Abstract
For successful 137Cs decontamination from the soil environment, Cs adsorption sites for a saponite (i.e., a silicate clay of highly complex soil material) are highlighted based on the results of Fourier transform infrared (FT-IR) spectroscopy, 133Cs magic-angle-spinning nuclear magnetic resonance (MAS NMR), radiocesium interception potential (RIP), and a conventional elution experiment. Heavily adhesive Cs adsorption was found to originate from Cs chemisorption at nanosheet edges and Cs confinement in wedge-shaped parts available in the interior of local molecular structures, in which one- and two-nanosheets are inserted into the interlayer spaces. The multidisciplinary approach covering physical, chemical, and geochemical techniques successfully determines the concentrations of Cs-adsorption-associated nanosheet surfaces, nanosheet edges, wedge-shaped parts, and oncoming hexagonal cavities to be 322, 238, 9 × 10–2, and 207 mmol kg–1, respectively. Radioactive 137Cs that is not cleaned up after decontamin...
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