Extraction of PFOA from dilute wastewater using ionic liquids that are dissolved in N-octanol
| Autor: | Kaihang Zhang, Dong Wang, Junchen Yan, David Kujawski, Chris H. Spurrell, John C. Crittenden |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Octanol
021110 strategic defence & security studies Ammonium bromide Environmental Engineering Chromatography Aqueous solution Health Toxicology and Mutagenesis Extraction (chemistry) 0211 other engineering and technologies 02 engineering and technology 010501 environmental sciences 01 natural sciences Pollution chemistry.chemical_compound chemistry Liquid–liquid extraction Emulsion Ionic liquid Environmental Chemistry Perfluorooctanoic acid Waste Management and Disposal 0105 earth and related environmental sciences |
| Zdroj: | Journal of hazardous materials. 404 |
| ISSN: | 1873-3336 |
| Popis: | Polyfluoroalkyl Substances (PFAS) such as perfluorooctanoic acid (PFOA) are resistant to biodegradation leading to adverse health outcomes. Therefore, PFAS removal from drinking water is paramount. Liquid-liquid extraction processes can remove them from water; however, the hydrophobic and oleophobic properties of PFOA lead to the low extraction efficiency and severe emulsification, especially for the ppm-levels concentration of PFOA. Therefore, we introduced ionic liquid (IL) methyltrioctylammonium bis(trifluoromethylsulfonyl)imide ([A336][NTf2]) as extractant into octanol. We found that using hexadecyl trimethyl ammonium bromide (CTAB) as an extractant caused severe and stable emulsion. In comparison, [A336][NTf2] could suppress the emulsification with high extraction efficiency. The extraction performance of PFOA was examined as a function of various parameters. The results showed that the extraction efficiency was strongly dependent on the concentration of IL and aqueous pH. Further research revealed the extraction mechanisms at the molecular-level, and density functional theory (DFT) and molecular dynamic (MD) simulation agreed with the trends in the experiment. We determined that the extraction efficiency of PFOA from water could be up to 88.21 wt% for the optimized condition, indicating that the extraction system of [A336][NTf2] + octanol was efficient for separating PFOA from the diluted aqueous solution. |
| Databáze: | OpenAIRE |
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