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A task-specific ionic liquid, protonated 1-carboxy- N , N , N -trimethylmethanaminium bis(trifluoromethylsulfonyl)imide trivially known as protonated betaine bis(trifluoromethylsulfonyl)-imide ([Hbet][NTf 2 ]) was prepared and the dissolution of uranium oxides, UO 3 , UO 2  and U 3 O 8  in it was studied. Dissolution of UO 3  in [Hbet][NTf 2 ] was very rapid and the saturation solubility of uranium was found to be 15 wt. % at 373 K. In contrast, dissolution of UO 2  was sluggish and it was facilitated only by the oxidation of UO 2  to UO 2  2+ . U 3 O 8  was insoluble up to 453 K. A new procedure was developed for the individual separation of uranium oxides using [Hbet][NTf 2 ] based on differences in solubilities. The electrochemical behavior of U(VI) in the resultant solution was investigated by cyclic voltammetry at glassy carbon working electrode at 373 K. A surge in the cathodic peak current at -0.48 V ( vs  . Fc/Fc + ) was due to the reduction of U(VI) to U(V) and the corresponding anodic peak current was observed at a potential of 0.64 V. Increasing the potential sweeping rate increases the peak current and shifts the peak potential negatively indicating the irreversible electroreduction of U(VI) in [Hbet][NTf 2 ]. The diffusion coefficient of U(VI) in [Hbet][NTf 2 ] was determined to be of the order of ∼10 −8  cm 2 /s.

Dissolution of uranium oxides and electrochemical behavior of U(VI) in task specific ionic liquid