二氧化鈦表面雜多酸和氟離子修飾對吸附和光催化降解有機物的影響.pdf

1、浙江大學理學院博士學位論文二氧化鈦表面雜多酸和氟離子修飾對吸附和光催化降解有機物的影響姓名：呂康樂申請學位級別：博士專業(yè)：無機化學指導教師：許宜銘20060601AbstractAdsorptionandPhotocatalytieDegradationofOrganicPollutantsinPOM—andFluorideModifiedTiOzSuspensionsAbstractPhotocatalytictechnologyba

2、sedonTi02hasprovidedaneffectiveandpromisingmeansfortheremediationofenvironmentalpollutantsinairandwaterHoweveravitalproblem，ie，lowquantumefficiency(4％)，hampereditswidespreadpracticalapplicationsOneeffortoftheresearchinth

3、isfieldistomodifythesurfacepropertiesofTi02particlesInthis“thesis，theadsorptionandphotocatalyticdegradationoforganicpollutants，anonicdyeX3Bandphenol，inanaeratedaqueoussuspensionsofpolyoxometalateandfluoridemodified“ri02u

4、nderUVlightwereinvestigated，ThethesisconsistsofthreesectionsasfollowsSectionldealswiththecriticalimpactofadsorptionontherateoforganicdegradationbyTie2photocatalysisThephotocatalyticdegradation(PCDloforganiccontaminantinw

5、ateroversupportedorunsupportedTie2isgenerallymonitoredbytheconcentrationchangeoftargetorganicsintheliquidphaseInthiswork，weshowthatsuchapparentinitialrateofPCDismuchsmallerthanthetotalinitialrateofPCD，determinedbytotallo

6、ssofX3B，ananionicazodye，bothfromthesolutionandontheTiOzsurfaceForasafetyreason，suchfactorofadsorptionshouldbeconsideredintotheroutineassessmentabouttherelativephotoactivityamongdifferenthighlysorptivecatalysts，andaboutth

7、ekineticanalysisaswellSectionIIhasexaminedtheeffectsofpolyoxometalateandfluorideonadsorptionandphotocatalyticdegradationofX3BonTi02IthasbeenreportedthatadditionofpolyoxometalatesfPOM)orfluorideanionsintotheTi02dispersion

8、scansignificantlyenhancethepbotocatalyticdegradationofweaklyadsorptiveorganicpollutantsinwaterHoweverweobservedthatthedegradationrateofX3BwassignificantlydecreasedinthepresenceofPOM，whereastheratewasgreatlyincreasedinthe

9、presenceoffluorideItwasnotedthattheadsorptionofX3BonTiOzwasmarkedlydecreasedinthepresenceofeitherPOMorfluorideItisproposedthatthesurfaceoccupationofPOMonTi02acceleratestheproductionofsurfacebound‘OHradicals，whereastheflu

10、oridereplacementofsurfacehydroxylgroupsofTi02increasestheproductionoffreehydroxylradicalsinsolution，Itisalsosuggestedthatthereactivespeciesfollowingtherelativeorderoffreehydroxylradicalssubsurfaceholessurface—boundhydrox

11、ylradicalsSection111hasmadeadeepinvestigationintotheeffectoffluorideonthephotocatalyticdegradationofphenoloffTi02preparedunderdifferentconditionsItwasfoundthatthepresenceoffluorideonlyenhancedthedegradationofphenolonTj02

12、withanatasephase，whileitretardedthephenoldegradationonTi02withpurerutilephaseTheintermediatesofphenoldegradationwereinvestigatedandthereactionmechanismwasalsodiscussedKeywords：adsorption，photocatalysis，polyoxometalate，fl