Abstract

This article concerns the experimental study in separating Cr(VI) using an emulsion membrane made with trioctylamine (TOA), secondary capryl alcohol (SCA) and tributyl phosphate (TBP) as the mixed carrier, Span- 80 and Lan-113 blend as the surfactant and kerosene as the membrane solvent. We have optimized the blend of carrier and surfactant and determined the operating conditions, such as Roi (ratio of oil membrane volume/ internal phase) and Rew (Ratio membrane emulsion volume/feed volume), pH of the internal and external phases, the rotation speed and time of emulsion preparation, and the mixing rotation speed (mixing emulsion/ wastewater), all of which have some effect on the removal rate of Cr(VI). The experimental results show that trioctylamine, secondary capryl alcohol and tributyl phosphate (as the mixed carrier) and Span-80 as surfactant make an emulsion membrane which has improved separating enrichment /properties for Cr(VI). The removal rate of Cr(VI) can reach 99.84%.