“…In recent decades, ILs as innovative solvents have been widely reported in a variety of industry applications, including electrochemistry, 55–57 catalysis, 58,59 separation (including the separation of hazardous gases, and extraction separation 60,61 ), as well as medium and catalysts for many organic reactions. 62,63 ILs are entirely made up of organic cations, inorganic or organic anions, 64,65 which provide them with unique physicochemical properties 66,67 of wide liquid range, extremely low vapor pressure compared to aqueous and acidic solutions, high thermal and chemical stability, excellent solubility for polar, non-polar organic and inorganic substances than other adsorption material, and chemical structure designability for ILs with different types of anions and cations to change the acidity, alkalinity, polarity and other properties. Thus, ILs are prospective and valuable green absorbents for the separation and purification of industrial exhaust gases (the acidic SO 2 , 68–70 CO 2 , 71–73 H 2 S, 74–76 and neutral CH 4 77,78 ).…”