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麻生 大貴*; 豊崎 綾香*; 浅沼 徳子*; 高畠 容子; 星野 貴紀; 渡部 創; 渡部 雅之; 松浦 治明*
no journal, ,
ウランとジルコニウムの各種ゼオライトへの吸着特性および化学的構造状態の違いを系統的に調査し、ウランとジルコニウムを分離する最適な条件を調査した。ジルコニウムの分配係数の値はウランのそれと比較して10以上小さいが、LZYのゼオライトの方が低pH下でゼオライトとしての特性を壊すことなく性能が維持され、相互分離に適することが明らかとなった。
松浦 治明*; 麻生 大貴*; 豊崎 綾香*; 浅沼 徳子*; 高畠 容子; 星野 貴紀; 渡部 創; 渡部 雅之
no journal, ,
Recovery of uranium from the waste solution is one of the important treatments of them. Various kinds of zeolites were selected for the separation of uranium and zirconium, and influence of chemical form of uranium and zirconium in zeolite on adsorption behavior were evaluated to find out an optimal condition for the effective U/Zr separation. Zeolites and zirconium nitrate solutions were shaken. Local structure of zirconium and uranium in adsorbed zeolites were evaluated by extended X-ray absorption fine structure using K and L3 absorption edge at BL27B, PF, KEK, respectively. By the comparison between distribution coefficients of zirconium and uranium, Kd, onto 13X and LZY type zeolites. 13X must be decomposed by solution with larger pH condition. Difference between local structures of zirconium and uranium in 13X was wider than that in LZY, therefore, this fact also supported above discussion. Thus, selective uranium adsorption can be achieved at this condition using LZY zeolite.