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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 31, Number 4
JKCSEZ 31(4)
August 20, 1987 

Synthesis and Use of a Ligand for the Extraction of Uranium (Ⅰ)

우라늄 추출을 위한 리간드의 합성 및 응용 (제 1 보)
Chong Min Park, Suk Nam Choi

박종민, 최석남
우라늄 추출을 위한 리간드를 페닐알라닌과 3-oxoglutaric acid로 부터 합성하였다. 여러가지 pH, 리간드와 우라늄의 여러 농도비에서 리간드를 녹인 이염화메탄 용액을 사용하여 우라늄 추출 실험을 한 결과, pH 8에서 최대의 추출효율이 나타났으며, 리간드와 우라늄의 농도비가 커질수록 추출율이 증가하였고, 농도비가 4이상에서 완전추출이 되었다. 또한 다른 양이온들과의 경쟁반응에서 리간드가 우라늄에 대해 높은 선택성을 나타내는 것이 확인 되었으며, 추출된 우라늄이 1M 염산용액에 정량적으로 회수되었고 리간드도 재사용 할 수 있었다. 그리고 우라닐 이온과 리간드의 안정도 상수를 측정 하였으며, 총괄 생성상수 값들은 다음과 같다. β1 = 1.20 × 105, β2 = 1.01 × 108

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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