Influence of Solvent Properties on Their Efficiency As Liquid Membranes For Metal Ion Removal

International Journal of Applied Chemistry

© 2020 by SSRG - IJAC Journal

Volume 7 Issue 1

Year of Publication : 2020

Authors : Edita Bjelić, Mersiha Suljkanović, Jasmin Suljagić, Azra Kovačević

10.14445/23939133/IJAC-V7I1P102

How to Cite?

Edita Bjelić, Mersiha Suljkanović, Jasmin Suljagić, Azra Kovačević, "Influence of Solvent Properties on Their Efficiency As Liquid Membranes For Metal Ion Removal," SSRG International Journal of Applied Chemistry, vol. 7,  no. 1, pp. 6-9, 2020. Crossref, https://doi.org/10.14445/23939133/IJAC-V7I1P102

Abstract:

Among numerous experimental conditions for metal ion removal by the technique of bulk liquid membrane transport, effects of different membrane solvents were investigated. Polyether ligands dissolved within liquid membranes were used as electron donors for metal ions. The overall transport process (extraction, diffusion and re-extraction of analytes) depends on the numerous interactions within the membranes and on their surface.
In this paper, research was performed on ″model transport systems″, composed of: divalent metal ions (Cd, Pb) and counter ions (picrate) in ″source″ phase, polyethers (18-crown-6, benzo-18-crown-6, dibenzo-18-crown-6, Triton X-100) in different solvents (dichloromethane, 1,2-dichloroethane, chloroform and nitrobenzene) as ″membrane phase″ and stripping agents (thiosulfate) in ″receiving phase″. Spectrometric (UV/VIS and AAS) techniques were used for quantification of removed metal ions. Among the solvents used as liquid membranes, dichloromethane resulted with the highest efficiency for removal of metal ions with 18-crown-6 (61.26% for Cd and 70.40% for Pb), but also for other ligands. Higher dielectric constant (ε = 8.93) and lower viscosity (0,41) for dichloromethane contributed to higher removal rate, thus giving the advantage to this solvent for preparing the liquid membrane for transport of metal ions.

Keywords:

solvent parameters, liquid membrane transport

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