What is it about?
The permeation rate of Co(II) and Li(I) from a dilute aqueous sulfate media using supported liquid membrane (SLM) technique has been studied. The microporous hydrophobic PVDF film was used as the solid support for the liquid membrane and Cyanex 272 was used as mobile carrier. The liquid-liquid extraction of Co(II) and Li(I) using Cyanex 272 in sulfate media was studied and compared with supported liquid membrane results. Effect of different parameters such as speed of rotation, pH in feed solution, Cyanex 272 concentration in membrane phase, Co(II) and Li(I) concentration in feed solution and strip acid concentration on Co(II) flux JCo(II) and Li(I) flux JLi(I) has been studied. The Co(II) flux increased with increasing of pH from 4.00 to 6.00 and then decreased with further increase of pH up to 6.75. The Co(II) flux JCo(II) was also increased with increase of Cyanex 272 concentration in membrane phase up to 750 mol/m3 then decreased. The flux for Li(I) was remained constant. The separation factors for Co(II) and Li(I) were calculated at different experimental condition and were reported. At suitable optimum condition of pH 6.00, Cyanex 272 concentration in membrane phase of 750 mol/m3, strip acid concentration of 25 mol/m3 and stirring speed of 350 rpm, the flux for Co(II) JCo(II) was 82.20 x 10-6 mol/m2.s and the flux for Li(I) JLi(I) was 0.918 x 10-6 mol/m2.s..
Featured Image
Why is it important?
The permeation rate of Co(II) and Li(I) from a dilute aqueous sulfate media using supported liquid membrane (SLM) technique has been studied. The microporous hydrophobic PVDF film was used as the solid support for the liquid membrane and Cyanex 272 was used as mobile carrier. The liquid-liquid extraction of Co(II) and Li(I) using Cyanex 272 in sulfate media was studied and compared with supported liquid membrane results. Effect of different parameters such as speed of rotation, pH in feed solution, Cyanex 272 concentration in membrane phase, Co(II) and Li(I) concentration in feed solution and strip acid concentration on Co(II) flux JCo(II) and Li(I) flux JLi(I) has been studied. The Co(II) flux increased with increasing of pH from 4.00 to 6.00 and then decreased with further increase of pH up to 6.75. The Co(II) flux JCo(II) was also increased with increase of Cyanex 272 concentration in membrane phase up to 750 mol/m3 then decreased. The flux for Li(I) was remained constant. The separation factors for Co(II) and Li(I) were calculated at different experimental condition and were reported. At suitable optimum condition of pH 6.00, Cyanex 272 concentration in membrane phase of 750 mol/m3, strip acid concentration of 25 mol/m3 and stirring speed of 350 rpm, the flux for Co(II) JCo(II) was 82.20 x 10-6 mol/m2.s and the flux for Li(I) JLi(I) was 0.918 x 10-6 mol/m2.s..
Perspectives
The studies for separation of Co(II) and Li(I) was carried out by liquid membrane technique using Cyanex 272 extractant as mobile carrier. Also equilibrium studies with shake flask were studied and compared. Following conclusions were drawn from the above studies. (1) The slope analysis studies of log D vs. equilibrium pH and log D vs. log [Cyanex 272] indicates that 1 mole of the hydrogen ion and 2 moles of extractants were involved with 1 mole of the extracted metal species of Co(II). (2) The Co(II) flux increased with increase of pH from 4.00 to 6.00 and Li(I) flux remains constant over all the pH range. The extraction of Co(II) below pH 3.0 was not possible. (3) Also JCo(II) increased with increase of extractant concentration up to 750 mol/m3 and then decreased. (4) The best separation factor of 180 for Co(II) and Li(I) was obtained at feed pH of 6.00, 750 mol/m3 of Cyanex 272 and 100 mol/m3 of H2SO4 in strip solution. (5) In general quantitative separation of Co(II) from Li(I) is possible by SLM process using Cyanex 272 as mobile carrier, eliminating the higher solvent inventory, scrubbing difficulties and multistage extraction difficulties.
Dr Basudev Swain
Institute for Advanced Engineering (IAE)
Read the Original
This page is a summary of: Separation of Co(II) and Li(I) by supported liquid membrane using Cyanex 272 as mobile carrier, Journal of Membrane Science, July 2007, Elsevier,
DOI: 10.1016/j.memsci.2007.03.051.
You can read the full text:
Contributors
The following have contributed to this page
