Liquid-liquid extraction of dioxouranium(VI) with a mixture of 3-phenyl-4-benzoyl-5-isoxazolone and neutral oxodonors: A thermodynamic study

The thermodynamics of the synergistic solvent extraction of uranyl ion with 3-phenyl-4-benzoyl-5-isoxazolone(HPBI) and oxodonors viz. tri-n-butyl phosphate (TBP) and di-n-butyl octanamide (DBOA) was studied using radiochemical technique. It was observed from the extraction equilibria that the adduct formation process is of enthalpic as well as entropic origin for both the neutral oxodonors. An attempt was made to compare the thermodynamic parameters of the present extraction system with those of the UO22+-HTTA and UO22+-HPMBP systems. The effect of salt concentration in the aqueous phase on the extraction of the species UO2(PBI)(2) and UO2(PBI)(2) . S has also been studied at different temperatures.