<報文>不溶性フェロシアン化物-アルギネート複合体によるパラジウムの選択的分離

概要

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The uptake properties of Pd on insoluble ferrocyanide-alginate composites have been studied by the batch and column methods. The precipitated powder of insoluble copper ferrocyanide (CuFC) was uniformly immobilized in the calcium alginate polymer gels. The uptake of Pd on the composites of CuFC-Ca alginate (CuFC-ALG) attained equilibrium within 7d, and high uptake percentage of Pd above 97% was obtained independent of the concentration of coexisting nitric acid. The CuFC-ALG composites exhibited relatively large values of separation factor of 178 and 72.8 for Pd/Rh and Pd/Ru, respectively. The uptake isotherm of Pd followed a Langmuir-type adsorption equation and the maximum adsorption capacity was estimated to be 0.46mmol/g. The chemical species of Pd adsorbed were determined to be Pd^0 and Pd^<2+> by XPS analysis. These findings suggest that the ion exchange and oxidation-reduction reaction took part in the uptake of Pd. The selective uptake of Pd from simulated high-level radioactive waste solution was accomplished by using CuFC-ALG composites, and the successive separation of Pd was attained through the packed column.insoluble copper ferrocyanidesalginatecompositeuptakepalladiumpolymer gelseparation factorion exchangeoxidation-reductionhigh-level liquid wastepacked column
東北大学の論文
2001-03-01