title: Task-specific thioglycolate ionic liquids for heavy metal extraction: Synthesis, extraction efficacies and recycling properties.
abstract: Eight novel task-specific ionic liquids (TSILs) based on the thioglycolate anion designed for heavy metal extraction have been prepared and characterized by1H and13C NMR, UV-Vis, infrared, ESI-MS, conductivity, viscosity, density and thermal properties. Evaluation of their time-resolved extraction abilities towards cadmium(II) and copper(II) in aqueous solutions have been investigated where distribution ratios up to 1200 were observed. For elucidation of the IL extraction mode, crystals were grown where Cd(II) was converted with an excess of S-butyl thioglycolate. It was found by X-ray diffraction analysis that cadmium is coordinated by five oxygen and one sulfur donor atoms provided by two thioglycolate molecules and one water molecule. Leaching behavior of the hydrophobic ionic liquids into aqueous systems was studied by TOC (total dissolved organic carbon) measurements. Additionally, the immobilization on polypropylene was elucidated and revealed slower metal extraction rates and similar leaching behavior. Finally, recovery processes for cadmium and copper after extraction were performed and recyclability was successfully proven for both metals.
authors.affiliation: Institute of Inorganic Chemistry, Faculty of Chemistry, University of Vienna, Waehringer Str. 42, 1090 Vienna, Austria.
authors.forename: Sonja
authors.initials: S
authors.lastname: Platzer
authors.affiliation: School of Chemistry, Monash University, Clayton, Victoria 3800, Australia.
authors.forename: Mega
authors.initials: M
authors.lastname: Kar
authors.affiliation: Institute of Inorganic Chemistry, Faculty of Chemistry, University of Vienna, Waehringer Str. 42, 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, 1090 Vienna, Austria.
authors.forename: Sonia
authors.initials: S
authors.lastname: Chib
authors.affiliation: Institute of Inorganic Chemistry, Faculty of Chemistry, University of Vienna, Waehringer Str. 42, 1090 Vienna, Austria.
authors.forename: Alexander
authors.initials: A
authors.lastname: Roller
authors.affiliation: Institute of Inorganic Chemistry, Faculty of Chemistry, University of Vienna, Waehringer Str. 42, 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, 1090 Vienna, Austria.
authors.forename: Regina
authors.initials: R
authors.lastname: Krachler
authors.affiliation: School of Chemistry, Monash University, Clayton, Victoria 3800, Australia.
authors.forename: Douglas R
authors.initials: DR
authors.lastname: MacFarlane
authors.affiliation: Institute of Inorganic Chemistry, Faculty of Chemistry, University of Vienna, Waehringer Str. 42, 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, 1090 Vienna, Austria.
authors.forename: Bernhard K
authors.initials: BK
authors.lastname: Keppler
keywords: Heavy metal extraction; Immobilization; Reusability; Task-specific ionic liquids; Thioglycolic acid