Abstract
The extraction behavior of Cu(II) from an aqueous nitrate medium employing β-hydroxy-naphthaldoxime in carbon tetrachloride has been investigated in the presence of several organophosphorus donors like tri-octyl phosphine oxide, tri-butyl phosphine oxide, and tri-butyl phosphate at pH 1.5. The concentration of the metal was measured by atomic absorption spectrophotometry. Synergism was observed when neutral donor was added because of the formation of the adduct [Cu(L)2.(S)] in CCl4 (S denotes neutral donor). The equilibrium constants of the binary system using β-hydroxy-naphthaldoxime and the ternary system involving another addition of an organophosphorus compound were calculated from the extraction date obtained. Furthermore, the temperature dependence of the equilibrium constants was also investigated to evaluate standard enthalpy (ΔH°), entropy (ΔS°), and free energy (ΔG°) of the reactions proposed.
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One of the authors, Pulak Dey, thanks CSIR, India for providing him the research fellowship.
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Manuscript submitted November 17, 2010.
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Dey, P., Basu, S. Synergistic Extraction of Copper from Nitrate Solutions Using β-Hydroxy-Naphthaldoxime and Organophosphorus Compounds into Carbon-Tetrachloride. Metall Mater Trans B 42, 1136–1143 (2011). https://doi.org/10.1007/s11663-011-9552-z
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DOI: https://doi.org/10.1007/s11663-011-9552-z