title: Novel thiosalicylate-based ionic liquids for heavy metal extractions.
abstract: This study aims to develop novel ammonium and phosphonium ionic liquids (ILs) with thiosalicylate (TS) derivatives as anions and evaluate their extracting efficiencies towards heavy metals in aqueous solutions. Six ILs were synthesized, characterized, and investigated for their extracting efficacies for cadmium, copper, and zinc. Liquid-liquid extractions of Cu, Zn, or Cd with ILs after 1-24h using model solutions (pH 7; 0.1M CaCl2) were assessed using flame atomic absorption spectroscopy (F-AAS). Phosphonium-based ILs trihexyltetradecylphosphonium 2-(propylthio)benzoate [P66614][PTB] and 2-(benzylthio)benzoate [P66614][BTB] showed best extraction efficiency for copper and cadmium, respectively and zinc was extracted to a high degree by [P66614][BTB] exclusively.
authors.affiliation: Institute of Inorganic Chemistry, Faculty of Chemistry, University of Vienna, Waehringer Str. 42, A-1090 Vienna, Austria.
authors.forename: Raphlin
authors.initials: R
authors.lastname: Leyma
authors.affiliation: Institute of Inorganic Chemistry, Faculty of Chemistry, University of Vienna, Waehringer Str. 42, A-1090 Vienna, Austria.
authors.forename: Sonja
authors.initials: S
authors.lastname: Platzer
authors.affiliation: Institute of Inorganic Chemistry, Faculty of Chemistry, University of Vienna, Waehringer Str. 42, A-1090 Vienna, Austria; Department of Zoology, University of Johannesburg, PO Box 524, Auckland Park, 2006, Johannesburg, South Africa.
authors.forename: Franz
authors.initials: F
authors.lastname: Jirsa
authors.affiliation: Institute of Inorganic Chemistry, Faculty of Chemistry, University of Vienna, Waehringer Str. 42, A-1090 Vienna, Austria. Electronic address: wolfgang.kandioller@univie.ac.at.
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Kandioller
authors.affiliation: Institute of Inorganic Chemistry, Faculty of Chemistry, University of Vienna, Waehringer Str. 42, A-1090 Vienna, Austria.
authors.forename: Regina
authors.initials: R
authors.lastname: Krachler
authors.affiliation: Institute of Inorganic Chemistry, Faculty of Chemistry, University of Vienna, Waehringer Str. 42, A-1090 Vienna, Austria.
authors.forename: Bernhard K
authors.initials: BK
authors.lastname: Keppler
keywords: Heavy metal; Heavy metal extraction; Ionic liquid; Thiosalicylic acid