Mechanism of Strong Affinity of Clay Minerals to Radioactive Cesium: First-Principles Calculation Study for Adsorption of Cesium at Frayed Edge Sites in Muscovite
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概要
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The present first-principles study based on density-functional theory confirms that frayed edge sites (FESs) formed in micaceous clays have a crucial role in the long-term stability of radioisotopes of Cs on the topsoil surface. An FES is modeled according to the weathering scenario of muscovite, and the substitution of originally occupied K with Cs is virtually simulated. The calculation results clearly demonstrate that such a replacement is strongly promoted only when the stack structure is loosely expanded at the clay edges. This is the first atomic-scale confirmation of the strong affinity of FESs to Cs, which may shed new light on the decontamination engineering of soil materials.
- 2013-03-15
著者
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Okumura Masahiko
CCSE, Japan Atomic Energy Agency
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NAKAMURA Hiroki
CCSE, Japan Atomic Energy Agency
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MACHIDA Masahiko
CCSE, JAERI
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Machida Masahiko
CCSE, Japan Atomic Energy Agency, Kashiwa, Chiba 277-8587, Japan
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Okumura Masahiko
CCSE, Japan Atomic Energy Agency, Kashiwa, Chiba 277-8587, Japan
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