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1、AbstractInthispaper,wedemonstratetheTiO2microspheresviaafacilesolvothermalprocessusingself-fabricatedTiO2precursorandaseriesofTiO2/carbonquantumdots(CQDs)hybridsviaainsituhydrothermalmethodfromagreencarbonsource,glucose.XRD,HRTEM,FTIRandXPSanalysesshowedthatcarbonhasdopedintheas-synthesize
2、dTiO2microsphereswhichledtolocalenergylevelinthebandstructureandavalencebandtailstoabsorbvisiblelight.Moreover,thephotocatalyticactivitiesoftheseproductswereevaluatedbythephotodegradationofRhodamineB(RhB)undervisiblelightirradiation.TheimprovedphotocatalyticactivitieswereobservedfortheTiO2
3、/CQDssamplesundervisiblelightdegradation,inwhichtheTiO2/CQDs-2sampleobtainedwithaglucoseconcentrationof0.02%wtexhibitedthehighestrate.ItwasattributedtotheCQDsactasachargeseparationcenterforimpedingtherecombinationandprolongingthelifetimeofelectronandholepairs,andanabsorptionsiteforthepollu
4、tantmolecules.Keywords:carbonquantumdot(CQD),TiO2microspheres,carbon-doped,photocatalyticactivity.IntroductionInrecentyears，theexpandingorganicenvironmentalpollutionhasbecamethecrucialissuewhichnotonlyinfluencehumanbeing’shealthy,butalsointurnhinderthesocialandeconomicdevelopment.Therefore
5、,severalresearcheshavebeenfocusedonandagreatmountofsemiconductors(suchasTiO2[1],ZnO[2],SnO2[3],ZnS,CdS[4]andMoS2[5])havebeencarriedoutasefficientphotocatalystsinenvironmentalpurificationandenergyconversionduetotheiruniquechemicalandelectronicstructures[6].Amongthosesemiconductors,titaniumo
6、xide(TiO2),n-typewiththebandgapofabout3.2eV,attractsmuchattentionandbecomeoneofthemostpromisingcandidatesfordyedegradationduetoitslow-cost,non-toxicpropertyandchemical-photostability[7-9].Especially,TiO2microsphereswerefabricatedtoimprovephotocatalysisforitsuniformmorphologywithlessagglome
7、rationandlargesurfacearea[10,11].However,thepoorsolarenergyabsorptionandrapidrecombinationofphoto-generatedelectrons(e-)andholes(h+)greatlylimitedtheefficiencyofphotocatalyticactivities[7,9].Therefore,energybandengineeringsuchasdopingwithmental[12]ornonmentale
