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Behavior and mechanism investigation on separating Pt and Ir in liquid-liquid extraction with mixed [C6bet]Br/[C6mim][NTF2] system

Abstract

In the process of recovering platinum group metals using extraction, separation of Pt and Ir is very difficult because Pt(IV) and Ir(IV) show similar chemical properties and extraction behaviours in hydrochloric acid medium. In this paper, a betaine-based ionic liquid [C6bet]Br was firstly applied to the separation of Pt(IV) and Ir(IV). [C6bet]Br showed remarkable precipitation performance of Pt(IV) and Ir(IV). The impactful extraction was realized by importing [C6mim][NTF2] as hydrophobic phase with the extraction efficiencies of ca. 99% and 88% under the optimal conditions. A selective reduction process for Ir(IV) was firstly proposed for the separation of these two similar PGMs by using hydroxylamine hydrochloride (NH2OH•HCl). The mechanism of extracting Pt(IV)/Ir(IV) by [C6bet]Br was comfirmed to be anion-exchange process by spectroscopic analysis (UV-Vis, FT-IR, 1H NMR) and the method of continuous variation. The electrostatic potential map of [C6bet]Br was calculated for the first time to confirm the anion-exchange mechanism. 8 M HCl was effective for the back extraction of Pt(IV) and Ir(IV).

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Publication details

The article was accepted on 12 Jul 2017 and first published on 13 Jul 2017


Article type: Paper
DOI: 10.1039/C7NJ02361H
Citation: New J. Chem., 2017, Accepted Manuscript
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    Behavior and mechanism investigation on separating Pt and Ir in liquid-liquid extraction with mixed [C6bet]Br/[C6mim][NTF2] system

    Y. Yan, Q. Wang, Z. Xiang, Y. Zheng, S. Wang and Y. Yang, New J. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7NJ02361H

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