Deep eutectic solvents consisting of 1-ethyl-3-methylimidazolium chloride and glycerol derivatives for highly efficient and reversible SO2 capture

Development of eco-friendly materials for the removal of SO2 is a significant topic in sustainable chemical engineering process. In this work, we describe an efficient protocol for highly efficient and reversible SO2 capture by deep eutectic solvents (DESs) consisting of 1-ethyl-3-methylimidazolium chloride (EmimCl) and glycerol derivatives. The presented DESs exhibit an equal or much higher absorption capacity than previously reported DESs or ionic liquids in the same conditions. Particularly, EmimCl-glycerol (molar ratio 2:1) shows excellent reversible absorption through physical interactions supporting by FTIR and NMR spectroscopic experiments, thus presenting good potential as a candidate absorbent for the removal of SO2. (C) 2020 Published by Elsevier B.V.