Abstract
Carrier-facilitated transport of uranium(VI) against its concentration gradient from aqueous nitrate acidic solutions across an organic bulk liquid membrane (BLM) and flat-sheet supported liquid membranes (SLM) containing tributyl phosphate (TBP) as the mobile carrier and dodecane as the membrane solvent has been investigated. Extremely dilute to moderately concentrated uranyl nitrate solutions (ca. 10 −4 M) in 2 M HNO 3 generally constituted the source phase. With increasing carrier concentration in the organic membrane, both the amount of uranium that could be extracted into the membrane and the viscosity of the organic solution increased. These opposing effects resulted in maximum uranium permeation at ca.30% TBP in dodecane, while enhanced acidity of the strip side adversely affected the partitioning of the cation into the receiving phase. Among the several aqueous reagents tested, dilute ammonium carbonate (ca. 1 M) solution was the most efficient strippant. The stoichiometry of the urnium—TPB complex in this liquid membrane system was established to be UO 2(NO 3) 2·2TBP, which is in accord with that deduced on the basis of liquid—liquid distribution measurements.
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