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微波辅助光催化降解典型三苯甲烷染料机理研究.docx

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微波辅助光催化降解典型三苯甲烷染料机理研究 Abstract: Thedegradationoftypicaltriphenylmethanedyeswasstudiedwiththeassistanceofmicrowave-assistedphotocatalysis.Theexperimentalresultsshowedthatthecombinationofmicrowaveandphotocatalysiscouldsignificantlyimprovethedegradationefficiencyofdyes.Throughtheanalysisofthedegradationproducts,itwasfoundthatthedegradationmechanismwasmainlytheoxidationandcleavageoftheC-Cbondsinthetriphenylmethanestructure. Introduction： Withtherapiddevelopmentofvariousindustries,dyepollutionhasbecomeasevereenvironmentalproblem.Triphenylmethanedyesarewidelyusedinthetextile,papermaking,andprintinganddyeingindustriesbecauseoftheirbrightcolors,highstability,andlowcost.However,thesedyesarenoteasytodegradeandmaycauseenvironmentalpollution,especiallywhendischargedintowaterbodies.Therefore,thedevelopmentofanefficientandenvironmentallyfriendlydegradationtechnologyforthesedyesisofgreatsignificance. Currently,themostcommonlyusedmethodsforthedegradationofdyesarephysical,chemical,andbiologicalmethods.Amongthem,photocatalysishasattractedwidespreadattentionbecauseofitsadvantages,suchaslowcost,nosecondarypollution,andhighdegradationefficiency.However,photocatalysisalonehascertainlimitationsindegradingsomedifficult-to-degradedyes.Therefore,thecombinationofphotocatalysiswithothertechnologieshasbecomearesearchhotspot. Microwavetechnologyhasbeenwidelyusedinchemicalsynthesis,extraction,andotherfieldsbecauseofitsfast,selective,andenergy-savingcharacteristics.Inrecentyears,microwave-assistedphotocatalysishasbeenwidelyusedinthedegradationofdyesandotherorganicpollutants,andremarkableresultshavebeenachieved. Inthisstudy,typicaltriphenylmethanedyes,suchasmalachitegreen(MG),crystalviolet(CV),andbasicfuchsin(BF),wereselectedastheresearchobjects.Thedegradationefficiencyofdyesunderdifferentconditionswasinvestigated,andthedegradationmechanismofthedyeswasanalyzed. Experimental: TheexperimentalsetupisshowninFigure1.Thereactionvesselwasaquartzglasstubewithadiameterof2cmandalengthof25cm.A125Whigh-pressur