超声波和零价铁联用对氯代苯酚脱氯降解作用的研究

311环境工程学报Vo.l3,No.11200911ChineseJournalofEnvironmentalEngineeringNov.2009赵保卫周怡赵艺(,730070)3(CP)2,4(DCP)2,4,6(TCP),pH,,,25mg/L,pH,200W,,CPDCPTCP00613h-10374h-10197h-1X7031A16739108(2009)11197304StudyondechlorinationofchlorinatedphenolsbyultrasoundandzerovalentironZhaoBaoweiZhouYiZhaoYi(SchoolofEnvironmentalandMunicipalEngineering,LanzhouJiaotongUniversity,Lanzhou730070,China)AbstractInthispaper,thedechlorinationof3chlorophenol(CP),2,4dichlorophenol(DCP)and2,4,6trichlorophenol(TCP)byultrasound(US)andzerovalentiron(Fe0)wasinvestigated.Theinfluencesofironaddition,powerofultrasound,initialconcentrationofphenolsandpHvaluesofsolutionondechlorinationefficiencyweretestedandthekineticsofdechlorinationwasdiscussed.ItwasshownthatthedechlorinationbyUS/Fe0wassignificantingenera.lWhentheinitialconcentrationofphenolswas25mg/L,thepHvaluesofsolutionwasweakacid,andthepowerofultrasoundwas200W,theefficiencyofdechlorinationwasuptothebiggestvalue.Thedechlorinationreactionwasapseudofirstorderreactionandtherateconstantswere00613h-1,0374h-1and0197h-1forCP,DCPandTCP,respectively.Keywordsdechlorination;ultrasound;zerovalentiron;chlorinatedphenol:(Z2005162010);(3ZS051A25039);:2008-11-12;:2008-12-01:(1968~),,,,Emai:[e-mail],,,,,,,[1,2]2090,[3,4],Fe2+FeH2O[5,6],,,,1900~5200K5065!107Pa∀OH∀O∀OOH,,,CO2H2O[7],,3[8,9],(),,,3(CP)2,4(DCP)2,4,6(TCP),,11.1DG(,0~300W,28kHz),(,30cm!20cm!4cm);ORION828();PClS10()CP(,AcrosOrganics,USA);DCP(,);TCP(,AcrosOrganics,USA);(,),5%,,1.2,100mL,,H2SO4NaOHpH,,,20#,1h,22.1125mg/LpH3200W,1,,,,,;024(CP)036(DCP)048g(TCP),462%785%705%,,,,,,,,1Fig.1Effectsofironadditionondechlorinationefficienciesofchlorinatedphenols2.2pH225mg/L024036048g200WpH2,pH,,pH3,CPDCPTCP,475%701%674%,H+,FeH2O,2pHFig.2EffectsofpHvaluesofsolutionsondechlorinationefficienciesofchlorinatedphenols197411:[5];pH,,,H+,,H+OH-,2.33,024036048gpH3200W,,,25mg/L,657%(CP)701%(DCP)695%(TCP),,,,,,,,,,3Fig.3Effectsofconcentrationsofchlorinatedphenolsonchlorinationefficiencies2.44,,,200W,635%(CP)729%(DCP)695%(TCP)0~200W2:(1)Fe/H2O,5:∃Fe;%;&;∋Fe;(;,,,,,(2),,,,,,,,,;,,,,[10]4Fig.4Effectsofultrasoundpowerondechlorinationefficiencies2.5,,502g,CPDCPTCP,;1h,,DCPTCP,CP;DCPTCPCP,[11]197535Fig.5Relationshipbetweendechlorinationefficienciesandreactiontimeln(C/C0)t,,:ln(C/C0)=-kt(1):k(h-1);C(mo1/L);C0(mol/L);t(h),k,1Arrhenius,k,E,,k13Table1ReactionrateconstantsofthreechlorinatedphenolsR2k(h-1)CPln(C/C0)=-0.0613t-8.590.98300.0613DCPln(C/C0)=-0.374t-8.820.98740.374TCPln(C/C0)=-0.197t-9.000.98940.1973024(CP)036(DCP)048g(TCP)25mg/L200WpH,,DCP,TCP,CP,3:DCPTCPCP[1]MaymoG.X.,NijenhuisI.,ZinderS.H.Reductivedechlorinationofcis1,2dichloroetheneandvinylchloridebyDehalococcoidesethenogenes.Environ.Sc.iTechno.l,2001,35(3):516~521[2],,,..,2005,30(6):52~55[3],,,.TCE/PCEDNAPL.,2006,7(4):12~18[4]HaraJ.,ItoH.,SutoK.,etal.Kineticsoftrichloroethenedechlorinationwithironpowder.WaterRes.,2005,39(6):1165~1173[5]MathesonL.J.,TratnudkP.G.Reductivedehalogenationofchlorinatedmethanesbyironmeta.lEnviron.Sc.iTechno.l,1994,28(12):2045~2053[6]GillhamR.W.,O)HannesinS.F.Enhanceddegradationofhalogenatedaliphaticsbyzerovalentiron.GroundWater,1994,32(6):958~967[7],,,..,2001,22(5):102~104[8]EntezariM.H.,MostafaiM.,SarafrazyazdiA.Acombinationofultrasoundandabiocatalyst:Removalof2chlorophenolfromaqueoussolution.UltrasonicsSonochemistry,2006,13(1):37~41[9],,./.,2005,6(11):19~22[10]DaiY.,LiF.,GeF.,etal.Mechanismoftheenhanceddegradationofpentachlorophenolbyultrasoundinthepresenceofelementaliron.J.Hazard.Mater.,2006,137(3):1424~1429[11],./QSPR.,2007,30(11):38~401976