Solvent Extraction and Ion Exchange · 2006 · 30 citations · 6 references
Natural SciencesChemistryAnalytical ChemistryInorganic ChemistryOrganic ChemistryCalixarene ChemistryExtraction TechniquesSolvent ExtractionCalixarene-based ExtractantsExtraction Of Organic CompoundsExtraction SolventsPh DependencePh-dependent ExtractionSelective Solvent ExtractionSolvent Extraction Chemistry
Abstract This paper focuses on the solvent extraction of U(VI) traces by 1,3,5‐OMe‐2,4,6‐OCH2CONHOH‐p‐tert‐butylcalix[6]arene (LH3). The global extraction equation of U(VI) has been established. The complex formed in the organic phase is (UO2)(LH) with an apparent extraction constant equal to 7.1×10−5 M (I=0.04 M). Distribution data show that LH3 efficiently extracts U(VI) from NaNO3 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‐OCH2COOH‐p‐tert‐butylcalix[6]arene (L′H3) shows that the hydroxamate groups are as efficient as the carboxylate ones for uranyl extraction.
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