%0 Journal Article
%T LEDIrradiationofaPhotocatalystforBenzene,Toluene,EthylBenzene,andXyleneDecomposition
%A JO Wan-Kuen
%A KANG Hyun-Jung
%J ´ß»¯Ñ§±¨
%P 1672-1680
%D 2012
%R 10.1016/S1872-2067(11)60446-4
%X £¿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.
%K lightemittingdiode
%K energyefficiency
%K gasphasedegradation
%K photocatalystcharacterization
%K calcinationtemperature
%U http://www.chxb.cn/CN/abstract/abstract20816.shtml