A novel hydrophilic amino acid ionic liquid [C2OHmim][Gly] as aqueous sorbent for CO2 capture

Since functionalized ionic liquid (ILs) could achieve excellent performance on CO2 capture by introducing suitable moieties in the conventional ionic liquids, design and synthesis of new ionic liquids have been attracting remarkable interests. In this work, we designed a novel hydrophilic amino acid ionic liquid ([C(2)OHmim][Gly]) that was functionalized based on the imidazolium ionic liquid with glycine anions and hydroxy group for CO2 absorption. The absorption capacity of [C(2)OHmim][Gly] was 0.575 mol CO2/mol absorbent that was similar to the equimolar stoichiometry following the zwitterion mechanism. Simple synthesis, large absorption capacity, good resistance to O-2, and high regeneration efficiency make this functionalized Its great potential for making up the deficiencies of aqueous MEA, therefore benefiting industrial applications. (C) 2015 Elsevier Ltd. All rights reserved.