Mixed-ligand chelate extraction of thorium(IV) and uranium(VI) with thenoyltrifluroacetone and various imidazoles

Reddy, M L P and Ramamohan, T R and Sahu, S K and Thakur, P and Chakravortty, V (2000) Mixed-ligand chelate extraction of thorium(IV) and uranium(VI) with thenoyltrifluroacetone and various imidazoles. Radiochimica Acta, 88 . pp. 405-410.

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Abstract

The synergistic extraction of thorium(IV) and uranium(VI) has been studied using mixtures of thenoyltrifluoroacetone (Htta) and various imidazoles such as imidazole(Imz), 2-methylimidazole (2-Meimz), benzimidazole (Bimz)or 2-pyridylbenzimidazole (2-Pybimz). The extraction data have been analysed by both graphical and theoretical methods by taking into account chemical mass action principles. The results demonstrate that these metal ions are extracted into chloroform as Th(tta)4 and UOzCtta)2with Htta alone and as Th(tta)4' nS and UOzCtta)z' nS in the presence of imidazoles (where n = 1 and 2 for thorium(IV) and n = 1 for uranium(VI); S represents imidazole). The equilibrium constants of the above extracted complexes have been deduced by non-linear regression analysis. The addition of an imidazole to the metal chelate system enhances the extraction efficiency of these metal ions. The complexation strength of these metal ions with various imidazoles follows the order: Imz > 2-Meirnz > Bimz > 2-Pybimz.

Item Type:Article
Official URL/DOI:http://eprints.nmlindia.org/5859
Uncontrolled Keywords:Solvent extraction, Uranium, Thorium, Thenoyltrifluoroacetone, Imidazoles
Divisions:Metal Extraction and Forming
ID Code:5859
Deposited By:Sahu Sushanta Kumar
Deposited On:30 Jul 2012 12:55
Last Modified:30 Jul 2012 12:55
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