Investigation on the Extraction and Separation of Ba(II), Sr(II) and Se(IV) from Aqueous Phase

Abstract

The ionic liquid thenoyltrifluoroacetone (TTA) and tri-iso-butyl phosphate (TBP) was used to extracted of Ba(II), Sr(II) and Se(IV). The effect of the variables that mostly affect the metal extraction process, namely extracting concentration, pH, shaking time and temperature was studied. As extraction measurement parameter, the metal extraction percentage (E%) and the metal distribution coefficient (D) were used. The equilibrium slope method was used in estimating the stoichiometry of the resulting organic complexes. The obtained plots are straight lines whose slopes are close to 2, which might be attributed to the extraction of a species of 2:1 (extractant /metal) stoichiometry. The free energy ΔG*, enthalpy ΔH* and entropy ΔS* were identified proving exothermic and spontaneous reaction of the present extraction process.