凹凸棒负载TiO2对偶氮染料和纺织废水光催化脱污胡春

　:0253-2468(2001)-01-0123-03　　　:O643.36　　　:ATiO2胡　春,王怡中　(,,　100085):,P25TiO2..5.,,.:TiO2/;;;TiO2/attapulgitephotocatalystforsolardetoxificationofazodyesandtextilewastewaterHuChun,WangYizhong　(SKLEAC,ResearchCenterforEco-EnvironmentalSciences,ChineseAcademyofSciences,Bei-jing100085.E-mail:[e-mail])Abstract:AsolardecontaminationprocessforwaterwasdevelopedusingTiO2photocatalystssupportedonattapulgite.Thesupportedcatalystwassystematicallyoptimizedwithrespecttocatalystdosageandcalcinationtemperature.Methylorangeetc.azodyesandwooltextilewastewaterweredecolorizedundersolarilluminationusingoptimalsupportedcatalyst.Theresultsindicatesthatthiskindofsupportedcatalystilluminatedbysolarisveryeffectivetodestroythemostrefractorycompounds.anddisplayedhighstabilityforcirculationuse.Keywords:supportattapulgite;supportedTiO2;solar;photooxidation;azodyes;textilewastewater:1999-10-10;:2000-03-21:(No.29637010,No.59878051,No.20007004):　(1966—),,.[1,2]..[3].,.Legrini[4][5].TiO2.1　1.1　DegussaP25,50m2/g,30nm,.,700℃6h,(7.3kgf),70—80m2/g.(2—4mm),600℃6h.1.2,30cm×20cm,4cm.,21120011　　　　　ACTASCIENTIAECIRCUMSTANTIAEVol.21,No.1Jan.,2001DOI:10.13671/j.hjkxxb.2001.01.02550mL,.1000mL,10ppm,,,.TiO2/120g..COLEPARMA.TOC-10B(Shimadzu).(COD).(300-400nm)UV(ModelUV-A)().2　1　TiO2/SEMFig.1　ScanningelectronmicrographsofTiO2coated/uncoatedattapulgite(A)uncoated(B)coated2.1　TiO21TiO2,2%4%()TiO2/,8%TiO2/TiO2,TiO2,TiO2,.TiO2,.12%TiO2/TiO2,.2TiO2.,2%TiO2/.2　TiO2300mL/min;10ppm;1000mL;13.57W/m2;1998-3-24,9:40am-2:40pmFig.2　MethylorangedegradationrateconstantsforvariousdosagesofTiO2onsupportattapulgite(2-4mm)reaction.1　TiO2/(BET)TiO2Table1　Thespecificsurfaceareas(BET)andporesizeofTiO2/attapulgiteatvariousTiO2dosageTiO2%0248TiO2BET,m2/g63.48765.62468.32654.20650,nm14.7415.7014.9917.27-2.2　.32%TiO2/600℃.,,.,,.630℃.600℃,.2.3　2%TiO2/21d,.6.67%,,.65h,,,.2.4　124　　　　　　　　　　213　280—300mL/min;20ppm;1000mL;16.34W/m2;1998-04-06,10:00am—3:00pmFig.3　Thereactionrateconstantsofmethylor-angeforthecatalystcalcinationtempera-tureTiO2,.5ppm,600mL,,2h,90%.,COD44g/L,1000mL,1h,;4h,CODTOC69%、63%.,21.23W/m2.2..2　TiO2/,Table2　TypicaldataofsolarphotodegradationofazodyesandtextilewastewateronTiO2-supportedattulgilte,W/m2,h,%K-2G24.68291.59KD-3G11.07294.56K-2BP18.23290.57X-GRL33.26297.8118.23283.830.681952.5　,Langmuir-Hinshelwood(L-H):1/r0=(1/kK)·(1/C0)+1/k.,k,K.,k=1.2866mg/(L·min),K=0.0838L/mg.,:Υλ1-λ2=M1M2(2),M1,,M2,[4],λ1300nm,λ2400nm,.(2)23.2W/m2、9.59W/m2,:2.01%、0.83%..:[1]　OllisDF,PelizzettiE,SerponeN.Destructionofwatercontaminants[J].EnvirSciTechnol,1991,25:1523—1529.[2]　RinucciL,BorgarelloE,MineroC,etal.TreatmentofindustrialwastewatesbyphotocatalyticoxidationonTiO2[A].Proceedingsofthe1stInternationalConferenceonTiO2PhotocatalyticPurificationandTreatmentofWaterandAir[C].Ontario,Canada,8-13November1992.1993.585—594[3]　KormannC,BahnemannDW,HoffmanMR.Preparationandcharacterizationofquantum—sizetitaniumdioxide[J].JPhysChem,1988,92:5196—520[4]　LegriniE,OliverosE,BraunAM.Photochemicalprocessesforwatertreatment[J].ChemRev,1993,93:671.[5]　ZhangY,CrittendenJC,HandDW,etal.Fixed-Bedphotocatalystsfprsolardecomtaminationofwater[J].EnvironSciTechnol,1994,28:435—4421251　:TiO2