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SO2 absorption in pure ionic liquids Solubility and functionalization

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ContentslistsavailableatScienceDirectJournalofHazardousMaterialsjournalhomepage:www.elsevier.com/locate/jhazmatReviewSO2absorptioninpureionicliquids:SolubilityandfunctionalizationLanyunWanga,b,c,YajuanZhanga,YangLiua,HuilongXiea,YongliangXua,b,c,*,JianpingWeia,b,c,*aSchoolofSafetyScienceandEngineering,HenanPolytechnicUniversity,Jiaozuo,454003,ChinabCollaborativeInnovationCenterofCoalSafetyProductionofHenanProvince,Jiaozuo,454003,ChinacStateKeyLaboratoryCultivationBaseforGasGeologyandGasControlinHenanPolytechnicUniversity,Jiaozuo,454003,ChinaGRAPHICALABSTRACTARTICLEINFOEditor:DeyiHouKeywords:SO2solubilityIonicliquidsFunctionalityAbsorptionmechanismsSO2/CO2selectivityABSTRACTTheSO2solubilityinionicliquidsandabsorptionmechanismswithdifferentfunctionalities,includingether,halide,carboxylate,dicarboxylate,thiocynate,phenol,amino,azolegroups,etc.,arepresentedinthisreview.StrategiesofimprovingSO2capturewithlowbindingenergyandtheseparationperformancefromCO2arealsoconcluded.Generally,moderatebasicityisfavourableforenhancingSO2capacityandthewater(below6wt%)effectonabsorptionisindefinitebutgenerallyslight.Introducingelectron-withdrawingsubstituentssuchasnitrile,halogen,aldehydeandcarboxylicgroupsareproposedtodecreasethechemicalabsorptionenthalpybetweenionicliquidandSO2inordertoreduceregenerationpowerconsumption.Althoughitispromising,theabsorptionenthalpyisstillmuchhigherthanthephysisorptionperformanceespeciallyoftheether-functiona-lizedones.Thebiocompatiblecholine-based,betaine-based,a

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