| The global economic rapid development cause consumption of large quantities offossil fuels, then lead to sulfur dioxide (SO2) as one of the most significant sources ofatmospheric pollution, which is mainly emitted from fossil fuel burning, and hasdrawn much more attention due to formation of acid rain and smog that threaten theenvironment and human health. To capture SO2from the flue gas can not onlyeliminate pollution to the environmental, but also reduce the use of non-renewablemineral resources and achieve efficient usage as SO2is an important and usefulchemical intermediates in industry.The majority of SO2emissions from the coal-based power plants and other largeenterprises in our country, so control of SO2emissions from the source (I.e. industrialflue gas desulfurization/FGD) had become an effective way. The conventionaltechnologies to remove SO2, such as limestone, ammonia and organic solventabsorption processes, have been commercially widely adopted. However, they alwayshave the disadvantages of low desulfurization efficiency, high operation cost,difficulty in SO2recovery and causing annoying secondary pollution.Ionic liquids (ILs), cherished with many novel properties, such as negligiblevapor pressure, tunable structure, high thermal and chemical stability are consideredas a kind of novel material for SO2capture with high absorption efficiency. However,owing to high viscosity and difficulty in recycle of the ILs, their large-scaleapplication on SO2adsorption is limited. To solve those problems, this study usedSBA-15as carrier, as its large specific surface area, orderly and stable pore structure.This method combined advantages of ionic liquids and molecular sieve carrier tocapture SO2effectively and reversibly.In this paper, a novel class of dual-siloxane ionic liquids were designed andsynthesized, and the ILs were characterized by MS and FT-IR, the result shown thatits yield more than95%. and immobilize this ionic liquid into SBA-15by sol-gelmethod to obtain a series of organic-inorganic hybrid material, the materials was confirmed with SXRD, FT-IR, BET, TG, TEM and Elemental analysis, all the resultswere shown that the material with good thermal stability. The breakthrough curvesresults shown that hybrid material had excellent SO2adsorption performance, theabsorption capacity was35.99mL/g ILs@SBA-15, and the SO2absorption capacityshowed a decreasing trend after the first increase as the percentage of ionic liquid inhybrid materials increased. Further, the SO2desorption by simple heated in an inertatmosphere and the materials reuse10times without significant loss of adsorptioncapacity, with the absorption capacity of33.77mL/g ILs@SBA-15, and showed theexcellent cycling performance. Therefore, the study can provide a consultation forresearch in immobilization of ionic liquids and the environmental air pollutioncontrol. |
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