Abstract
Solvent extraction of Co(II) from aqueous chloride solutions of constant ionic strength (I = 1 M) with a long-chain fatty acid, 2-heptyl-2-methylnonanoic acid (HA), in benzene was studied at four temperatures: 278, 288, 298, and 313 ± 1 K. The influence of various parameters on the extraction equilibrium was studied. The effect of mixing HA with TBP in benzene on the extraction process was examined, and a synergistic effect was revealed. The stoichiometry of the extraction equilibria was determined, and the thermodynamic studies were made for both extraction systems. The thermodynamic functions ΔG0, ΔH0, and ΔS0 were calculated, and the related data were discussed.
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