Research Development of Novel Resins with Selectivity for Uranium(VI) and Clarification of Mechanism on Adsorption and Radiolysis

For novel selective separation and recovery of uranium which is necessary for utilization of atomic energy, research development was systematically carried out for monoamide resins aiming to selectively separate uranium(VI) species from acidic nitric acid solutions. Some synthetic resins were found to selectively separate U(VI) from other metal ions. It was also found that two kinds of adsorption sites contribute to the adsorption of monoamide resins to U(VI). For stability, resistance against heating of cyclic monoamide resins was found negligible for normal use. In addition, it was clarified that the route for radiolitic degradation by γ -ray is pronouncedly different between chain-type resins and cyclic-type ones.