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Efficient removal of gold complexes from water by precipitation or liquid-liquid extraction using ionic liquids

Version 2 2024-06-13, 11:19
Version 1 2018-07-12, 09:57
journal contribution
posted on 2024-06-13, 11:19 authored by N Papaiconomou, G Vite, N Goujon, JM Lévêque, I Billard
Extraction of tetrachloroaurate or tetrabromoaurate anions has been carried out at acidic pHs (1 and 4) with several ionic liquids bearing halide or bis(trifluoromethanesulfonyl)imide NTf2- anions and cations 1-octyl-3-methylimidazolium, 1-octylpyridinium or 1-methyl-1- octylpyrrolidinium. The removal of gold anionic moieties from water was first studied by mixing aqueous solutions containing gold complexes and water soluble halide (chloride or bromide) ionic liquids. This lead to the formation of either a solid precipitate or a liquid phase corresponding to a hydrophobic ionic liquid based on a tetrahalogenoaurate anion. Values below 10-6 for the solubility products of gold-bearing ionic liquids were obtained. Liquid-liquid extraction of anionic gold complexes with hydrophobic ionic liquids was also carried out. Gold was successfully extracted from water whatever the pH and the ionic liquid used. Distribution coefficients ranged from 3 × 102 to 3 × 104. Investigation on the extraction mechanism revealed an anion exchange between one anionic gold complex and one NTf2- anion.

History

Journal

Green chemistry

Volume

14

Pagination

2050-2056

Location

Cambridge, Eng.

ISSN

1463-9262

eISSN

1463-9270

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2012, The Royal Society of Chemistry

Issue

7

Publisher

Royal Society of Chemistry

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