Task-specific thioglycolate ionic liquids for heavy metal extraction: Synthesis, extraction efficacies and recycling properties
| Autor: | Sonja Platzer, Wolfgang Kandioller, Sonia Chib, Mega Kar, Alexander Roller, Raphlin Leyma, Bernhard K. Keppler, Douglas R. MacFarlane, Franz Jirsa, Regina Krachler |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Environmental Engineering
Health Toxicology and Mutagenesis Task-specific ionic liquids Inorganic chemistry chemistry.chemical_element 02 engineering and technology 010402 general chemistry 01 natural sciences Metal Immobilization chemistry.chemical_compound Environmental Chemistry Thioglycolic acid Waste Management and Disposal Dissolution Reusability Cadmium Aqueous solution 021001 nanoscience & nanotechnology Pollution Copper 0104 chemical sciences chemistry visual_art Ionic liquid visual_art.visual_art_medium Heavy metal extraction Leaching (metallurgy) 0210 nano-technology |
| Zdroj: | Journal of Hazardous Materials. 324:241-249 |
| ISSN: | 0304-3894 |
| DOI: | 10.1016/j.jhazmat.2016.10.054 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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