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TNT1,1,1,TarasovVV2(1.,100081;2.,125190):,,TNT,,TNT6h,TNT,TNT90%TNT,TNT:;TNT;;;;:TQ564;X788:A:100727812(2005)0420005204PhotocatalyticOxidationKineticsofWasteWaterwithTNTandOrganicDyesZHANGDong2xiang1,ZHANGLing2yun1,LIHan2sheng1,TarasovVV2(1.SchoolofChemicalEngineeringandtheEnvironment,BeijingInstituteofTechnology,Beijing100081,China;2.DepartmentofIndustrialEcology,D.I.MendeleevUniversityofChemicalTechnologyofRussia,Moscow125190,Russia)Abstract:TheperformanceandkineticsofdecompositionofTNTandorganicdyesinindustrialwastewaterincirculatingslurryphotocatalyticreactorsbyemployingthephotocatalyticoxidationisinvestigated.Basedontheformationanddiffusionofhydroxylradicals,andtheirreactionwithorganicdyesorTNTmolecules,thekineticsmodelforphotocatalyticoxidationofTNTandorganicdyeisestablished.TheresultsshowthatorganicdyesandTNTcanbeeffectivelydecomposedbythephotocatalyticoxidation.RemovalpercentageofTNTwithdifferentinitialconcentrationscanreachabove90%at6hours.TheresultsforkineticsofthephotocatalyticoxidationofTNTwithdifferentinitialconcentrationsanddifferentorganicdyesshowthatthephotocatalyticdegradationratefollowspseudo2firstorderkineticmodel.ThephotocatalyticoxidationofTNTandorganicdyescanalsobedescribedbythekineticsmodelproposed.Keywords:physicalchemistry;TNT;organicdye;photocatalyticoxidation;kinetics;wastewater,[1],TNT,TNT,[2](O3)(H2O2)TNT,[3],,TNTTNT,,,[4],,,,,[526]:2005206228:(20476010);(200305B05):(1965-),,,,5284200511ChineseJournalofExplosives&Propellants,CO2,H2O,PO43-,SO42-,NO3-,,,[7],,[8]TNT,,,TNT1TNT,H2Ohv(OH3)ph+H3(1)D+OH3P(2)rch=k(COH3CD)(3):rch,molm-3s-1;k(2),cm3mol-1s-1;COH3OH3;CDTNTD,molöm3;POH3:rdif=Ba[(COH3)ph)-(COH3)b](4):(COH3)ph,(COH3)b;B,cmös;aOH3(söv),m-1;S,m2;V;rdifrch,molcm-3s-1,rch=rdif=r,r=dCDödt=k(COH3)ph(CD)[1+k(CD)öBa]-1(5)(5):r=rmaxö(1+F)(6)F=k(CD)öBa(7)F,,,F0;rmaxFn1,(5),r=rmax,Fm1,,OH30,,F1,,,(1)(2),(1)(2),,OH3,W=DdöDph()OH3Wm1,OH3,OH3OH3Wm1Fn1,(2)22.1:(DegussaP25):,,;,,;,;2,4,62;,,;,,;,,;,,;,TNT:TNTTNT,TNT2.22.2.1,(172nm,40mm200mm),(É,Ê,Ë;Ì6284)1,1Fig.1Schemaofstirringcirculatingslurryphotocatalyticreactor2.2.2TNTTNT,22Fig.2Schemaofgascirculatingslurryphotocatalyticreactor,ö,(25mm,30mm,800mm),(20W,)5L0.04636m2,a=SöV=9.27m-1,,,,,,COD2.3SPECORDM400,4mL,GBöT13903292[9],UV21201()TNT466nm33.1f(t)=ln(AöA0)3ÉÊ,Ë,pH12,,3Fig.3KineticcurvesoforganicdyesinthecaseofXe2eximerirradiation,11Table1Rateconstantsandsteady2stateconcentrationsofOHradicalsinthephoto2layerwithorganicdyeskö104(m3mol-1s-1)COHphö(molm-3)kö104(m3mol-1s-1)COHphö(molm-3)É7.542.304.343.50Ê5.752.004.682.30Ë1.546.702.985.001,,13,,,7284,,,:TNT,:lg(r)=f(lg(X))(8)(9)(10):Sh=constRepScq(9)BdD=const(udv)p(vDq)(10),p0.30.6,[10],4602000röminp0.81.03.2TNT4TNTTNT(t)4(a),,TNT6h,TNT19.6mgöLTNT95%;TNT45.0mgöLTNT91%,CODTNT75.9mgöL11.7mgöL,TNTTNT,4TNTFig.4PhotocatalyticoxidationperformancewithTNTasamodelpollutant4(b),ln(CöCO),TNTTNT,TNT(5)TNT,TNT,22TNTTable2Rateconstantsandsteady2stateconcentrationsofOHradicalsinthephoto2layerwithTNTCO(TNT)ö(mgL-1)kö104(m3mol-1s-1)COHphö(molm-3)19.62.460.6145.05.771.9812,TNT4(1)TNT(2),,(3)TNT,:[1],,.TNT[J].,1998,21(4):48250.[2]HawariJ,BeaudetS,HalaszA,etal.Microbialdeg2radationofexplosives:biotransformationversusmineralization[J].ApplMicrobiolBiotechnol,2000,54:6052618.[3]MastenSJ,DaviesSHR.Theuseofozonationtodegradeorganiccontaminantsinwastewater[J].EnvironSciTechnol,1994,28(4):1812185.[4],.[J].,2002,22(1):124.[5]GogatePR,PanditAB.Areviewofimperativetech2onologiesforwastewatertreatmentI:Oxidationtechnologiesatambientconditions[J].AdvancesinEnvironmentalResearch,2004,8:5012551.[6],,,.TiO2[J].,1998,10(4):3492361.(17)8284,,1.12S7200,,TP170ARS485,,PCöPPI,2MicrosoftWindows,VisualBasic,,,2.1()2.2,,2.3,,2.4,,,,3,,,,,,,,:[1],.[J].,2003,26(2):16218.[2].[J].,2004,27(4):17220.[3],.[J].,2000,24(2):1092112.[4],.[J].,2003,29(2):20222.(8)[7],,.[J].,2002,17(1):1192121.[8],,.[J].,2003,23(3):125.[9].BGöT13903292,TNT[S].[10],,,.,[J]..2003,N11,8213.71284,,,: