<報文>抽出剤内包型マイクロカプセルへの放射性核種の吸着特性

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The uptake properties of radioactive nuclides on microcapsules encapsulating DEHPA (di-(2-ethylhexyl)phosphoric acid) extractant have been studied by batch methods. The oil drops of DEHPA were uniformly encapsulated in the matrices of calcium alginate gel polymer. The micro-capsules exhibited relatively large distribution coefficients (K_d) above 10^3cm^3/g for trivalent metal ions (Y^<3+>, Eu^<3+>, Am^<3+> and Fe^<3+>). The uptake of Am^<3+> ions on microcapsules attained equilibrium within 1d, and high uptake perc entage above 99% was obtained. The uptake of Am^<3+> and Eu^<3+> ions depended on equilibrium pH, and the K_d values for microcapsules were larger than those for the gel matrices at lower pH region (<pH 2). The microcapsule irradiated at a dose of 188kGy was stable without noticeable structural damage yielding normal K_d values over 10^3cm^3/g for trivalent metal ions. The microcapsules containing extractants were thus useful for the simultaneous removal of trivalent metal ions from radioactive waste solutions.uptakeradioactive nuclidesmicrocapsuleencapsulationDEHPAalginategel polymerdistribution coefficientradiation resistance
東北大学の論文
2002-03-01