摘要：1 -butyl-3 -methylimidazolium chloride([Bmim]Cl) was synthesized by ultrasonic heating circumfluence method and used as the intermediate for preparing Fe-based ionic liquids (Fe-ILs). By introducing the ultrasonic oscillation, the structure of[Bmim]Cl was unaffected but the reaction was shortened, achieving a good yield. The prepared [Bmim]Cl was mixed with FeCl3'6H2〇 at different mole ratios to synthesize Fe-ILs. The characteristic results showed that Fe-ILs have excellent thermal stability and FeCl4- is the principal anion in Fe-ILs. A ternary desulfurization solution consisted of prepared Fe-ILs, water, and ethanol was applied for the flue gas desulfurization. Different compositions of desulfurization solution have great effects on the desulfurization efficiency and water is an indispensable component for S〇2 removal. Fe-ILs with different mole ratios of [Bmim]Cl to FeCl3'6H2〇 exhibit different SO2 removal activities. When the mass ratio of Fe-ILs, water, and ethanol is at 1:2:4, Fe-IL1 has the highest S〇2 adsorption capacity of 69.35 mg/g while Fe-IL3 has the maximum SO42" conversion rate of 42.3%, indicating that the prepared Fe-ILs have dual functions of adsorbent and catalyst and are able to catalytically oxidize SO2 to form H2SO4 in the presence of O2 and H2O.
