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. 2022 Jun 2;46(5):1594-1606.
doi: 10.55730/1300-0527.3463. eCollection 2022.

Single and selective transport of Zr(IV) ions with trioctyl amine dissolved in kerosene using a multidropped liquid membrane technique

Fatma Tezcan  1 , Ramazan Donat  1
Affiliations

Single and selective transport of Zr(IV) ions with trioctyl amine dissolved in kerosene using a multidropped liquid membrane technique

Fatma Tezcan et al. Turk J Chem. .

Abstract

It is very important to develop a process for selectively extracting Zr(IV) ions from the solution medium to produce zirconium metal used in industry and nuclear reactors. In this study, the parameters affecting the extraction of Zr(IV) ions were investigated using a multidropped liquid membrane (MDLM) system. Trioctyl amine (TOA) dissolved in kerosene was used as a carrier ligand in the extraction of Zr(IV) ions by the MDLM technique. The effect of carrier concentration and stripping solution concentration, pH, and the temperature in the donor phase on the transport of Zr(IV) were investigated. The optimum condition for the transportation of Zr(IV) was a 0.50 M H2SO4 solution as donor phase, 0.10 molL-1 TOA as a carrier, and 0.10 M Na2CO3 as acceptor phase. The transport percentage of Zr(IV) was increased up to >99% and the calculated activation energy which is 6.36 kcal mol-1 indicated that the process was diffusion controlled by Zr(IV) ions. The results showed that the MDLM system, which resembles a bulky membrane system in shape, is a promising technique for the extraction of Zr(IV) ions from an acidic solution. It is more practical and effective than bulk, supported, or inclusion, and emulsion liquid membrane techniques.

Keywords: MDLM system; TOA; Zr(IV) ion; extraction; transport.

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Conflict of interest statement

Conflict of interest The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Schema of the measuring set with flowing MDLM system.
Figure 2
Figure 2
Graph of the change over time of the concentration of Zr(IV) ions in three phases with four different TOA concentrations in continuous extraction studies.
Figure 3
Figure 3
The graph of extraction kinetics of Zr(IV) ions for experiments carried out at different TOA concentrations.
Figure 4
Figure 4
Concentrations of Zr(IV) ions in the phases versus time for the experiments carried out at different acceptor phase concentrations.
Figure 5
Figure 5
Graph of time versus ln(Co/Ce) for five different temperatures.
Figure 6
Figure 6
1/T versus ln Jamak graph for five different temperatures (288.15–308.15 K).
Figure 7
Figure 7
Na2CO3 concentration in three different acceptor phases and Zr(IV) ions concentration in three phases over time.
Figure 8
Figure 8
The graph of the extraction kinetics of Zr(IV) ions for experiments performed at different Na2CO3 concentrations (0.05–0.15 M).
Figure 9
Figure 9
H2SO4 concentration in four different donor phases and Zr(IV) ions concentration in four phases over time.
Figure 10
Figure 10
1/T versus ln Co/Ce plot for four different H2SO4 concentrations.
Figure 11
Figure 11
The reaction mechanism of Zr(IV) with carrier ligands in donor, organic, and acceptor phases in MDLM system.
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