Controllable One-Pot Synthesis and Enhanced Visible Light Photocatalytic Activity of.pdf

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1、940J.Phys.Chem.C2010,114,940–946ControllableOne-PotSynthesisandEnhancedVisibleLightPhotocatalyticActivityofTunableC-Cl-CodopedTiO2NanocrystalswithHighSurfaceAreaHuaXuandLizhiZhang*KeyLaboratoryofPesticideandChemicalBiologyoftheMinistryofEducation,Coll

2、egeofChemistry,CentralChinaNormalUniVersity,Wuhan430079,People’sRepublicofChinaReceiVed:October15,2009;ReVisedManuscriptReceiVed:NoVember20,2009WedemonstratethecontrolledsynthesisofC-Cl-codopedanataseTiO2nanocrystalsbyhydrolysisoftitaniumtetraisopropo

3、xide(TTIP)inchloroformcontainingtraceamountsofwateratalowtemperatureof150°Cwithoutsubsequentthermalprocedure.TheCandCldopantsresultedfromthesolvothermaldecompositionofchloroforminducedbywater,andtheadjustingofmolarratiosofwatertoTTIPwasabletotunethecr

4、ystalsizesandtheconcentrationofthedopants.Theas-preparedpowderswerecharacterizedbyX-raydiffraction(XRD),transmissionelectronmicroscopy(TEM),high-resolutionTEM(HRTEM),nitrogenadsorption,X-rayphotoelectronspectroscopy(XPS),andUV-visdiffusereflectancespec

5、troscopy(DRS).AlltheC-Cl-codopedTiO2possessedmesoporousstructureandhighsurfaceareasbetween158.1and469.6m2/g.ThephotocatalyticactivitiesoftheresultingC-Cl-codopedTiOnanocrystalswereevaluatedbythe2photodegradationofRhBundervisiblelightirradiation.Thesam

6、plesynthesizedwithamolarratioofwatertoTTIPequalto2exhibitedthehighestphotoactivityamongallthesynthesizedC-Cl-codopedTiO2.ItsactivitywasevenmuchhigherthanthatoftheC-TiO2andCl-TiO2reportedinourpreviouswork.Theenhancedvisiblelightphotocatalyitcactivityof

7、thatC-Cl-codopedTiO2nanocrystalcouldbeprimarilyattributedtothelargesurfaceareaandthesynergeticeffectofthecodoping.1.IntroductioncodopedTiO2couldsignificantlyimprovethephotoactivity.Theoreticalinvestigationsprovidedetailedmicroscopicinforma-Nanocrystall

8、inetitaniumdioxide(TiO2)hasbeenstudiedastionontheelectronicstructureofthesystemandshowthatapromisingphotocatalystforseveraldecadesbecauseofitspotentialsynergisticeffectsexistedinthe“goodpair”ofapplicationforsolarenergyconversionandorganicconta