Abstract
Abstract Macrocycle-facilitated transport of Pu(IV) against its concentration gradient from aqueous nitric acid solutions across an organic bulk liquid membrane (BLM) and a thin-sheet supported liquid membrane (SLM) containing dicyclohexano-18-crown-6 as the mobile carrier and toluene as the membrane solvent was investigated. Extremely dilute and moderately concentrated plutonium nitrate solutions in about 3 mol/dm3 nitric acid generally constituted the source phase. Plutonium transport appreciably increased with stirring of both the source and recovery phases and also with the carrier concentration in the organic phase up to 0.3 mol/dm3 DC18C6 and then decreasing with higher concentrations of the carrier. Enhanced acidity of the aqueous source phase beyond 4 mol/dm3 HNO3 seriously affected the stripping of the cation. Among the several reagents tested, dilute sodium carbonate (0.5 mol/dm3) served efficiently as the strippant. Enka Accurel thin flat-sheet polypropylene (PP) films were used as the solid su...
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