Abstract
The solvent extraction of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu from weak acidic chloride solutions into an organic phase containing 4-benzoyl-3-methyl-1-phenyl-5-pyrazolone (HP) and phosphoryl-containing podands (L) has been studied. A considerable synergistic effect was observed in the presence of neutral ligands L in the organic phase containing HP. The stoichiometry of the Ln(III) extracted species was determined by slope analysis and the equilibrium constants were calculated. It was found that the lanthanide(III) ions are extracted with mixtures of HP and neutral ligands in toluene from weak acidic solutions as LnLP3 complexes.
Highlights
Solvent extraction is a widely used technique for the separation and preconcentration of lanthanide(III) ions
We study the effect of structure of phosphoryl-containing podands I-VII on the extraction of Ln(III) ions with 4-benzoyl-3-methyl-1-phenyl-2-pyrazolin-5-one (HP) in organic diluents and determine the composition of the extracted complexes of Ln(III)
The lanthanides(III) extraction with 4-benzoyl-3-methyl-1-phenyl-5-pyrazolone (HP) alone in organic diluents was previously studied by Dukov et al.[38,39]
Summary
Solvent extraction is a widely used technique for the separation and preconcentration of lanthanide(III) ions. During the last few decades, the synergistic extraction of lanthanides(III) with mixtures of acidic chelating extractants such as β-diketones, 4-acylpyrazolones, 4-acyl-5-izoxazolone, etc. Arenes as a synergistic agent at the Ln(III) extraction with various acidic chelating extractants of β-diketone type.[21,22,23,24,25,26] The introduction of P(O) functional groups in the calixarene architecture leads to a significant increase in the extraction efficiency.[26] The addition of phosphorus-containing calix[6]arene to the chelating extractant, 4-benzoyl-3-. We study the effect of structure of phosphoryl-containing podands I-VII on the extraction of Ln(III) ions with 4-benzoyl-3-methyl-1-phenyl-2-pyrazolin-5-one (HP) in organic diluents and determine the composition of the extracted complexes of Ln(III). The reaction mixture was poured into water, extracted by benzene (4 × 30 mL), the organic extracts were rinsed with 20% HCl solution (3 × 30 mL), water (3 × 30 mL), dried by
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