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286200911ENVIRONMENTALCHEMISTRYVol.28,No.6November20092009110.3(WTWER0719).33,E2mail:chenzzg@nju1edu1cnEDTA333(,,,,210093)EDTA,,EDTA;/EDTA1000mgl-1:120gl-1,20gl-1,pH3,EDTA1mmoll-1.60min,8917%,5318%.EDTA,pH,/EDTA6315%,1915%.,,/EDTA.,EDTA,,.,[1].,,,.,,,H2O2Fenton,[2],EDTAFe2+H2O[3]2.FeEDTAH2O2,,,FentonpH4.EDTA,EDTA,GC/MS,/EDTA,EDTA.11111000mgl-1,,pH,1000mgl-1,,EDTA./EDTA(40,80,120,160,200mgl-1)pH(1,3,5,7)EDTA(015,1,2,4,6mmoll-1),,.112CODGB11914219891COD:A%=Ct/C0100%(C0COD;CtCOD).(756MC).400nm,,,:A%=Ct/C0100%(C0,1000mgl-1;Ct).pHpH;EDTA(,SPD210AVP)[4].GC/MS(,9890N/5360):10ml,H2SO478428pH2,30ml3,2ml,GC/MS.:(30m0125m,0125m),501min,8min-13001min,1l.:EI,70eV,200.2211EDTA1000mgl-1.,80gl-120gl-1pH3.:EDTA,EDTA2mmoll-1,1000mgl-1,CODEDTA.2mmoll-1EDTA,EDTA.1(a)(b),,COD,80min,EDTA,COD8817%6715%,5318%2914%.Fe2+[H],,EDTA,EDTA/Fe2+O2H2O2Fenton,,.,EDTA.1(c)(d),EDTA,,,EDTA.,EDTA,,EDTA/Fe2+O2H2O2,.,Noradoun[3]FeEDTA,EDTAC3CO2CO,C3CO2CO35%,FentonEDTACOD,COD.1EDTA(a)/EDTA(b)/EDTACOD(c)EDTA(d)/EDTAFig11TheeffectofEDTAonthedegradationof42NPinmicro2electrolysissystem6:EDTA785212/EDTA21211/EDTA20gl-1,pH3,EDTA2mmoll-1,21000mgl-1.40gl-1120gl-1,60min,6014%8419%.200gl-1,7619%.120gl-1,,Fe2+EDTA,Fenton;,,H2O2[5],H2O2,Fe2+,H2O2,OH,OHOH[6].21212pH/EDTA120gl-120gl-1,EDTA2mmoll-1,pHpH/EDTA1000mgl-1,3,pH3,/EDTA8419%,,pH7,6315%,5318%,pH71915%.,Fe2+,;/EDTA,EDTAFe2+,Fenton,,EDTApH.2Fig12Influenceofironon42NPdegradation3pHFig13InfluenceofpHon42NPdegradation21213EDTA/EDTA120gl-1,20gl-1,pH3,4EDTA.EDTA1mmoll-1,8917%,EDTA,.EDTA[Fe(EDTA)(O2)]2-[3],[Fe(EDTA)(O2)]2-H2O2,[Fe(EDTA)(O2)]2-H2O2.,EDTA1mmoll-1.4EDTAFig14InfluenceofEDTAconcentrationon42NPdegradation78628213/EDTA/EDTAGC/MSHPLC,.5/EDTAHPLC,,,,EDTA.,/EDTA,6.[H],,EDTAFenton,OH,OH,OH,.5/EDTAHPLCFig15TheHPLCof42NPinmicro2electrolysis/EDTAsystem6/EDTAFig16Proposeddegradationpathwayof42NPinmicro2electrolysis/EDTAsystem3(1)EDTA,EDTA,5318%,/EDTA8817%.(2)EDTApH,120gl-1,20gl-1,pH7,EDTA2mmoll-1,6315%;1915%.(3)EDTA:120gl-1,20gl-1,pH3,EDTA1mmoll-1,60min,8917%.6:EDTA787[1],,,2,42[J]1,2008,27(2)186189[2],,,FentonFenton2,42D[J]1,2005,24(4)365369[3]NoradounCE,ChengIF,EDTADegradationInducedbyOxygenActivationinaZeroValentIron/Air/WaterSysterm[J]1Environ.Sci.Technol.,2005,39(18)71587163[4]BergersPJM,DegrootAC,TheAnalysisofEDTAinWaterbyHPLC[J]1WaterRes.,1994,28(3)639642[5]KavithaV,PalaniveluK,DegradationofNitrophenolsbyFentonandPhoto2FentonProcesses[J]1Chemistry,2005,1708395[6]JulianaCB,MiltonDC,LadislauMNetal1,OxidationDecompositionofAtrazinebyaFenton2LikeReactioninaH2O2/FerrihydriteSystem[J]1WaterResearch,2007,415562THEEFFECTOFEDTAONTHEDEGRADATIONOF42NITROPHENOLINMICRO2ELECTROLYSISSYSTEMLISongLIUBoWANGQiYANDong2dongWUWen2feiCHENZe2zhi(EngineeringCenterofWaterTreatmentandEnvironmentRemediation,MinistryofEducation,NationalKeyLaboratoryofPollutionControlandResourceReuse,SchooloftheEnvironmentofNanjingUniversity,Nanjing,210093,China)ABSTRACTThemaindisadvantageofconventionalmicro2electrolysistreatmentisthatthedegradationefficiencyisnotveryhigh1Tosolvethisproblem,theeffectofEDTAenhancementonthedegradationof42NPinthemicro2electrolysis/EDTAsystemwasinvestigated,duringwhichEDTAand42NPwasdegradedbythemicro2electrolysissystem1TheresultsshowedthatEDTAcouldimprovetheremovalrateof42NP1Theoperatingconditionsfordegradationof42NP(1000mgl-1)inthemicro2electrolysis/EDTAsystemwereoptimizedbyindividualfactorexperimentsandtheywereasfollowing:C(Fe)=120gl-1,C(C)=20gl-1,C(EDTA)=1mmoll-1,pH=31Underthiscondition,42NPremovalratesreached8917%within60min,whiletheremovalrateof42NPwasonlyachieved5318%bytheconventionmicro2electrolysistreatment1Themostdeservesattentionwasthatmicro2electrolysis/EDTAsystemalsodisplayedareasonablegooddegradationactivityinaneutralcondition.Theremovalof42NPinmicro2electrolysis/EDTAsystemwasover6315%atpHof7,whileitwasonly1915%inmicro2electrolysissystem1Thedegradationproductsof42NPwereidentifiedwithGC/MSmethodsandthedegradationpathwaysof42NPwerediscussed1Keywords:micro2electrolysis,EDTA,effect,42nitrophenol.