The Influence of Hydrogen Bond Donors on the CO2 Absorption Mechanism by the Bio-Phenol-Based Deep Eutectic Solvents

Recently, deep eutectic solvents (DESs), a new type of solvent, have been studied widely for CO2 capture. In this work, the anion-functionalized deep eutectic solvents composed of phenol-based ionic liquids (ILs) and hydrogen bond donors (HBDs) ethylene glycol (EG) or 4-methylimidazole (4CH3-Im) wer...

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Bibliographic Details
Published in:Molecules (Basel, Switzerland) Switzerland), 2021-11, Vol.26 (23), p.7167
Main Authors: Wang, Ze, Wang, Zonghua, Chen, Jie, Wu, Congyi, Yang, Dezhong
Format: Article
Language:English
Subjects:
Absorption
Anions
capture
Carbon dioxide
Carbonates
Carvacrol
Climate change
deep eutectic solvents
Fourier transforms
Functional groups
Hydrogen bonds
insights
Ionic liquids
Mass spectroscopy
NMR
Nuclear magnetic resonance
Phenolic compounds
Phenols
Solvents
spectroscopy
Spectrum analysis
Thymol
Viscosity
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Summary:Recently, deep eutectic solvents (DESs), a new type of solvent, have been studied widely for CO2 capture. In this work, the anion-functionalized deep eutectic solvents composed of phenol-based ionic liquids (ILs) and hydrogen bond donors (HBDs) ethylene glycol (EG) or 4-methylimidazole (4CH3-Im) were synthesized for CO2 capture. The phenol-based ILs used in this study were prepared from bio-derived phenols carvacrol (Car) and thymol (Thy). The CO2 absorption capacities of the DESs were determined. The absorption mechanisms by the DESs were also studied using nuclear magnetic resonance (NMR), Fourier transform infrared (FTIR), and mass spectroscopy. Interestingly, the results indicated that CO2 reacted with both the phenolic anions and EG, generating the phenol-based carbonates and the EG-based carbonates, when CO2 interacted with the DESs formed by the ILs and EG. However, CO2 only reacted with the phenolic anions when the DESs formed by the ILs and 4CH3-Im. The results indicated that the HBDs impacted greatly on the CO2 absorption mechanism, suggesting the mechanism can be tuned by changing the HBDs, and the different reaction pathways may be due to the steric hinderance differences of the functional groups of the HBDs.
ISSN:1420-3049
1420-3049
DOI:10.3390/molecules26237167