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使用癸酸三己基（十四烷基）鏻离子液体选择性分离Co(II)和Ni(II)

Selective Co(II) and Ni(II) Separation Using the Trihexyl(tetradecyl)phosphonium Decanoate Ionic Liquid.

作者信息

Kovačević Anđela, Ricardo García José Alejandro, Tolazzi Marilena, Melchior Andrea, Sanadar Martina

机构信息

Chemical Technologies Laboratories, Polytechnic Department of Engineering, University of Udine, Via Cotonificio 108, 33100 Udine, Italy.

Centre de Biophysique Moléculaire, CNRS, UPR 4301, Université d'Orléans, Rue Charles Sadron, 45071 Orléans, Cedex 2, France.

出版信息

Molecules. 2024 Sep 25;29(19):4545. doi: 10.3390/molecules29194545.

DOI:10.3390/molecules29194545
PMID:39407475
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11477661/
Abstract

The room temperature ionic liquid trihexyl(tetradecyl)phosphonium decanoate ([P][Dec]) was employed in the liquid-liquid extraction of Co(II) from hydrochloric acid solutions in the presence of Ni(II). The extraction performance in liquid-liquid separations showed a strong dependence on the acid content of the feed aqueous solution. The best performance in terms of extracted cobalt and selectivity was obtained when the feed contained a HCl concentration above 6 M On the contrary, when the experiment was performed in absence of HCl, a lower extraction and Co/Ni selectivity were obtained. This behavior has been rationalized by considering the protonation of the [Dec] anion and the different Co(II)/Ni(II) speciation in HCl media. Moreover, polymer inclusion membranes (PIMs) were prepared using PVC and [P][Dec] at different weight rations. Only the PIM formulated with a 30:70/PVC:[P][Dec] weight ratio demonstrated effective extraction of Co(II) from the HCl solution. The extraction efficiency and selectivity of the PIM was comparable to that from biphasic liquid experiments at 8 M HCl. The results of this study constitute a promising background for further practical developments of carboxylate-based ILs applied in Co/Ni separations.

摘要

在镍（II）存在的情况下，采用室温离子液体三己基（十四烷基）磷酸癸酯（[P][Dec]）从盐酸溶液中液液萃取钴（II）。液液分离中的萃取性能强烈依赖于进料水溶液的酸含量。当进料中盐酸浓度高于6 M时，在萃取钴和选择性方面表现出最佳性能。相反，在无盐酸的情况下进行实验时，萃取率和钴/镍选择性较低。通过考虑[Dec]阴离子的质子化以及盐酸介质中不同的钴（II）/镍（II）形态，对这种行为进行了合理的解释。此外，使用聚氯乙烯（PVC）和[P][Dec]以不同重量比制备了聚合物包容膜（PIM）。只有以30:70/PVC:[P][Dec]重量比配制的PIM证明能从盐酸溶液中有效萃取钴（II）。该PIM的萃取效率和选择性与在8 M盐酸下的双相液体实验相当。本研究结果为进一步实际开发用于钴/镍分离的羧酸盐基离子液体奠定了有前景的基础。

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