Adsorption of cesium by Japanese acid clay

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<jats:title>Abstract</jats:title> <jats:p>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.</jats:p> <jats:p>The Kd value of cesium was highest in pure water, but it was decreased by increasing the aqueous acid, alkali and salt concentration.</jats:p> <jats:p>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.</jats:p> <jats:p>The adsorption of cesium from a fission products mixture was also simply examined.</jats:p>

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