Etude Thermodynamique de L’extraction des Metaux de Transition par la Salicylideneanili.

Abstract

Solvent extraction of copper(II), cobalt(II) and nickel(II) from sulfate medium with salicylideneaniline is studied with the following parameters: pH, concentration of the extractant, nature of diluent, and temperature. The stoichiometry coefficients of the extracted complexes and their extraction constants were dependent on the nature of the diluents. The extraction is better in the following order: Cyclohexane > toluene > chloroform. The temperature effect on the solvent extraction of copper(II) cobalt(II) and nickel(II) with salicylideneaniline in cyclohexane is discussed. Temperature dependency: the extraction increases with increasing temperature. The equilibrium constants have been calculated as well as thermodynamic parameters extraction enthalpy, extraction entropy and free energy