Solvent Extraction of U(VI) by Calix[6]arenes

This paper focuses on the solvent extraction of U(VI) traces by 1,3,5-OMe-2,4,6-OCH 2 CONHOH-p-tert-butylcalix[6]arene (LH 3 ). The global extraction equation of U(VI) has been established. The complex formed in the organic phase is (UO 2 )(LH) with an apparent extraction constant equal to 7.1×10 −5...

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Bibliographic Details
Published in:Solvent extraction and ion exchange 2006-07, Vol.24 (3), p.319-330
Main Authors: Boulet, B., Bouvier-Capely, C., Cossonnet, C., Cote, G.
Format: Article
Language:English
Subjects:
calixarene
carboxylic
hydroxamic
Solvent extraction
uranium
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Summary:This paper focuses on the solvent extraction of U(VI) traces by 1,3,5-OMe-2,4,6-OCH 2 CONHOH-p-tert-butylcalix[6]arene (LH 3 ). The global extraction equation of U(VI) has been established. The complex formed in the organic phase is (UO 2 )(LH) with an apparent extraction constant equal to 7.1×10 −5 M (I=0.04 M). Distribution data show that LH 3 efficiently extracts U(VI) from NaNO 3 media at pH 5 and that the stripping of U(VI) can be achieved in nitric acid solutions. Finally a comparison with previous results obtained with the 1,3,5-OMe-2,4,6-OCH 2 COOH-p-tert-butylcalix[6]arene (L′H 3 ) shows that the hydroxamate groups are as efficient as the carboxylate ones for uranyl extraction.
ISSN:0736-6299
1532-2262
DOI:10.1080/07366290600646939