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KMID : 1059519870310040315
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Journal of the Korean Chemical Society
1987 Volume.31 No. 4 p.315 ~ p.321
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Synthesis and Use of a Ligand for the Extraction of Uranium (I)
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Pak Chong-Min
Choi Suk-Nam
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Abstract
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The ligand, 2,10-dibenzyl-4,6,8-trioxo-3,9-diaza undecane dioic acid(DTDA) for the extraction of uranium was synthesized under dry nitrogen from phenylalanine and 3-oxoglutaric acid. Extraction was performed by stirring a solution of DTDA in dichloromethane for 1 hour with an aqueous solution of UO2(ClO4)2·6H2O at various pH values and at different DTDA/UO22+ molar ratios. Extraction efficiency reaches a maximum when the pH of the aqueous phase was ca 8.0. The extraction percentage was affected by concentration of DTDA and increases with the DTDA/UO22+ molar ratio to complete extraction with a 4 fold excess of DTDA. The high selectivity of the DTDA for uranium was ascertained by competition experiments with other cations. The bound uranyl ion was quantitatively liberated within few minutes from the organic phase by treatment with an aqueous 1M HCI solution and DTDA was recovered very satisfactorily from the organic phase. The values of the over-all formation constants of the complex between uranyl ion and DTDA were determined to be the following : β1 = 1.20 × 105, β2 = 1.01 × 108.
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