Task-specific thioglycolate ionic liquids for heavy metal extraction: Synthesis, extraction efficacies and recycling properties

Author(s)

Sonja Platzer, Mega Kar, Raphlin Leyma, Sonia Chib, Alexander Roller, Franz Jirsa, Regina Krachler, Douglas R. MacFarlane, Wolfgang Kandioller, Bernhard K. Keppler

Abstract

Eight novel task-specific ionic liquids (TSILs) based on the thioglycolate anion designed for heavy metal extraction have been prepared and characterized by

¹H and

¹³C 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.

Organisation(s)

Department of Organic Chemistry, Department of Inorganic Chemistry, X-ray Structure Analysis Centre

External organisation(s)

Monash University, University of Johannesburg (UJ)

Journal

Journal of Hazardous Materials

Volume

324

Pages

241-249

No. of pages

9

ISSN

0304-3894

DOI

https://doi.org/10.1016/j.jhazmat.2016.10.054

Publication date

02-2017

Peer reviewed

Yes

Austrian Fields of Science 2012

104003 Inorganic chemistry, 207111 Environmental engineering

Keywords

Portal url

https://ucrisportal.univie.ac.at/en/publications/taskspecific-thioglycolate-ionic-liquids-for-heavy-metal-extraction-synthesis-extraction-efficacies-and-recycling-properties(4c3421c0-08f2-4507-b5d8-a8e90aff3648).html