Study of specific Cs adsorption in layered clay minerals

2015 Fiscal Year Final Research Report

• Project/Area Number: 25400318
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Condensed matter physics I
• Research Institution: Tokyo Gakugei University
• Principal Investigator: Kiminori Sato 東京学芸大学, 教育学部, 准教授 (00401448)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: セシウム / 特異吸着 / 層状粘土鉱物 / ポジトロニウム

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.

Free Research Field

物性物理学