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催化学报  2012 

LEDIrradiationofaPhotocatalystforBenzene,Toluene,EthylBenzene,andXyleneDecomposition

DOI: 10.1016/S1872-2067(11)60446-4, PP. 1672-1680

Keywords: lightemittingdiode,energyefficiency,gasphasedegradation,photocatalystcharacterization,calcinationtemperature

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Abstract:

？Studiesontheuseofgasphaseapplicationsoflightemittingdiodes(LEDs)inphotocatalysisarescarcealthoughtheirphotocatalyticdecompositionkineticsofenvironmentalpollutantsarelikelydifferentfromthoseinaqueoussolutions.ThepresentstudyevaluatedtheuseofchipsofvisiblelightLEDstoirradiatenitrogendopedtitania(N-TiO2)preparedbyhydrolysistodecomposegaseousbenzene,toluene,ethylbenzene,m-xylene,p-xylene,ando-xylene.Photocatalystscalcinedatdifferenttemperatureswerecharacterizedbyvariousanalyticalinstruments.Thedegradationefficiencyofbenzenewasclosetozeroforallconditions.Fortheothercompounds,aconventional8Wdaylightlamp/N-TiO2unitgaveahigherphotocatalyticdegradationefficiencyascomparedwiththatofvisible-LED/N-TiO2units.However,theratiosofdegradationefficiencytoelectricpowerconsumptionwerehigherforthephotocatalyticunitsthatusedtwotypesofvisible-LEDlamps(blueandwhiteLEDs).Thehighestdegradationefficiencywasobservedwiththeuseofacalcinationtemperatureof350oC.Theaveragedegradationefficienciesfortoluene,ethylbenzene,m-xylene,p-xylene,ando-xylenewere35%,68%,94%,and93%,respectively.Theuseofblue-andwhite-LEDs,highlightintensity,andlowinitialconcentrationsgavehighphotocatalyticactivitiesforthephotocatalyticunitsusingvisible-LEDs.Themorphologicalandopticalpropertiesofthephotocatalystswerecorrelatedtoexplainthedependenceofphotocatalyticactivityoncalcinationtemperature.Theresultssuggestthatvisible-LEDsareenergyefficientlightsourceforphotocatalyticgasphaseapplications,buttheactivitydependsontheoperationalconditions.

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