Adsorption of Cesium by Japanese Acid Clay

概要

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Japanese acid clay, a montmorillonite-type one, exhibited a special affinity for cesium-137 from an aqueous solution. The phase epuilibrium of the adsorption was confirmed, and the Kd values were used to analyze the data. The Kd value of cesium was highest in pure water, but it was decreased by increasing the aqueous acid, alkali and salt concentration. When clay which had been treated at 400∼ 500°C was used, the Kd value increased two- or three-fold. This phenomenon corresponds to the formation of 10 Å c-axis spacing and the dispersion of the structural water of the clay. This peculiarity, however, appears only at a low cesium concenration, below 10－6 mol./l. At a higher cesium concentration, the adsorption of cesium depends simply on the cation exchange capacity of the clay; heat-treated clay showed a poorer adsorption. The adsorption of cesium from a fission products mixture was also simply examined.
社団法人日本化学会の論文