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Extraction of Metal Ions from Aqueous Solutions Using Imidazolium Based Ionic Liquids

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Abstract

This article represents a step towards how to choose an ionic liquid as the solvent to improve metal ion (Ag+ and Pb2+) extraction. The liquid-liquid solvent extraction is proposed with the following imidazolium ionic liquids (ILs): 1-ethyl-3-ethylimidazolium, or 1-butyl-3-ethylimidazolium, or 1-hexyl-3-ethylimidazolium bis{(trifluoromethyl)sylfonyl}imide [EEIM][NTf2], or [BEIM][NTf2], or [HEIM][NTf2], or 1-butyl-3-ethylimidazolium hexafluorophosphate [BEIM][PF6], or 1-hexyl-3-ethylimidazolium hexafluorophosphate [HEIM][PF6] and the popular 1-butyl-3-methylimidazolium hexafluorophosphate [BMIM][PF6] for comparison. The effect of anion type (NTf −2 versus PF −6 ) and the effect of structural components of an ionic liquid including alkyl chain length at the cation and the ethyl substituent instead methyl at the cation, on the extraction and re-extraction processes by using dithizone as a metal chelator, were studied at 296 K. Dithizone was employed to form neutral metal-dithizone complexes with heavy metal ions to extract them from aqueous solution into the ILs.

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  1. Physical Chemistry Division, Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664, Warsaw, Poland

    Urszula Domańska & Anna Rękawek

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  1. Urszula Domańska
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  2. Anna Rękawek
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Correspondence to Urszula Domańska.

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Domańska, U., Rękawek, A. Extraction of Metal Ions from Aqueous Solutions Using Imidazolium Based Ionic Liquids. J Solution Chem 38, 739–751 (2009). https://doi.org/10.1007/s10953-009-9402-7

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  • DOI: https://doi.org/10.1007/s10953-009-9402-7

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