超声波降解氯苯水溶液的研究李永峰

161No.1Vol.1620022JournalofChemicalEngineeringofChineseUniversitiesFeb.20021003-9015(2002)01-0093-04,,,,,(450002)pH;,pHX703.1A1(Sonochemistry)[15]CO2H2O,22.1(C6H5Cl)2.2H66025T26.51kHz250W2022.3pHPHS-3CpHE-201-C/65-1AC,2162320.01mol⋅L-12mL752262nmCS2GC-8810FIDS(4.4mm4000mmMPBHPB)KL2001-01-182001-09-05(1976-)9420022/AgAg+j33.1pH0.9826mol⋅m-3pH110.9826mol⋅m-3pH120min2.1410-2mol⋅m-33.20.01029103mol⋅m-30.9826mol⋅m-3120min100min120minAgNO3EV-V0.9826mol⋅m-3120min5.7010-2mol⋅m-33.10.9826mol⋅m-3120min2.1410-2mol⋅m-3120min100minEV]Aglg[059.0/AgAg/AgAg++=++qjj(1),Ag+EE100minAgNO30.9826mol⋅m-3100min1,0.9826mol⋅m-3100min0.9510-2mol⋅m-30.9826mol⋅m-3100min1~210-2mol⋅m-3100min10.9826mol×m-3pHTable1pHvariationofchlorobenzenesolutioninsonochemicaldegradationwithtimeatinitialconcentrationof0.9826mol×m-3Time,min020406080100120pH6.876.325.725.635.525.024.6722VEDD20.04912mol⋅m-3Fig.2Thedegradationcurveofchlorobenzenesolutionwith0.04912mol⋅m-3initialconcentration0204060801001201.801.831.861.891.921.951.98t,min[cb]-0.2,(mol⋅m-3)-0.21Fig.1Thedegradationcurveofchlorobenzenesolutionwith1.5721and0.9826mol⋅m-3initialconcentration0.9826mol⋅m-31.5721mol⋅m-3─calculatedvalues0.870.900.930.960.991.021.051.081.111.140204060801001200.9826mol⋅m-31.5721mol⋅m-3[cb]-0.2,(mol⋅m-3)-0.2t,min161953.30.9826mol⋅m-31.5721mol⋅m-310.04912mol⋅m-32121.5721mol⋅m-3120min57.6%0.9826mol⋅m-30.04912mol⋅m-3120min40.3%30.9%1.21.57210.98260.04912mol⋅m-30.001420.00110.00111min-1,0.973.4H2O+─→─1kOH⋅+H⋅(2)OH⋅+H⋅─→─2kH2O(3)2OH⋅─→─3kH2O2(4)OH⋅+(chloro)benzene─→─4kproducts(5)2Cl⋅Cl2(6)Cl2+H2OHCl+HClO(7)HClOHCl+21O2(8)PPRate=k4[OH⋅][cb](9)(2)~(5)OH⋅0d]d[OH=⋅t(10)[cb]][OH][HO][cb][HRate432214kkkPkk+⋅+⋅=(11)(5)(3)(4)(3)(4)(5)k2[H⋅][OH⋅]k4[OH⋅][cb],k3[OH⋅][OH⋅]k4[OH⋅][cb][cb]][OH][H432kkk⋅+⋅(11)[cb]][OH][HO][HRate32214⋅⋅+⋅⋅=kkPkk(12)H⋅OH⋅[H⋅][OH⋅][H2O](12)Rate=k⋅[cb](13)9620022(6)~(8)4(1),pH,(2)(3)(4)[cb]mol⋅m-3[H2O]mol⋅m-3[H⋅]H⋅mol⋅m-3[OH⋅]OH⋅mol⋅m-3[1]KotronarouA,MillsG,HoffmannMR.Ultrasonicirradiationofp-nitrophenolinaqueoussolution[J].JPhysChem,1991,95(9):3630~3638.[2]WuJM,HuangHS,LivengoodCD.Ultrasonicdestructionofchlorinatedcompoundsinaqueoussolution[J].EnvironmentalProgress,1992,11(3):195~201.[3]CatalloWJ,JunkT.Sonochemicaldechlorinationofhazardouswastesinaqueoussystems[J].WasteManagement,1995,15(4):303~309.[4]VisscherAD,EenooPV,DrijversD,etal.Kineticmodelforthesonochemicaldegradationofmonocyclicaromaticcompoundsinaqueoussolution[J].JPhysChem,1996,100(28):11636~11642.[5]PetrierC,LamyMF,FranconyA.Sonochemicaldegradationofphenolindiluteaqueoussolutions.Comparisonofthereactionratesat20and487kHz[J].JPhysChem,1994,98(41):10514~10526.StudiesonSonochemicalDegradationofChlorobenzeneinWasteWaterLIYong-feng,CHENYi-liang,GUOShi-ling,XUJun,ZHANYu-zhong,WEIDong-yan(CollegeofChemicalEngineering,ZhengzhouUniversity,Zhengzhou450002,China)Abstract:Sonochemicaldegradationofchlorobenzeneinaqueoussolutionswasstudied.ThepHoftheaqueoussolutionsofchlorobenzene,theconcentrationofCl-ionandchlorobenzeneremainedweremeasured.Itisfoundthatthechlorobenzeneconcentrationsinaqueoussolutionswith1.5721,0.9826,and0.04912mol⋅m-3initialconcentrationswerereducedby57.6,40.3,and30.9%after120minutesofsonicationrespectively.TheresultsshowedthatthepHoftheaqueoussolutionsdroppedgradually,theconcentrationofCl-ionwasinthesameorderofmagnitudeasH+ionandincreasedwiththereactiontime,thechemicalkineticsofthereactionforsonochemicaldegradationofchlorobenzenefittedtothefirst-orderratelawapproximately.Themechanismofthesonochemicaldegradationofchlorobenzenewasproposed.Keywords:sonochemicaltechnology;degradation;chlorobenzene;degradationmechanism