A New Granular Composite with High Selectivity for Cesium Ion Prepared from Phosphomolybdic Acid Hydrate and Inorganic Porous Material

Ammonium molybdophosphate (AMP) was incorporated in the porous alumina matrix (JA) by successive impregnation with H3Mo12O40P and NH4NO3. The loading percentage of AMP crystals on JA increased with the repetition times of impregnation. The distribution coefficients of Cs+ on AMP-loaded granular composite (JAAMP) was above 104 cm3/g in the presence of 1 mol/dm3 while those of other nuclides were less than 10, indicating high selectivity of JAAMP to Cs+. The separation factor of 137Cs to other nuclides 85Sr,60Co, 152Eu,241Am,22Na) (αCs/Sr;Co;Eu;Am;Na =K d,Cs/K d,Sr;Co;Eu;Am;Na) was estimated to be above 103. The breakthrough curve for Cs+ through the column packed with JAAMP exhibited a symmetrical S-shaped profile, and this exchanger proved to be effective for the selective isolation of radiocesium from a simulated high-level liquid waste.