Solvent Extraction of Sr2+ and Cs+ Based on Hydrophobic Protic Ionic Liquids

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Abstract

A series of new hydrophobic and protic alkylammonium ionic liquids with bis(trifluoromethyl-sulfonyl)imide or bis(perfluoroethylsulfonyl)imide as conjugated anions was synthesized in a one-pot reaction with a high yield. In essence our synthesis method involves the combination of neutralization and metathesis reactions. Some of these hydrophobic and protic ionic liquids were liquids at room temperature and therefore investigated as new extraction media for separation of Sr2+ and Cs+ from aqueous solutions. An excellent extraction efficiency was found for some of these ionic liquids using dicyclohexano-18-crown-6 and calix[4]arene-bis(tert-octylbenzo-crown-6) as extractants. The observed enhancement in the extraction efficiency can be attributed to the greater hydrophilicity of the cations of the protic ionic liquids. The application of the protic ionic liquids as new solvent systems for solvent extraction opens up a new avenue in searching for simple and efficient ionic liquids for tailored separation processes.

Original languageEnglish
Pages (from-to)281-291
Number of pages11
JournalZeitschrift fur Naturforschung - Section A Journal of Physical Sciences
Volume62
Issue number5-6
DOIs
StatePublished - Jun 2007

Funding

This research was supported by the Environmental Management Science Program of the Office of Science and Environmental Management, U.S. Department of Energy, under Contract DE-AC05-0096OR22725 with Oak Ridge National Laboratory, managed by UT-Battelle, LLC. The authors would like to thank Mr. Yuchen Lu of Chemical Sciences Division at Oak Ridge National Laboratory for performing electrospray mass spectra. Sheng Dai would like to thank Basic Energy Sciences, U.S. Department of Energy, under Contract DE-AC05-0096OR22725 with Oak Ridge National Laboratory for financial support.

Keywords

  • Crown Ethers
  • Protic Ionic Liquids
  • Solvent Extraction

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