超声波协同零价铁降解硝基苯

33(186)20105EnvironmentandEcologyintheThreeGorgesVol.3No.3(Sum.No.186)May.2010:20100202:(GJJ10637):(1985),,,2007,Email:[e-mail]:,Email:[e-mail]李天鹏1,郑丽华2(1.,430000;2.,330000):pH,,,pH,496,:;;;:X7031:A:16742842(2010)03001104DegradationofNitrobenzeneundertheConditionofUltrasoundSynergizedwithZeroValentIronLITianpeng1,ZHENGLihua2(1.DeptartmentofChemistryandEnvironmentalEngineering,WuhanBioengineeringInstitute,Wuhan430000,China;2.DeptartmentofManagementEngineering,NanchangInstituteofTechology,Nanchang330000,China)Abstract:TheeffectsofinitialpH,irondosageandultrasoundpowerondegradationofnitrobenzenewereinspectedbyorthogonalexperimenttofindthebestreactionconditions,andthedegradationkineticswasdiscussed.Theresultsshowthatthedegradationrateincreaseswiththeincreaseofirondosageandultrasoundpower,whereaslittlechangewiththeincreaseofinitialpH.Thesynergeticeffectofultrasoundcombinedwithzerovalentironondegradationofnitrobenzeneissignificant,andcofactoris4.96.Thedegradationaccordswiththepseudofirstorderreactionkineticslaw.Keywords:ultrasound;zerovalentiron;nitrobenzene;synergism,,,,,[1],,,[2],,,11.1KQ250E();320P01pH();SP752(),1.2LD10mm4mm5%(v/v),20min,,50mL50mg/L,150mL,pH3.0,1.0g,,,30min111.3(GB)22.1,1,21A:pH3.06.09.0B:/g0.00.51.0C:/W100150200KiiABCKi,Kimax-Kimin,BCA,pH3.01.0g200W2.2pH,2.2.1铁屑投加量对降解效果的影响50mg/L,pH3.0,200W,,22ABC/%13.00.010033.423.00.515060.633.01.020081.846.00.015034.056.00.520068.466.01.010071.179.00.020036.589.00.510066.999.01.015070.3K158.634.657.1K257.865.355.0K357.974.462.2R0.839.87.2A1B3C3:22,1.0g,,,,,,,123,[3];Fe2+,Fe(OH)2,,!,[4],1.0g2.2.2超声波功率对降解效果的影响50mg/L,pH3.0,1.0g,,333,,,,,,,,[5],,,[6],,200W2.2.3初始pH值对降解效果的影响50mg/L,1.0g,200W,pH,44,,:,:2H++2e∀2[H]∀H2#E(H+/H2)=000V(1)4pHFe2+[H],,[7],Fe2+Fe3+[8],:O2+2H2O+4e∀4OH-E(O2/OH-)=040V(2)Fe2+Fe3+OH-Fe(OH)2Fe(OH)3,,[9],,,,pH3.02.350mg/L,pH3.0,1.0g,200W,,555,90min,25.9%38.3%,133(186),:90min,97.0%,,,,[10][11]!,,,lnctc0=kt,66ln(Ct/C0)6,lnCtC0t(R20.95),,:kU=-3.410-3min-1kZ=-2.310-3min-1kU/Z=-2.810-2min-1,E=kU/ZkU+kZ=4.96,,[12]33.1,pH,pH3.01.0g200W3.2,,pH3.3,4.96,:[1],,.[J].,2009,29(10):913.[2]VisscherAD,EenooPV,DrijversD,etal.Kineticmodelforthesonochemicaldegradationofmonocyclicaromaticcompoundsinaqueoussolution[J].JounalofPhysicsChemistry,1996,100(28):1163611642.[3],,,.2,4[J].,2007,(7):414417.[4],,,.[J].(),2009,6(1):3437.[5]PraveenaJD,KandasanyP,LeeCS.Degradationof2,4dichlorophenolinaqueoussolutionbysonoFentonmethod[J].KoreanJournalchemistryEngineering,2008,25(1):112117.[6]WuJM,HuangHS,LivergoodCD.Ultrasonicdestructionchlorinatedcompoundsinaqueoussolution[J].EnvironmentProject,1992,11(3):195201.[7],.[J].,2001,20(3):9598.[8]BossmannSH,OliverosE,GobS.EvidenceagainsthydroxylradicalsasreastiveintermediatesinthethermalandphotochemicallyenhancedFentonreactions[J].PhysicsChemistryA,1998,102(28):55425550.[9],.[J].,2009,35(1):2627.[10]DaiYZ,LiFF,GeF,etal.Mechanismoftheenhanceddegradationofpentachlorophenolbyultrasoundinthepresenceofelementaliron[J].JournalofHazardousMaterials,2006,2(137):14241429.[11]PanditAB,CogatePR,MujumdarS.Ultrosonicdegradationof2:4:6trichlorophenolinpresenceofTiO2catalyst[J].UltrosonicsSonochemistry,2001,8(3):227331.[12],.[J].,2005,15(2):7679.143