TY - JOUR
T1 - Task-specific thioglycolate ionic liquids for heavy metal extraction
T2 - synthesis, extraction efficacies and recycling properties
AU - Platzer, Sonja
AU - Kar, Mega
AU - Leyma, Raphlin
AU - Chib, Sonia
AU - Roller, Alexander
AU - Jirsa, Franz
AU - Krachler, Regina
AU - Macfarlane, Douglas
AU - Kandioller, Wolfgang
AU - Keppler, Bernhard K.
PY - 2017/2/15
Y1 - 2017/2/15
N2 - 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.
AB - 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.
KW - Heavy metal extraction
KW - Immobilization
KW - Reusability
KW - Task-specific ionic liquids
KW - Thioglycolic acid
UR - http://www.scopus.com/inward/record.url?scp=85003679958&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2016.10.054
DO - 10.1016/j.jhazmat.2016.10.054
M3 - Article
AN - SCOPUS:85003679958
VL - 324
SP - 241
EP - 249
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
SN - 0304-3894
ER -