the illite content in compacted bentonite is expected to enhance the sorption capacity of Cs without causing surface diffusion.

Keywords

radioactive wastegeological disposalcompacted bentonitemontmorilloniteillitecesiumsorptionsurface diffusion
Type
Research Article
Information
Clay Minerals , Volume 51 , Issue 2 , May 2016 , pp. 161 - 172
Creative Commons
Creative Common License - CCCreative Common License - BY
Copyright © The Mineralogical Society of Great Britain and Ireland 2016 This is an Open Access article, distributed under the terms of the Creative Commons Attribution license. (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2016

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