| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2014: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2013: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
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| Outline of Final Research Achievements |
In the present work, specific Cs adsorption is studied for the layered clay minerals by means of positronium annihilation spectroscopy. A population of Cs was found to be able to adsorb on the surfaces of open nanospaces with their sizes of ~ 0.3 nm and ~ 0.9 nm, which are formed by one- and two-clay nanosheet insertion into interlayer spaces. They are adsorbed on the surfaces of both the open nanospaces so strongly that cannot be removed by the hydrochloric acid solution of pH 1.0, these open nanospaces thus acting as the specific Cs adsorption site. The characteristic local molecular structures as a nanosheet edge and a wedge-shaped frayed part available in the open nanospaces could be responsible for the specific Cs adsorption.
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