Novel Phosphoric and Phosphonic Acid Type Ion Exchange Resin for Separation of Rare Earth Metals

抄録

Novel phosphoric and phosphonic acid type ion exchange resins were synthesized as impregnation type resins and surface functional group type resins in the present work, and their adsorption and separation abilities for rare earth metals were investigated. The impregnation type resins were synthesized using 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester (PC-88A) as a porogen during the synthesis of polymer beads, while the surface functional group type resins were synthesized by immobilizing the phosphoric acid ester ligand onto polymer beads. All ion exchange resins exhibited adsorption ability for dysprosium. The separation abilities for dysprosium and europium with the impregnation type resins were consistent with those with the conventional solvent-impregnated resin containing PC-88A, while almost no selectivity was obtained with the surface functional group type resins. The impregnation type resin can be applied to column operation, and the selective adsorption of dysprosium over neodymium can be achieved by combining a scrubbing method.