1993 年 30 巻 5 号 p. 436-443
Adsorption behavior of Cs and Sr on a synthetic zeolite P has been studied. Natural zeolites, clinoptilolite and mordenite, were converted into the zeolite P having a high crystallinity through hydrothermal treatment with NaOH solutions. The distribution coefficient (Kd) for Cs+ and Sr2+ depended on pH in acidic region, while attained nearly constant values around 103 cm3/g in neutral and alkaline regions. This value is almost the same as that for Cs+ and about ten times that for Sr2+ on the original clinoptilolite. The adsorption obeys Langmuir-type isotherms, and the saturated amounts of Cs and Sr were respectively estimated to be 1.76 and 1.84 mmol/g. The zeolite P containing these cations was readily converted into a stable solid form consisting of pollucite and Sr-feldspar by calcination above 1, 000°C.
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