<報文>ゼオライトによる低レベル水溶液からの放射性コバルトの濃縮

概要

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Concentration of radioactive-cobalt by sodium-type zeolites has been studied in low-level aqueous solutions. The distribution of cobalt markedly depended on pH, and the presence of sodium ion (〜0.47M) had no effect on distribution behaviour. At trace-level concentrations, the distribution was characterized by curves having maxima at different pH (final pH, 7.0〜8.7) depending on the kinds of zeolites. The adsorption was governed by Langmuir-type isotherm, and hydrous cobalt ion was adsorbed into a large cage of zeolite structure. The adsorption of cobalt from artificial sea water was also studied, and the adsorption ratio was about 70% for A (Baylith), X (Baylith) and Y zeolites (32〜48mesh). The adsorption rate increased with decreasing particle size of these zeolites ; the adsorption ratio for zeolite X (Baylith, 65〜100mesh) reached 50% and 100% after 1hr and 24hr, respectively.
東北大学の論文
1984-09-25