Selective Transport of Bismuth from Heavy Metal Solution by Ionic Liquid-Based Polymer Inclusion Membrane IL-PIM
Abstract
Bismuth is an important critical metal which is under risk of supply. It is mainly found and
extracted at trace amounts in copper, lead, tin and gold mining by-product. In this work, we present the results
of the selective transport of trace bismuth Bi(III) from a solution of heavy metals by an Ionic liquids-based
Polymer Inclusion Membranes (PIM), using the task-specific ionic liquid: trihexyl(tetradecyl) phosphonium
salicylate (THTDPS), as extractant and ion carrier. The TS-IL was first synthesized by exchanging the inorganic
anion of trihexyl(tetradecyl) phosphonium chloride Cyphos IL 101 with the organic anion of sodium salycilate.
Important parameters influencing extraction and transport have been examined and optimized. The studied PIM
is composed of 50% CTA, and 50% THTDPS without any additional chemical (modifier or plasticizer).
The performance and stability of the PIM was carried out in depth. The selective transport of Bi(III) from
a solution containing the heavy metals: Pb(II), Cu(II), Cd(III), Ni(II) was carried out. The feed phase is
composed of trace concentration of the metal ions (10 mg.L-1
) in 1M HCl. The optimal receiving phase
conditions were studied and the best composition is EDTA 0.05M at pH 5. The PIM exhibits a good selectivity
towards Bi(III), and the transport rates are reported to be 74.8 ± 9% for Bi(III), against 62.23%, 14.8 ± 9%, 3.15
± 3.15%, and 2.5 ± 2.5% for Cd(II), Pb(II), Cu(II), and Ni(II), respectively. The study of the stability shows that
the PIM can be used up to 5 cycles of extraction-back extraction without significant decrease in the efficiency.
References
- Malki, M., Meziani R., Mitiche, L., Sahmoune, A., & Fontas C. (2025). Selective transport of bismuth from heavy metal solution by ionic liquid-based polymer inclusion membrane IL-PIM. The Eurasia Proceedings of Science, Technology, Engineering and Mathematics (EPSTEM), 34, 333-338.
Details
| Primary Language | English |
|---|---|
| Subjects | Separation Processes |
| Journal Section | Articles |
| Authors | |
| Early Pub Date | August 1, 2025 |
| Publication Date | August 1, 2025 |
| Submission Date | March 7, 2025 |
| Acceptance Date | April 29, 2025 |
| Published in Issue | Year 2025 Volume: 34 |
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