Effect of Preparation Conditions on Visible Photocatalytic Activity of Titania Synthesized by Solution Combustion Method.pdf

维普资讯 Chin．J．Chem．Eng．，15(2)178— 183(2007) EffectofPreparationConditionsonVisiblePhotocatalyticActivityof TitaniaSynthesizedbySolutionCombustionM ethod CHENGYouping(程友萍)，SUNHongqi(~J、红旗)，JINWanqin(金万勤) and XUNanping(徐南平) MembraneSciencenadTechnologyResearchCenter,Nanjingunivers ofTechnology,Nanjing210009，China 1 INTRoDUCTIoN titaniaisprepraedbyhteliquidphasereactionroute． Semiconductor．．based photocatalysis is an ad．． Thecrystallinity,surfaceraeaand surfacepropertyof vanced technology forremovaloforganicand inor- titania，whichpossiblyplayna importantroleinphoto— ganicpollutantsinairorsolution[1]．Manystudies catalyticactivity,raechna gedwiht varyingcalcination havebeen ofcusedon TiO，becauseofitshigheffi． time．Th erefore，deepsutdiesofhteeffectofprepara- ciency,Iong—timephotostabilitynadlowcost[2]．Ti02 tionconditionsonphotocatalyticactivityraenecessary． isthemostwidelyusedphotocatalystinpracticalaD— Theobiectiveofthisstudyistoinvestigatethe plications such as self-cleaning window pnaesna d effectofprepraationconditionson visiblephotocata— Palnts[3]．However,itisactivatedonlyintheUVre— lyticactivityofrphotodegradation of4一chlorophenol gion(~387nm)becauseofitsIargebnadg印ofabout f4一CP1usingthecatalystssynhtesizedbvSCM ．The 3．2eV The costand inaccessibility ofUV photons 4．CPwasselectedbecauseitislistedma ongtoppri— makeitdesirabletodevelopphotocatalysts，whichare oritypollutnats，andcomm onlyknownasatoxicand activeundervisible—lightexcitation using the solra nonbiodegradableorganiccompound．Itisalsowidely spectrum．M anyattemptshavebeenmadetoshifthte used ofr theproduction ofdyes，drugs，and fungi— TiO，absorptionfrom theultraviolettothevisiblere．