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A decrease in the desorption rate of Cs+ from natural sediment was observed with increasing Cs+ sorption time. This aging effect poses a serious issue as it hinders the removal of radioactive cesium ions from natural sediments. In this study, adsorption and desorption experiments and molecular simulations were conducted on artificially weathered hydroxy-Al-interlayered clay minerals to elucidate the mechanism underlying this aging effect. The proposed aging mechanism of Cs+ in hydroxy-Al-interlayered clay minerals involves two steps: (1) Cs+ penetrates the interlayer space, which is expanded by the presence of hydroxy-Al segments, and (2a) it gradually migrates into the collapsed zone or (2b) into the inner hydroxy-Al layers. The structure of the (2b) model can explain the presence of five-fold coordination of Al, and the stability of Cs+ in the hydroxy-Al sheets was evaluated using density functional theory calculations.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Cesium, phlogopite, vermiculite, NMR, molecular dynamics, DFT

Date published: 2026-03-03

Publisher: American Chemical Society (ACS)

Journal:

• LANGMUIR (ISSN: 15205827) vol. 42 issue. 8 p. 6081-6090

Funding:

• Japan Society for the Promotion of Science JP22K05204
• Environmental Restoration and Conservation Agency JPMEERF20191006

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1021/acs.langmuir.5c05291

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Updated at: 2026-03-05 16:30:12 +0900

Published on MDR: 2026-03-05 13:42:52 +0900