MoO-3改性的TiO-2在可见光下催化降解亚甲基蓝

ChineseJournalofCatalysis35(2014)140–147催化学报2014年第35卷第1期|www.chxb.cnavailableatwww.sciencedirect.comjournalhomepage:www.elsevier.com/locate/chnjcArticlePhotocatalyticdegradationofmethylenebluebyMoO3modifiedTiO2undervisiblelightHuaboYanga,XiangLia,b,*,AnjieWanga,b,YaoWangb,YongyingChenbaStateKeyLaboratoryofFineChemicals,SchoolofChemicalEngineering,DalianUniversityofTechnology,Dalian116024,Liaoning,ChinabLiaoningKeyLaboratoryofPetrochemicalTechnologyandEquipments,Dalian116024,Liaoning,ChinaARTICLEINFOABSTRACTArticlehistory:Received14July2013Accepted9October2013Published20January2014MoO3/P25catalystswerepreparedbyanimpregnationmethod.ThecatalystswerecharacterizedbyX‐raydiffraction,ultraviolet‐visiblespectrophotometry,Fouriertransforminfraredspectrosco‐py,andlaserRamanspectroscopy,andtheirphotocatalyticactivtywasevaluatedbythedegrada‐tionofmethylenebluedyeundervisiblelight.ThemonolayerdispersionthresholdofMoO3onP25wasaround0.1g/g.Thestronginteractionbetweenthemonolayer‐dispersedtetrahedral‐coordi‐natedmolybdenumoxidespeciesandP25ledtoadecreaseinthebandgapofP25,thusincreasingthevisiblelightabsorptionofthecatalyst.CrystallineMoO3wasformedoncatalystswithaMoO3/P25massratioabove0.1.Inthesecases,thevisiblelightabsorptionofthecatalystsde‐creasedwithincreasingMoO3content.Thebandgapofthecatalystwasnottheonlyfactoraffectingitsphotocatalyticactivityforthedegradationofmethyleneblueundervisiblelight.MoO3/P25withtheMoO3toP25massratioof0.25,whichpossessednotonlysuitablebandgapbutalsoacertainamountofcrystallineMoO3,showedthebestcatalyticperformance.©2014,DalianInstituteofChemicalPhysics,ChineseAcademyofSciences.PublishedbyElsevierB.V.Allrightsreserved.Keywords:TitaniaMolybdenumoxideIncipientimpregnationMethyleneblueVisiblelight1.IntroductionTiO2isthemostfrequentlyusedphotocatalystduetoitslowcost,highstability,andhighphotocatalyticoxidationactivity.InthepresenceofTiO2,mostorganicpollutantscanbephoto‐catalyticallydegradedandmineralizedtoCO2,H2O,andothersmallinorganicmolecules.However,TiO