超声波零价铁体系降解苯胺废水的影响因素及机理研究

/吴志敏,张丽(广东纺织职业技术学院,广东佛山528041):,/,pH,:/,2.8g/L,pH7~8;/,OH,;,/:/(US/Fe0);;;;:X703.1:A:16711556(2010)04001304:20100121:20100305:(1978),,,,Email:[e-mail]chanismofAnilineWastewaterDegradationbyUltrasound/ZerovalentIronSystemWUZhimin,ZHANGLi(GuangdongTextilePolytechnic,Foshan528041,China)Abstract:Degradationofanilineinwaterbytheultrasound/zerovalentironsystem(US/Fe0)wasexplored.TheeffectofFe0dose,initialpHvalueandinitialanilineconcentrationontheoxidationprocessandthedegradationefficiencywasstudied.TheresultsindicatedthatdegradationefficiencywasfoundtobethelargestwhenFe0was2.8g/LandinitialpHValuewas7~8.ThesynergisticeffectsexistedbetweenultrasoundandFe0,theoxidationofhydroxylradicalsplayedadominantroleinthedegradationprocessandthedegradationofanilinebyUS/Fe0followedfirstorderkinetics.UVVisspectrashowedthatbenzeneringofanilinehadbeendestroyedduringthereaction.Keywords:ultrasound/zerovalentironsystem;anilinewastewater;degradation;affectionfactor;mechanism0,[1],,,,,[2][3][4][5],,,,,,,,,/(US/Fe0),17420107安全与环境工程SafetyandEnvironmentalEngineeringVol.17No.4Jul.201011.1:FS300();UV1800();752;PHS3CpH;:();();();()1.2200mL20mg/L,30!;1mol/LH2SO4NaOHpH,,;,N(1)11Fig.1Ultrasonicreactor1.;2.;3.();4.;5.22.1/2.1.1Fe0投加量pH7.090min,Fe0,Fe0,22:Fe02.8g/L,,93.8%,Fe02.9g/L;Fe0,:Fe0,Fe0,,,,[6~8];,Fe0,,,,,,[9]2Fe0Fig.2EffectofFe0loadingonthedegradationofaniline2.1.2废水初始pH值Fe02.8g/L90min,pH,pH,33:pH7~8:,pH,;pH,,,,OH;,OH,pH8.11,OHC6H5NH2pH4OHC6H5NH+33[10]pH,,CO23pHFig.3EffectofinitialpHonthedegradationofaniline14安全与环境工程第17卷HCO-3CO2-3,OH,2.1.3苯胺初始浓度Fe02.8g/LpH790min,,44::,;OH,[11],US/Fe04Fig.4Effectofinitialconcentrationonthedegradationofaniline2.2US/Fe02.2.1不同体系苯胺的降解特性US/Fe0,:,OH;US/Fe0,(US)(Fe0)/(US/Fe0)3(5),3Fe0USUS/Fe0;3(61),US/Fe0USFe03,KUS/Fe0(KFe0+KUS),[12]E=KUS/Fe0/(KFe0+KUS)∀100%=281%,US/Fe0,,OH[13]13Table1FirstorderkineticconstantsindifferentsystemsUS/Fe0USFe0K/(min-1)3.058∀10-21.001∀10-28.895∀10-4(R2)0.992650.975430.982932.2.2叔丁醇对US/Fe0体系降解效果的影响US/Fe0OH,,US/Fe0,77:,93.8%;5mmol/L,39%;50mmol/L,5.8%,,,,US/Fe0OH15第4期吴志敏等:超声波/零价铁体系降解苯胺废水的影响因素及机理研究7Fig.7Effectoftertbutanoladdingonthedegradationofaniline2.3US/Fe0Fe02.8g/LpH7,30min60min90min,UVVis,8UVVisFig.8ChangesofUVVisspectraduringthedegradationofaniline88:UVVis,230nmNHK,280nmNHB[14];,,90min:US/Fe0NH,,[15],:3(1)US/Fe020mg/L,:Fe02.8g/L,pH7~8(2),US/Fe0(3)US/Fe0,Fe0US2.81US/Fe0OH:[1].[D].:,,2007.[2].[J].,2006,26(2):107-110.[3].[J].,2005,45(1):26-31.[4].[J].,2006,29(8):93-95.[5],,.[J].,2004,24(1):33-37.[6]Dai,Y.Z.,F.F.Li,F.Ge,etal.Mechanismoftheenhanceddegradationofpentachlorophenolbyultrasoundinthepresenceofelementaliron[J].J.HazardMateri,2006,137(3):1424-1429.[7]Entezari,M.H.,A.Heshmati,Y.A,Sarafraz,etal.Acombinationofultrasoundandinorganiccatalyst:Removalof2chlorophenolfromaqueoussolution[J].UltrasonicsSonochemistry,2005,12(1/2SPEC.ISS.):137-141.[8]Pandit,A.B.,P.R.Gogate,S.Mujumdar.Ultrasonicdegradationof2:4:6trichlorophenolinpresenceofTiO2catalyst[J].UltrasonicsSonochemistry,2001,8(3):227-231.[9],,,.2,4[J].,2005,27(3):87-90.[10]Yi,J.,C.Petrier,T.D.Waite.EffectofpHontheultrasonicdegradationofionicaromaticcompoundsinaqueoussolutio[J].UltrasonicsSonochemistry,2002,9:163-168.[11],,./2,4[J].,2008,21(2):4-9.[12],,.US/O3[J].,2006,57(2):390-396.[13]./[D].:,,2007.[14].[M].:,1985:78-83.[15],,.Fenton[J].,2008,28(9):51-69.16安全与环境工程第17卷