The use of smectite-type clay minerals is proposed for capturing radioactive nuclear wastes from sea water. Iodine molecules dissolved in a 3 wt % aqueous NaCl solution were completely taken up by a column packed with Ag-modified synthetic saponite. Cs+ and Sr2+ ions in a 3 wt % aqueous NaCl solution were adsorbed efficiently on a column packed with magnesium vermiculite under appropriate conditions.
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Morimoto et al. (2011) studied this question.
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