| Title: | Hydrophobic deep eutectic solvents as green absorbents for hydrophilic VOC elimination |
| Author(s): | Chen CC; Huang YH; Fang JY; |
| Address: | "Department of Environmental Engineering and Science, Feng Chia University, Taichung City 407, Taiwan, ROC. Electronic address: chunchi@mail.fcu.edu.tw. Department of Environmental Engineering and Science, Feng Chia University, Taichung City 407, Taiwan, ROC" |
| DOI: | 10.1016/j.jhazmat.2021.127366 |
| ISSN/ISBN: | 1873-3336 (Electronic) 0304-3894 (Linking) |
| Abstract: | "As a common hydrophilic volatile organic compound (VOC), acetone is known to harm human health and the atmospheric environment. Absorption is a typical technique applied to capture hydrophilic VOCs; however, the difficulty of separating and recovering absorbed hydrophilic VOCs (e.g., acetone) from aqueous absorbents has become one of the major challenges in practical applications. Hydrophobic deep eutectic solvents (DESs) have therefore been developed as novel green absorbents for capturing hydrophilic VOCs in the present work. The compiled results show that efficient hydrophilic VOC elimination can be accomplished by the proposed hydrophobic DESs through high absorption capacity and thermodynamically favorable gas-to-liquid mass transfer. Among the explored DESs, the hydrophobic DES containing thymol [Thy] and decanoic acid [DecA] with a molar ratio of 1:1 has achieved the highest absorption capacity of acetone, i.e., 6.57 mg acetone per g DES at 20 degrees C and 1480 ppm acetone. The oxygen of acetone interacts favorably with the hydrogen atom of [Thy] upon absorption, rendering hydrogen bonding interaction surpassing polarity as the key factor in attaining superior solubility of acetone in DESs. Moreover, the absorbed acetone can be easily removed from Thy-based DESs, realizing an effective hydrophilic VOC elimination process with economic and ecological benefits" |
| Keywords: | Deep Eutectic Solvents Humans Hydrogen Bonding Hydrophobic and Hydrophilic Interactions Solvents *Volatile Organic Compounds Absorption Hydrophilic volatile organic compounds Hydrophobic deep eutectic solvent Regeneration Thymol; |
| Notes: | "MedlineChen, Chun-Chi Huang, Yen-Hui Fang, Jia-Yu eng Research Support, Non-U.S. Gov't Netherlands 2021/10/16 J Hazard Mater. 2022 Feb 15; 424(Pt B):127366. doi: 10.1016/j.jhazmat.2021.127366. Epub 2021 Sep 29" |
