利用氣固相芬頓反應(yīng)降解甲苯等VOCs的基礎(chǔ)性研究

利用氣固相芬頓反應(yīng)降解甲苯等VOCs的基礎(chǔ)性研究摘要：

氣相VOCs是空氣污染的重要組成部分，對環(huán)境與人類健康產(chǎn)生威脅。為解決這一問題，本研究利用氣固相芬頓反應(yīng)對甲苯等VOCs進(jìn)行降解。通過考察氧氣對降解效果的影響、Fe/C復(fù)合材料的制備及表征等方面，深入探究氣固相芬頓反應(yīng)的適用性和優(yōu)劣。結(jié)果表明，氣相中的VOCs經(jīng)過處理后得到明顯的去除，反應(yīng)產(chǎn)物中甲醛的生成量增加。本研究為氣相VOCs的治理提供了新思路和技術(shù)手段。

關(guān)鍵詞：氣相VOCs；氣固相芬頓反應(yīng)；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