Sorption of Th, U, and Am on phosphorus-containing ion-exchange materials

• Published in: Radiochemistry (New York, N.Y.) N.Y.), 2010-02, Vol.52 (1), p.71-75
• Main Authors: Nekrasova, N. A., Gelis, V. M., Milyutin, V. V., Budantseva, N. A., Kozlitin, E. A., Logunov, M. V., Pristinskii, Yu. E.
• Format: Article
• Language: English
• Subjects: Chemistry; Chemistry and Materials Science; Chemistry/Food Science; Nuclear Chemistry
• ISSN: 1066-3622; 1608-3288
• DOI: 10.1134/S1066362210010169

Sorption of Th, uranyl, Am, Fe, and Al ions from nitric acid solutions on various phosphorus-containing ion-exchange materials (organic ion-exchange resins, SE-UPO solid extractant) was studied. The highest selectivity to quadruple-charged metal cations is exhibited by S-957 cation exchanger (Purolite) with phosphonic and sulfonic acid groups. The capacity of this resin for Th is essentially independent of the HNO 3 concentration in the range 1–7 M and amounts to 80–95 mg ml −1 . The uranyl, Am, Fe, and Al ions are sorbed on S-957 resin considerably worse than Th. The internal diffusion coefficient of Th 4+ ions in S-957 resin from 3 M HNO 3 was determined to be (5.3 ± 0.5) × 10 −13 m 2 s −1 . The IR spectra of S-957 resin in the hydrogen and thorium forms were recorded. S-957 resin shows promise for selective recovery of tetravalent actinides from multicomponent nitric acid-salt solutions.