Studies of the aromatic β-diketones as extractant of copper ions

Katarzyna Witt,Elzbieta Radzyminska-Lenarcik,A Chmielarz,A Wieniewski

doi:10.1051/e3sconf/20171801016

Katarzyna Witt, Elzbieta Radzyminska-Lenarcik + Show 2 more

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https://doi.org/10.1051/e3sconf/20171801016

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Abstract

Benzoylacetone 2, dibenzoylmethane 3and acetylacetone 1were studied as extractants of copper ions by liquid-liquid partition and spectrophotometric methods. Extraction ability increase in order 1< 2< 3. The values of pH1/2, corresponding to 50% of the extraction of copper, are equal to 10.75, 10.08 and 9.85 for 1, 2, 3, respectively. The extraction process is the most effective when 3was used as extractant, the maximum amount of copper ions passed to the organic phase is 50% and 99% for 1and 3, respectively. The spectra have shown that in the aqueous and in the organic phase β-diketone form two chelated complexes [CuL]+ and [CuL2]. Partition ratios (P2) of [CuL2] complexes have very high values, much higher than P1. That complexes determine the efficiency of extraction process of Cu(II) ions, what confirm the electron absorption spectra.

Highlights

Hydrometallurgy is concerned with aqueous solutions, and metal ions are the species of interest
Extraction of metal ions directly into a water-immiscible oil phase is energetically unfavorable, and this process can only be accomplished by arranging that the metal ion be transferred to the organic phase as a neutral species
Copper is presented in a number of effluents or waste waters of various nature, being its elimination a primary target from an environmental point of view, with solvent extraction and membrane technologies gaining an important role in this approach [3]

Summary

Introduction

Hydrometallurgy is concerned with aqueous solutions, and metal ions are the species of interest. Extraction of metal ions directly into a water-immiscible oil phase is energetically unfavorable, and this process can only be accomplished by arranging that the metal ion be transferred to the organic phase as a neutral species. Such species can be produced by aqueous complexing or by association with anions whereby, by careful choice of ligand concentration, a neutral species extractable by an organic solvent can be produced [1,2]. The most known β-diketone extractants are the commercial compounds of the LIX group. Authors proved that nickel extraction is very sensitive to equilibrium pH and the extraction decreases beyond pH 9.0

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