Deep eutectic solvents composed of bio-phenol-derived superbase ionic liquids and ethylene glycol for CO2 capture

Ze Wang; Zonghua Wang; Xin Huang; Dezhong Yang; Congyi Wu; Jie Chen

doi:10.1039/d1cc06856c

Deep eutectic solvents composed of bio-phenol-derived superbase ionic liquids and ethylene glycol for CO₂ capture

Chem Commun (Camb). 2022 Feb 10;58(13):2160-2163. doi: 10.1039/d1cc06856c.

Authors

Ze Wang¹, Zonghua Wang¹, Xin Huang¹, Dezhong Yang¹, Congyi Wu¹, Jie Chen¹

Affiliation

¹ School of Science, China University of Geosciences, Beijing 100083, China. yangdz@cugb.edu.cn.

PMID: 35060571
DOI: 10.1039/d1cc06856c

Abstract

Deep eutectic solvents (DESs) formed by bio-phenol-derived superbase ionic liquids (ILs) and ethylene glycol (EG) exhibit a high CO₂ capacity, up to 1.0 mol CO₂/mol DESs, which is much better than those of the parent ILs. Surprisingly, mechanism results indicate that CO₂ reacts with EG, but doesn't react with phenolic anions in the solvent, which is different from other DESs formed by superbase ILs and EG. The reaction pathway between CO₂ and DESs used in this work may include two steps. The first step is the acid-base reaction between the phenolic anion and EG, which forms HO-CH₂-CH₂-O^-, and then CO₂ is attached to the anion HO-CH₂-CH₂-O^- to form a carbonate species.