Novel thiosalicylate-based ionic liquids for heavy metal extractions

Raphlin Leyma; Sonja Platzer; Franz Jirsa; Wolfgang Kandioller; Regina Krachler; Bernhard K Keppler

doi:10.1016/j.jhazmat.2016.04.038

Novel thiosalicylate-based ionic liquids for heavy metal extractions

J Hazard Mater. 2016 Aug 15:314:164-171. doi: 10.1016/j.jhazmat.2016.04.038. Epub 2016 Apr 19.

Authors

Raphlin Leyma¹, Sonja Platzer¹, Franz Jirsa², Wolfgang Kandioller³, Regina Krachler¹, Bernhard K Keppler¹

Affiliations

¹ Institute of Inorganic Chemistry, Faculty of Chemistry, University of Vienna, Waehringer Str. 42, A-1090 Vienna, Austria.
² 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.
³ Institute of Inorganic Chemistry, Faculty of Chemistry, University of Vienna, Waehringer Str. 42, A-1090 Vienna, Austria. Electronic address: wolfgang.kandioller@univie.ac.at.

PMID: 27131456
DOI: 10.1016/j.jhazmat.2016.04.038

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.

Keywords: Heavy metal; Heavy metal extraction; Ionic liquid; Thiosalicylic acid.

Publication types

Research Support, Non-U.S. Gov't