等离子体联合纳米技术降解甲苯废气的研究

2008,28(8)699~703ChinaEnvironmentalScience,,*,(,100124),,,.,;[(1),(2),(3)(4)],(η)η(4)η(3)η(2)η(1),95%.(R)R(1)R(2)R(3)R(4).,.GCMS,,,CO2COH2O.X701.7A10006923(2008)08069905Degradationoftolueneinexhaustgaswithplasmaandnano-materials.ZHUTao,LIANGWen-jun,LIJian*,JINYu-quan(CollegeofEnvironmentalEnergyEngineering,BeijingUniversityofTechnology,Beijing100124,China).ChinaEnvironmentalScience,2008,28(8)699~703AbstractNon-thermalplasmaassociatedwithnano-catalyst(madebymyself)wasusedtodegradetolueneunderdifferentelectricfieldandpackedmaterials.Atthesametime,themechanismoftoluenedegradationusingplasmaandcatalystwasdiscussed.Degradationoftolueneincreasedwithincreaseofelectricfieldstrengthanddecreaseofflowvelocityandinitialconcentration.Therewerefourconditionsinplasmawithoutpackedmaterials(1),withpackedmaterials(2),withBaTiO3inthesurfacesofpackedmaterials(3),andwithnano-materialsBa0.8Sr0.2Zr0.1Ti0.9O3(4).Degradationoftoluenedecompositionrepresentedanobvioustrend,thatwas,η(4)η(3)η(2)η(1).Thebestremovalefficiencyoftoluenearrivedat95%.ThedistributionratioofenergyshowedasR(1)R(2)R(3)R(4).Aspackedmaterialsinreactor,nano-materialcouldreducepowerconsumptionontreatingwiththesamequantityoftoluene.Middle-of-the-productsincludealdehyde,alcoholsamide,andbenzenederivativewereanalyzedbyGC-MS.Ifelectricfieldstrengthwasenoughstrong,thefinalresultantswouldbeCO2,COandH2O.Keywordsnon-thermalplasmatoluenedecompositionefficiencyelectricfieldstrengthnano-materials,,,,[14].,,;O3CONOx,.[59],.(Ba0.8Sr0.2Zr0.1Ti0.9O3),,,,.11.11.3,20080107(20040005009)*,,[e-mail]70028.1,27:34,5;556.11..910712778876711541Fig.1Schematicdiagramoftheexperimentalunit1.2.3.4.5.6.7.8.9.10.11.,,2.2Fig.2Structureofplasmareactor,50mm,44mm;0.5mm,,;,,...50Hz,0~100kV.TDS2014.1.21.2.1[10],,Ba0.8Sr0.2Zr0.1Ti0.9O3,SrZr.TiCl4ZrOCl2Ba(OH)2·8H2OSr(OH)2·8H2OHCl.TiCl4100mL,pH=7,,αH2TiO3.Cl,,1004h.Ba(OH)2·8H2OSr(OH)2·8H2O,H2TiO3,pH6~6.5.,,.,,100,Ba0.8Sr0.2Zr0.1Ti0.9O3,XRD40~90nm.QUANTACHROMENOVA1000Micromeritics,,N2(99.999%),300,77.35K,.BET8.7943m2/g,Langmuir12.3145m2/g.1.2.2[11],,,.1.3,AglientTechnologiesHP6890N.FID,HP5(30m,0.32mm,0.25µm),60,300,100.ThermoFinniganTRACEMS(GCMS).(EI)100eV;33~450amu;250;250;(99.999%).,:y=38.419x+6.4975,:R2=0.9997.(η),:00100%iCCCη−=×(1)8701:0C,mg/m3;iC,mg/m3.(R),:41niiiRWW===∑(2):Wi,W.22.1100806040200(%)(a)579111315(kV/cm)70mm/s42mm/s14mm/s56mm/s28mm/s100806040200(%)(b)6810121416(kV/cm)600mg/m31000mg/m31700mg/m32500mg/m33Fig.3Relationshipbetweenelectricfieldstrengthanddecompositionefficiencyunderdifferentflowvelocitiesorconcentrations3,,.,,,,,,.,O3O⋅,CO2COH2O.,14.4kV/cm,95%.2.24(1),(2),(3)(4)4.4,,η(4)η(3)η(2)η(1).,,[3].100806040200(%)6810121416(kV/cm)(1)(2)(3)(4)4Fig.4Relationshipbetweenpackedmaterialsanddecompositionefficiency,(7kV/cm),η(3)η(2)η(1);(8kV/cm),η(3)η(2)η(1).,,,,,,,,.,,,,[6].,70228,.5,.,,,[1213];[14],BaTiO3,,CurieTc,10000,BaTiO312,1/6,,.(59nm,8.7943m2/g),,,,,.,,,,,.10.80.60.40.205060708090(%)(1)(2)(3)(4)5Fig.5Relationshipbetweenpowerratioanddecompositionefficiencyoftoluene1,,(1)(2)(3)(4).,,.5,η,(1),,;R(2)R(3)R(4).90%η70%,(1);η90%,(2)90%.(4),,.1(W)Table1Relationshipbetweenpower(W)anddecompositionefficiencyunderdifferentpackedmaterials(%)5060708090(1)25.028.0(2)13.422.025.028.0(3)8.713.7522.025.228.0(4)7.510.914.325.026.1:,2.310090806030705010204005101520253035(min)1.287.039.6613.6113.9523.4726.8332.02(a)10kV/cm6030705010204005101520253035(min)(b)14.3kV/cm1.287.039.6613.6113.9523.4726.8332.026Fig.6Massspectrumfortoluene6,,,;,,.NIST20008703,(4),.,:e+O2→2O+(3)e+H2O→2H++O+(4)e+N2→2N+(5)3.6eV,,,,,,:CH3+e→•+•CH3(6)→CH3+•H•(7)→CH2+•H•(8)→•CHCH•+•CHCHCH=CH•CH3(9)→•CHCHCHCH•+•CHCH•CH3(10),,.6(b)14.3kV/cm,,.,,,,CO2COH2O.33.1,[(1),(2),(3)(4)],η(4)η(3)η(2)η(1),95%.3.2104,,,,.3.3,,.3.4GCMS,.,,CO2COH2O..[1],.[J].,2000,(1):2328.[2],,,.[J].,2001,21(6):531534.[3],,,.[J].,2007,29(12):920924.[4],,,.[J].,2007,39(6):862866.[5]Yamamoto,Chpel.Methodsandapparatusforcontrollingtoxiccompoundsusingcatalysis-assistednon-thermalplasma[J].EnvironmentalInternational,1997,23(6):321.[6],.VOCs[J].,2000,32(1):2427.[7],,.[J].,2005,31(11):3132.[8],,,.[J].,2008,28(2):121125.[9]KrawczykK,MlotekM.Combinedplasma-catalyticprocessingofnitrousoxide[J].Appl.Catal.B:Environ.,2001,30:233245.[10],,,.[J].(B),2001,31(6):525529.[11],,.TiO2[J].,2006,38(6):799803.[12]JC,GW.[M].:,1988.[13],,,.[J].,2002,19(1):6570.[14]WestAR.Solidctatechemistryanditsapplications[M].NewDelhi:JohnWileySonsLtd.,1991:534540.(1979),,,,,.10.