EFFICIENCY OF SODIUM DODECYL BENZEN SULFONATE IN REMOVAL OF PB(II) IONS TROUGH BULK LIQUID MEMBRANE SYSTEMS

Abstract

In this paper, the influence of the anionic surfactant, sodium dodecyl benzene sulfonate (SDBS) on the efficiency of Pb(II) ions removal through a bulk liquid membrane system, were investigated. Different organic solvents were used as liquid membranes: dichloromethane and chloroform. Macrocyclic ligands: 18 crown-6, dibenzo-18-crown-6, dicyclohexano-18-crown-6, and benzo-18-crown-6 dissolved in organic solvents were used as carriers for Pb(II) ions. Metal ions concentration in aqueous phases was monitored by flame atomic absorption spectrophotometry, after 3 hours of membrane transport. The results showed that the presence of the anionic surfactant SDBS in the receiving phase reduces the content of Pb(II) ions in the source phase and increases the transport rate removed Pb(II) ions to the receiving phase. Among the applied solvents, the highest efficiency in the role of liquid membrane showed dichloromethane, for all applied macrocyclic ligands. From the aspect of the used macrocycle, the addition of an anionic surfactant in the receiving phase with dichloromethane reflected in an increased amount of removed Pb(II) ions from the source phase, following the order: 18C6>B18C6>DCH18C6>DB18C6. Chloroform as a liquid membrane reflected also in an increased amount of removed Pb(II) ions from the source phase, following the order: 18C6>DB18C6>DCH18C6>B18C6.            18-crown-6 (18C6) compared to other ligands proved tobe a selective and efficient carrier for the transport of Pb(II) ions via BLM, removing 71% of transported Pb (II) ions from the source phase through dichloromethane while chloroform slightly lower transport rate (63.4%) was achieved for the same used macrocycle.