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. 2023 Aug 13;47(6):1355-1369.
doi: 10.55730/1300-0527.3619. eCollection 2023.

Extraction/transportation of Co2+ metal ions with bis(2-ethylhexyl) phosphate dissolved in kerosene using a multidropped liquid membrane technique

Volkan Demirel  1 , Ramazan Donat  1
Affiliations

Extraction/transportation of Co2+ metal ions with bis(2-ethylhexyl) phosphate dissolved in kerosene using a multidropped liquid membrane technique

Volkan Demirel et al. Turk J Chem. .

Abstract

The transport properties of Co2+ ions from the aqueous donor phase to aqueous acceptor phase with the recently developed multidroplet liquid membrane (MDLM) extraction system were studied. This system serves as a continuous process for the transportation of ions and requires fewer reagents for starting and conducting the procedure. Moreover, the procedure results in fewer waste chemicals and mixtures in comparison to traditional extraction methods. During extraction, bis(2-ethylhexyl) phosphate (D2EHPA) was used as a carrier material and 5% potassium thiocyanate (KSCN) solution was used to obtain a colored complex for UV-Vis detection. By means of several experiments, the optimum D2EHPA concentration, pH range for both donor and acceptor phases, and temperature range effect on transport kinetics were investigated. In the extraction of cobalt ions with the MDLM system, the activation energy was calculated as Ea = 13.80 kcal mol-1, and it was found that the extraction was chemically controlled since it was greater than 10 kcal mol-1.

Keywords: Cobalt; D2EHPA; membrane; multidroplet liquid membrane system; transport.

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Conflict of interest statement

Conflict of interest: The authors declare no competing interests.

Figures

Figure 1
Figure 1
Measurement set schematic for flowing MDLM system.
Figure 2
Figure 2
Chemical structure of D2EHPA.
Figure 3
Figure 3
D2EHPA dimer structure in nonpolar kerosene.
Figure 4
Figure 4
Cobalt ion complex formed by D2EHPA.
Figure 5
Figure 5
The process by which an uncharged compound between Co2+ and D2EHPA forms.
Figure 6
Figure 6
Concentrations of Co2+ ions versus time graphs for MDLM extraction studies of (a) donor, (b) acceptor, and (c) organic phase at different concentrations of carrier agent D2EHPA in kerosene (0.015–0.061 mol L−1).
Figure 7
Figure 7
ln (Co/Ce) versus time graphs for Co2+ ion MDLM extraction studies at different concentrations of carrier agent D2EHPA in kerosene (0.015–0.061 mol L−1).
Figure 8
Figure 8
Concentrations of Co2+ ions versus time graphs for MDLM extraction studies of (a) donor, (b) acceptor, and (c) organic phase at different temperatures (293.15–308.15 K).
Figure 9
Figure 9
ln (Co/Ce) versus time graphs for Co2+ ion MDLM extraction studies at different temperatures (293.15–308.15 K).
Figure 10
Figure 10
Graphical representation of the Arrhenius equation.
Figure 11
Figure 11
Concentrations of Co2+ ions versus time graphs for MDLM extraction studies of (a) donor, (b) acceptor, and (c) organic phase at different donor phase pH values (pH 4.00–7.00).
Figure 12
Figure 12
ln (Co/Ce) versus time graphs for Co2+ ion MDLM extraction studies at different donor phase pH values (pH 3.00–7.00).
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