Toxicity of various anions associated with methoxyethyl methyl imidazolium-based ionic liquids on Clostridium sp.

Hao Wang, Sanjay V. Malhotra, Arokiasamy J. Francis

Research output: Contribution to journalArticlepeer-review

62 Scopus citations

Abstract

We investigated the effects on the growth of the anaerobic bacterium, Clostridium sp., of the ionic liquid, 1-methoxyethyl-3-methyl imidazolium [MOEMIM]+, derived from imidazolium cation and paired with one of a variety of counter-ions, viz., tetrafluoroborate [BF4]-, hexafluorophosphate [PF6]-, trifluoroacetate [CF3COO]-, bis(trifluoromethane)sulfonamide [Tf2N]-, methane sulfonate [OMS], and 1-butyl-3-methyl imidazolium tetrafluoroborate [BMIM][BF4]. These anions, in association with [MOEMIM]+ lowered the growth rate of the bacterium, showing the following trend: [Tf2N]-≧[PF6]->[BF4]->[CF3COO]->[OMS]-. Anions incorporating fluorine were more toxic than those without it, and their toxicity rose with an increase in the number of fluorine atoms. Also, [MOEMIM]+ [BF4]- was less toxic than [BMIM]+ [BF4]-, probably due to the presence of a methoxyethyl functional group integrated in the cation side chain.

Original languageEnglish (US)
Pages (from-to)1597-1603
Number of pages7
JournalChemosphere
Volume82
Issue number11
DOIs
StatePublished - Mar 2011
Externally publishedYes

Keywords

  • Anions
  • Bacteria
  • Clostridium sp.
  • Ionic liquids
  • Toxicity

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Chemistry(all)
  • Pollution
  • Health, Toxicology and Mutagenesis

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