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1、MaterialsResearchBulletin48(2013)672–681ContentslistsavailableatSciVerseScienceDirectMaterialsResearchBulletinjournalhomepage:www.elsevier.com/locate/matresbuUltrasonicsynthesisandphotocatalyticperformanceofmetal-ionsdopedTiO2catalystsundersolarlightirradiationHuajunFeng*,LiyaE.Y
2、u,Min-HongZhangDepartmentofCivilandEnvironmentalEngineering,NationalUniversityofSingapore,1EngineeringDrive2,Singapore117576,SingaporeARTICLEINFOABSTRACTArticlehistory:Eightmetal-ionsdopedTiO2(M-TiO2)weresuccessfullysynthesizedbyanultrasonicmethod,includingReceived3March2012shows
3、Fe,Co,Ce,Cr,Mn,Mg,NiandAgions.Amongthem,the1%Mg–TiO2thehighestphotocatalyticReceivedinrevisedform11September2012efficiencyAcceptedundersolarlight,whichwasdeterminedbydegradingrhodamineB(RhB)moleculesinan6November2012aqueousAvailablesolution.ThesynthesizedM-TiO2sampleswerecharacter
4、izedbyXRD,BETSurfacearea,TEM,online16November2012XPSanddiffusereflectancespectrum.EffectsofsynthesisconditionsandcharacterizedpropertiesonphotocatalyticefficiencyoftheM-TiO2wereinvestigatedcomprehensively.ApositivecorrelationKeywords:betweenspecificsurfaceareaandphotocatalyticefficie
5、ncyoftheM-TiO2wasfoundacrossdifferentA.Compositessynthesisconditions.However,noclearcorrelationwithphotocatalyticefficiencywasobservedforA.OxidesB.crystalstructureandradiiofdopingionsoftheM-TiO2.XPSstudyindicatesthechangeofoxidationChemicalsynthesisstates2+3+D.ofMnionsinMn–TiO2dur
6、ingsynthesisprocedurefromtheinitialMntoamixtureofMnandCatalyticproperties4+Mnions.DyesensitizationmechanismwasobservedduringthephotocatalyticprocedureoftheMg–TiO2,whichenhancedthedegradationefficiencyoftheMg–TiO2undersolarlight.Finally,noobviouslossofphotocatalyticactivitywasobser
7、vedfortheMg–TiO2afterfivecyclesofRhBdegradation.ß2012ElsevierLtd.Allrightsreserved.1.Introductionconflictingresultsindicatethatnarrowband-gapwidthintroducedbymetaldopantsisnottheonlyfactoraffectingphotocatalyticTitania(TiO2)hasbeenextensivelystudiedduringlastdecadesefficiency.Otherf
8、actorssuchasspecificsurfacearea,crystalfo
