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1、Chenetal.NanoscaleResearchLetters(2016)11:60DOI10.1186/s11671-016-1262-7NANOEXPRESSOpenAccessEnhancedPhotocatalyticActivityoftheCarbonQuantumDot-ModifiedBiOIMicrosphere1,211,21,311*11YuanChen,QiujuLu,XuelianYan,QionghuaMo,YunChen,BitaoLiu,LiumeiTeng,WeiXiao,14LiangshengGeandQinyiWangAbstract
2、Novelcarbonquantumdot(CQD)-modifiedBiOIphotocatalystswerepreparedviaafacilehydrothermalprocess.TheCQD-modifiedBiOImaterialswerecharacterizedbymultipletechniques.TheCQDwithanaveragesizearoundseveralnanometerswasdistributedonthesurfaceofBiOImicrosphere.Itsphotocatalyticactivitywasinvestigateds
3、ufficientlybythephotodegradationofmethyleneorange(MO).TheresultsshowedthattheCQD/BiOI1.5wt.%sampleexhibitedtheoptimumphotocatalyticactivity,whichwas2.5timesthatofthepureBiOI.ThisimprovementwasattributedtothecrucialroleofCQDs,whichcouldbeactedasaphotocenterforabsorbingsolarlight,chargeseparat
4、ioncenterforsuppressingchargerecombination.Keywords:BiOI,CQDs,Photocatalytic,VisiblelightBackgroundCQD-basedcomposites[7,8].PreviousstudieshaveshownTheexplorationandconstructionofnewphotocatalyststhattheelectron-acceptingandtransportpropertiesofcar-withhighcatalyticefficiencyinsunlightisacor
5、eissueinbonnanomaterialsprovideaconvenientwaytoseparatephotocatalysisallthetimeandisalsosignificantinsolv-photogeneratedelectrons;thus,enhancedphotocatalyticingcurrentenvironmentandenergyproblems[1–3].performancecanbeachievedthroughtheconstructionRecently,bismuthoxyhalides(BiOX,X=Cl,Br,andI)
6、asofsemiconductor/carboncomposites[9,10].Notably,anovelternaryoxidesemiconductorhavedrawnmuchthedesignofcomplexphotocatalysts(TiO2/CQDs,attentionbecauseoftheirpotentialapplicationinphoto-Ag3PO4/CQDs,Bi2MoO6/CQDs)toutilizemoresun-catalysis.Amongthem,BiOIisphotochemicallystablelighthasbeenrepo
7、rted[11–13].Consideringsuchre-andhasthesmallestbandgap(about1.7–1.9eV),whichmarkablepropertiesofCQDsandthelimitationsofthecanbeactivatedbyvisiblelightirradiation[4–6].How-BiOIphotocatalyticsystem,thecombinationofCQDsever,thenarrowbandgapcouldalsole
