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Bio-derived thymol/MEA deep eutectic solvent for efficient CO2 absorption
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DOI：10.1016/j.seppur.2025.133569.png)
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Abstract
En 中文
As the primary contributor to global warming, carbon dioxide (CO2) necessitates efficient capture strategies, with chemical absorption emerging as a technologically mature approach. This study developed a thymol-based deep eutectic solvent (THY-MEA) using bio-derived thymol (hydrogen bond acceptor) and ethanolamine (hydrogen bond donor) in a 1:3 M ratio, demonstrating exceptional CO2 capture performance. Systematic absorption/ desorption evaluations revealed a remarkable capacity of 0.1537 g CO2/g DES (40 degrees C, 1 atm), surpassing most reported bio-derived absorbents. The solvent achieved 64 % lower regeneration energy consumption compared to conventional 30 wt% MEA aqueous solutions while maintaining over 90 % regeneration efficiency through five consecutive cycles. Mechanistic investigations through FT-IR and 13C NMR spectroscopy elucidated that CO2 capture predominantly occurred through carbamate formation via the-NH2 group in MEA reacted with CO2. This work establishes THY-MEA as a sustainable alternative with combined advantages of biomass-derived components, low energy penalty, and stable recyclability, providing critical insights for designing CO2 capture agents.
Keywords:
CO (2) capture
Absorption
Deep eutectic solvents
Bio-based materials
Journal
IF:
9
Papers:
2.9W
Citations:
12.1W