Functional ionic liquids for carbon dioxide capture and separation

Carbon dioxide capture and separation (CCS) is one of the main strategies to reduce carbon emissions and cope with global climate change. It is of great significance to develop highly selective absorbents and new routes to efficiently absorb and separate CO2. Recently, ionic liquids (ILs), especially functional ionic liquids, have been developed as a kind of representative material in the last 20 years due to their unique properties, such as ultra low vapor pressure, wide liquid temperature range, high thermal and chemical stability, wide electrochemical steady window, non-flammability, and tunable structure and properties. Thus, many attentions have been drawn on the absorption and separation of CO2 by using ILs. The current review focuses on the studies on functional ILs for CO2 capture and separation during the last five years (2015-2019), including recent progress on the applications of single site functional ILs, multiple sites functional ILs, functional IL-based mixtures, and functional IL-based hybrid materials in CCS. Finally, the challenges in the absorption and separation of CO2 from flue gas as well as further researches in this field have been discussed. © All Right Reserved.