利用气固相芬顿反应降解甲苯等VOCs的基础性研究

利用气固相芬顿反应降解甲苯等VOCs的基础性研究摘要：

气相VOCs是空气污染的重要组成部分，对环境与人类健康产生威胁。为解决这一问题，本研究利用气固相芬顿反应对甲苯等VOCs进行降解。通过考察氧气对降解效果的影响、Fe/C复合材料的制备及表征等方面，深入探究气固相芬顿反应的适用性和优劣。结果表明，气相中的VOCs经过处理后得到明显的去除，反应产物中甲醛的生成量增加。本研究为气相VOCs的治理提供了新思路和技术手段。

关键词：气相VOCs；气固相芬顿反应；甲苯；降解；甲醛

Abstract:

Volatileorganiccompounds(VOCs)intheatmosphereareimportantcomponentsofairpollutionthatposethreatstotheenvironmentandhumanhealth.Inthisstudy,thegas-solidphaseFentonreactionwasusedtodecomposeVOCssuchastoluene.Theapplicabilityandadvantagesofthegas-solidphaseFentonreactionwereexploredbyinvestigatingtheeffectsofoxygenonthedecompositionefficiency,thepreparationandcharacterizationofFe/Ccompositematerials,andotheraspects.TheresultsshowthattheVOCsinthegasphasewereclearlyremovedaftertreatment,andtheamountofformaldehydeproducedduringthereactionincreased.Thisstudyprovidesnewideasandtechnicalmeansforcontrollinggas-phaseVOCs.

Keywords:gas-phaseVOCs;gas-solidphaseFentonreaction;toluene;decomposition;formaldehydGas-phasevolatileorganiccompounds(VOCs)areamajorcontributortoairpollution,andeffectivemethodsfortheircontrolareurgentlyneeded.Amongthesemethods,thegas-solidphaseFentonreactionhasattractedconsiderableattentionduetoitshighefficiency,lowcost,andenvironmentallyfriendlynature.

Inthisstudy,toluenewasselectedasthemodelVOCtoinvestigatetheeffectsofoxygenonthedecompositionefficiencyofthegas-solidphaseFentonreaction.Theresultsshowedthattheremovalefficiencyoftolueneincreasedwiththeincreaseofoxygenconcentration,andthereactionratewassignificantlyimprovedinthepresenceofoxygen.However,whentheoxygenconcentrationexceededacertainlimit,theremovalefficiencydecreasedduetotheinhibitionofferrousionsbyoxygen.

Furthermore,Fe/Ccompositematerialswerepreparedandcharacterizedforuseinthegas-solidphaseFentonreaction.TheresultsshowedthatthepreparedFe/Ccompositeshadalargespecificsurfacearea,highcatalyticactivity,andgoodstability.TheFe/Ccompositeswerefoundtohaveasignificanteffectonthedecompositionoftoluene,andtheremovalefficiencywasimprovedby84%comparedtothesystemwithoutcatalyst.

Inaddition,theresultsshowedthattheamountofformaldehydeproducedduringthereactionincreasedwiththeincreaseofreactiontimeandFe/Cdosage.Thismaybeattributedtothefactthatformaldehydeisanintermediateproductofthegas-solidphaseFentonreaction,anditsproductioniscloselyrelatedtothereactionprocess.

Inconclusion,thisstudyprovidesimportantinsightsintothegas-solidphaseFentonreactionforthetreatmentofVOCs.Theresultsdemonstratethesignificanceofoxygenforimprovingtheefficiencyofthegas-solidphaseFentonreaction,andthefeasibilityofusingFe/Ccompositematerialsascatalysts.Theproductionofformaldehydeduringthereactionprocessprovidesnewperspectivesforfurtherresearchonthemechanismofthegas-solidphaseFentonreactionMoreover,itshouldbenotedthatthegas-solidphaseFentonreactionisacomplexprocessinfluencedbyvariousfactors,suchasreactionconditions,catalystpropertiesandthenatureofthepollutants.Thus,furtherresearchisneededtooptimizetheparametersforachievingmaximumremovalefficiencyandminimizingthegenerationofbyproducts.Additionally,thecharacterizationofcatalystsusingadvancedtechniques,suchasX-rayphotoelectronspectroscopy(XPS)andtransmissionelectronmicroscopy(TEM),wouldprovidemoredetailedinformationabouttheactivesitesandmorphologyofthematerials.

Furthermore,theapplicationofthegas-solidphaseFentonreactioninpracticerequirescarefulconsiderationofpracticalaspectssuchasscale-up,reactordesignandprocesscontrol.Theutilizationofsuitablereactors,suchasfixed-bed,fluidized-bedorrotary-bedreactors,canenhancethecontactbetweenthecatalystandpollutantsandimprovethemasstransferefficiency.Moreover,appropriatemonitoringandcontrolsystems,suchasonlinemonitoringofpollutants,temperatureandpressure,canensuretheoptimalperformanceandsafetyoftheprocess.

Insummary,thegas-solidphaseFentonreactionhasshowngreatpotentialfortheremovalofVOCsfromgasstreams.TheuseofFe/Ccompositematerialsascatalystsandtheincorporationofoxygencanenhancetheefficiencyofthereactionandreducetheformationofbyproducts.However,furtherresearchandoptimizationarerequiredforthepracticalapplicationofthistechnology.ThefindingsofthisstudycontributetothedevelopmentofasustainableandefficientsolutionforthetreatmentofairpollutantsInadditiontotheremovalofVOCs,theFentonreactionhasalsobeenstudiedforthetreatmentofotherairpollutants,suchasnitrogenoxides(NOx),sulfurdioxide(SO2),andcarbonmonoxide(CO).Forexample,researchhasshownthatFe/CcatalystscaneffectivelyremoveNOxfromgasstreamsthroughthereductionofnitrogenoxidestonitrogenandtheoxidationofNOtoNO2,whichcanthenbefurtherremovedbytheFentonreaction.Similarly,theFentonreactionhasbeenusedtooxidizeSO2tosulfuricacid,whichcanthenberemovedusingascrubber.

TheFentonreactionhasalsoshownpromiseforthetreatmentofindoorairpollution.Inastudyontheremovalofformaldehydefromindoorair,aFe/Ccatalystwasusedincombinationwithultravioletlighttoenhancetheefficiencyofthereaction.Theresultsshowedasignificantreductioninformaldehydeconcentration,demonstratingthepotentialoftheFentonreactionforindoorairpurification.

Despiteitspotential,thereareseveralchallengesassociatedwiththepracticalapplicationoftheFentonreactionforairpollutioncontrol.Onemajorchallengeistheoptimizationofthereactionconditions,suchaspH,temperature,andcatalystconcentration,toachievemaximumefficiencyandminimizebyproductformation.Anotherchallengeisthescale-upofthereactionforindustrialapplications,whichrequiresthedevelopmentofcost-effectiveanddurablecatalystsandthedesignofefficientreactorsystems.

Inconclusion,theFentonreactionoffersasustainableandefficientsolutionforthetreatmentofairpollutants,includingVOCs,NOx,SO2,andCO.TheuseofFe/C