卤化银的负载及其增强的可见光催化活性机理研究

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1、卤化银的负载及其增强的可见光催化活性机理研究摘要关键词：卤化银；异质结；光催化活性；光催化机理II万方数据卤化银的负载及其增强的可见光催化活性机理研究摘要StudyofthehighlyenhancedvisiblelightphotocatalyticmechanismofAgXcompositesYijieZhao(Physicalchemistry)Abstract:Recently,semiconductorphotocatalytictechnologyasabranchofgreenche

2、mistry,attractedincreasinglyinterestbecauseitprovidesapromisingpathwayforsolvingenvironmentalproblemsandenergyconversion.However,thetraditionalphotocatalyst,forexampleTiO2,hastwodisadvantagesofweakvisiblelightadsotptionabilityandeasyrecombinationofphoto

3、gengeratedchargecarriers.Inordertosolvetheseproblems,itishighlydesirabletodevelopnovelphotocatalyststhatcanyieldhighreactivityundervisiblelight.Inthispaper,todesignandpreparationofAgX/semiconductorcompositesmaterialswithhighphotocatalyticactivityandstea

4、bilityfordegradationoforganicpollouantswerestudied.Themainresearchcontentsandresultsofthisthesisaredividedthreeparts:(1)NovelAg/AgBr/g-C3N4compositephotocatalystswereconstructedviadeposition-precipitationmethodandextensivelycharacterizedbyX-raydiffracti

5、on(XRD),scanningelectronmicroscopy(SEM),high-resolutiontransmissionelectronmicroscopy(HRTEM),andUV-visdiffusereflectancespectroscopy(DRS).Undervisiblelight(λ>420nm),Ag/AgBr/g-C3N4compositephotocatalystsdisplayedmuchhigherphotocatalyticactivitiesthanthos

6、eofAg/AgBrandg-C3N4fordegradationofmethylorange(MO).50%Ag/AgBr/g-C3N4presentedthebestphotocatalyticperformance,whichwasmainlyattributedtothesynergisticeffectsofAgBr/g-C3N4interfaceandtheinsitumetallicAgnanoparticlesforefficientlyseparatingelectron-holep

7、airs.Furthermore,Ag/AgBr/g-C3N4remainedgoodphotocatalyticactivitythrough5timesofcycleexperiments.Additionally,−theradicalscavengersexperimentindicatedthat•O2wasthemainreactivespeciesfortheMOdegradationundervisiblelight.(2)NovelAg/AgI/BiOIcompositeswerec

8、ontrollablysynthesizedviaafacileion-exchangefollowedbyphotoreductionstrategybyusinghierarchicalBiOImicroflowerassubstrate.Theas-preparedAg/AgI/BiOIcompositeswerestudiedbyX-raypowderdiffractometer(XRD),scanningelectronmicroscopy(S