Abstract
The extraction/complexation of uranyl ion by structurally modified sulphoxides in ionic liquid was investigated. These systems were found to be highly efficient, selective and radiolytically stable for hexavalent f-block elements. The extraction proceeds via ‘cation exchange’ mechanism through the species, [U(NO3)·2L]+. Processes were found to be kinetically slow, thermodynamically spontaneous and proceeded via single species. The extended resonance and steric crowding favoured the complexation of phenyl sulphoxides. Na2CO3 was found to be suitable for the quantitative back extraction of uranyl ion from the ionic liquid phase. Finally, these systems were employed for the processing radioactive waste.
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