Abstract
The synergistic solvent extraction of La(III), Nd(III), Eu(III), Ho(III), and Lu(III) with a chelating extractant 4-benzoyl-3-phenyl-5-isoxazolone (HPBI) or 2-thenoyltrifluoroacetone (HTTA) and neutral bidentate heterocyclic amines, such as 1,10-phenanthroline (phen) or 2,2′-bipyridine (bipy), in CHCl3 was investigated. Synergism was found to be due to formation of the ternary complex, Ln(PBI)3·S or Ln(TTA)3·S, in the organic phase, where S denotes a neutral ligand. On the basis of the experimental data, the values of the equilibrium constants were calculated. The parameters of the extraction process were determined. The influence of the synergistic agent on the extraction process is discussed. The synergistic and separation factors were determined.
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