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

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.