一种biⅴ-o-biⅲ复合物的直接氧化及可见光催化性能分析-direct oxidation of a bi ⅴ - o - bi ⅲ complex and analysis of its visible light photocatalytic properties.docxVIP
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一种biⅴ-o-biⅲ复合物的直接氧化及可见光催化性能分析-direct oxidation of a bi ⅴ - o - bi ⅲ complex and analysis of its visible light photocatalytic properties
AbstractAnewBi(Ⅴ)-O-Bi(Ⅲ)composites(BOCs)waspreparedfromNaBiO3,andthenitsabilitytodealwithdyewastewaterwasstudied.Inthefirstplace,bismuthoxidescomposites(BOCs)withdifferentsurfacecompositionhavebeenpreparedbyafacileaqueousreactionofNaBiO3andhydrochloricacidaqueoussolution.WiththecharacterizationofX-raydiffraction,X-rayphotoelectronspectroscopyandtransmissionelectronmicroscopy,itwasfoundthatBi2O3tendedtobegeneratedatlowHClconcentration(0c(HCl)/c(NaBiO3)0.05)andBiOClwasthedominantsurfacephaseathigherHClconcentration(c(HCl)/c(NaBiO3)2.16).Meanwhile,therelativeproportionofNaBiO3,Bi2O3andBiOClcanberegulatedbycontrollingoftheHCldosage.FortheBOCsdirectoxidationtechnique,RhodamineBwaschoosenasamodelcontaminanttoresearchtheoxidizingabilityofBOCs.20mg/LRhodamineBwasrapidlydecolourizatedwith0.5g/LunheatedBOCsin10min,whichshowedthewelldecolourizationabilityofunheatedBOCs.Thequencherexperimentshowedsingleoxygenistheactivespeciesinthereactionprocess.ThisdecolourizationabilityofBOCsisunstable,whichisinactivatedalongwithhigh-temperatureprocessingandrestingperiod.BOCswithoutheatedcandecolourizeorganicdyerapidlywithoutanyextraenergy,whichshowedasaexcellentpre-processingmethod.Forthevisiblelightphotocatalytictechnique,ThepreparedBOCsshowedbetterphotocatalyticactivityforthedegradationofamodelpollutantrhodamineBundervisiblelightillumination(λ>420nm)comparedwithsingleNaBiO3,Bi2O3orBiOClphotocatalyst.Amongthem,BOCspreparedwiththedosageofHClatc(HCl)/c(NaBiO3)=0.2showedthehighestphotocatalyticactivityduetoaheterojunctionconstructionofNaBiO3/Bi2O3/BiOCl,enhancingadsorptionofvisiblelightandeffectivephoto-excitedh+/e-separation,whichillustratethecoexistofNaBiO3,Bi2O3andBiOClcanenhancedthephotocatalyticabilityofphotocatalysis.KeyWords:BismuthOxides;VisibleLightPhotocatalysis;DirectOxidation;RhodamineB目录摘要.....................................................................................................................................IAbstract...................................................
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