Abstract
In this paper, the solvent extraction of zinc(II), cadmium(II) and chromium(III) from phosphoric acid solutions by tri- n butyl phosphate (TBP) in kerosene as diluent was investigated. The distribution coefficients were determined and the results showed clearly a maximum values at 5.5 mol/L H 3PO 4 concentration and a minimum values at 1.0 mol/L H 3PO 4 concentration. The apparent standard molar enthalpies Δ H° for extraction of zinc(II), cadmium(II) and chromium(III) were found to be, respectively, 51.11, 45.43 and 59.87 kJ/mol which indicate the endothermic nature of the extraction process. The apparent standard entropies Δ S° were also determined 1.685 × 10 −3, 1.377 × 10 −3 and 1.961 × 10 −3 kJ/mol K. The apparent standard Gibbs free energies Δ G° of extraction of zinc(II), cadmium(II) and chromium(III) were consequently calculated. Based on the regression analysis of the data, the equations for prediction of the distribution coefficients D of zinc(II), cadmium(II) and chromium(III), respectively were obtained.
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