Abstract
Abstract Extraction behavior of U(VI) from an HNO3 aqueous solution to 1-butyl-3-methylimidazolium nonafluorobutanesulfonate ([BMI][NfO]) ionic liquid and recovery of the extracted U(VI) by using H2O2 were investigated. With increasing [HNO3], the distribution ratio of U(VI) tends to decrease (e.g., 4.08 at [HNO3] = 0.01 M, 0.15 at [HNO3] = 1.00 M). Such extraction behavior is mainly governed by [H+], while coordination of NO3− to UO22+ also offers minor contribution to prevent partitioning of U(VI) to [BMI][NfO]. The U(VI) extraction in the current system is exclusively driven by NfO− to form an outer-sphere complex like {[UO2(OH2)5](NfO)4}2−. Addition of 30 wt % H2O2 to [BMI][NfO] containing U(VI) resulted in pale yellow precipitate of [(UO2)(O2)(H2O)2]·2H2O. The recovery efficiency increases with increasing pH of the aqueous layer, and reaches >90% at pH >1.5. This is in line with deprotonation from H2O2 through the precipitation of [(UO2)(O2)(H2O)2]·2H2O, i.e., UO22+ + H2O2 + 4H2O = [(UO2)(O2)(H2O)2]·2H2O (s) + 2H+.
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