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- Title
Solid phase extractive preconcentration of some actinide elements using impregnated carbon.
- Authors
Someda, H. H.; Sheha, R. R.
- Abstract
Apricot stone shells were carbonized under certain chemical and thermal conditions, and the resulting charcoal was impregnated with oxalic and succinic acids of different concentrations. The sorbents were physically characterized and used for preconcentration of U(VI) and Th(IV) from acidified aqueous solutions. Batch equilibrium studies revealed that a quantitative preconcentration could be achieved at pH ∼2 for U(VI) and ∼1.3 for Th(IV). The equilibration time was up to 24 h for U(VI) and 40 min for Th(IV). The modified sorbent showed a superior extraction ability for U(VI) and Th(IV) with the mean distribution coefficients ( K d) of 2084 and 7808 ml g−1, respectively. The sorption capacity was found to be 2.39 and 8.47 mg g−1 for U(VI) and Th(IV) on apricot stone anchored with oxalic acid and 2.3 and 9.18 mg g−1 for the sorbent anchored with succinic acid, respectively. Desorption of the loaded uranium ions was effectively achieved using 1 M HNO3, whereas only 0.5 M HNO3 was recommended to release the retained thorium ions.
- Subjects
ACTINIDE elements; SUCCINIC acid; CHARCOAL; OXALIC acid; IONS
- Publication
Radiochemistry, 2008, Vol 50, Issue 1, p56
- ISSN
1066-3622
- Publication type
Article
- DOI
10.1134/S1066362208010086