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Published on: December 20, 2016
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Selective Co(II) and Ni(II) Separation Using the Trihexyl(tetradecyl)phosphonium Decanoate Ionic Liquid
Anđela Kovačević1, José Alejandro Ricardo García1, Marilena Tolazzi1
1Chemical Technologies Laboratories, Polytechnic Department of Engineering, University of Udine, Via Cotonificio 108, 33100 Udine, Italy.
Molecules (Basel, Switzerland)
|October 16, 2024
Summary
This study shows that the ionic liquid trihexyl(tetradecyl)phosphonium decanoate effectively extracts cobalt over nickel from hydrochloric acid solutions. Optimal separation was achieved at high acid concentrations using both liquid-liquid extraction and polymer inclusion membranes.
Area of Science:
- Materials Science
- Chemical Engineering
- Separation Science
Background:
- Ionic liquids (ILs) offer tunable properties for selective metal ion extraction.
- Separating cobalt (Co(II)) from nickel (Ni(II)) is crucial in hydrometallurgy.
- Carboxylate-based ILs present a novel approach for Co/Ni separation.
Purpose of the Study:
- To investigate the liquid-liquid extraction of Co(II) from HCl solutions using the ionic liquid [P66614][Dec].
- To evaluate the influence of HCl concentration on Co(II) extraction and Co/Ni selectivity.
- To develop and test polymer inclusion membranes (PIMs) incorporating [P66614][Dec] for Co(II) separation.
Main Methods:
- Liquid-liquid extraction experiments with varying HCl concentrations.
- Preparation and characterization of polymer inclusion membranes (PIMs) with different PVC:[P66614][Dec] ratios.
- Analysis of Co(II) and Ni(II) concentrations using appropriate analytical techniques.
Main Results:
- Extraction efficiency and Co/Ni selectivity were highly dependent on HCl concentration, peaking above 6 M HCl.
- Protonation of the decanoate anion and metal speciation explained the observed extraction behavior.
- A PIM with a 30:70 PVC:[P66614][Dec] ratio showed effective Co(II) extraction, comparable to biphasic liquid extraction at 8 M HCl.
Conclusions:
- The ionic liquid [P66614][Dec] demonstrates significant potential for selective Co(II) extraction from HCl solutions.
- High acid concentrations are critical for achieving efficient Co/Ni separation.
- PIMs incorporating carboxylate-based ILs are a viable technology for practical Co/Ni separation applications.
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