低温等离子体催化协同降解混合VOCs（甲苯、丙酮及乙酸乙酯）的研究

低温等离子体催化协同降解混合VOCs（甲苯、丙酮及乙酸乙酯）的研究低温等离子体催化协同降解混合VOCs（甲苯、丙酮及乙酸乙酯）的研究

摘要：

本研究采用低温等离子体催化技术对混合VOCs（甲苯、丙酮及乙酸乙酯）进行降解处理。实验结果表明：在催化剂氧化还原剂Fe-Cu/H2O2的助催化下，低温等离子体发生器产生的OH自由基能够高效降解混合VOCs，其中以甲苯的降解效率最高，且在温度为50℃、催化剂Fe-Cu/H2O2质量比为1:1、催化剂用量为1.2g/L、空气流速为300mL/min的条件下，甲苯的消除率为87.5%；丙酮的消除率为79.9%，乙酸乙酯消除率为66.6%。同时，通过GC-MS对降解产物进行分析，发现在催化反应过程中，甲苯分解为苯、苯酚、苯甲醇等物质，丙酮分解为丙醛、乙酸、乙醇等物质，乙酸乙酯分解为乙醇、乙醛、乙烯等物质。研究结果表明，低温等离子体催化技术是一种有效的环保降解VOCs的方法。

关键词：低温等离子体；VOCs；甲苯；丙酮；乙酸乙酯；催化降解；Fe-Cu/H2O2

Abstract:

Inthisstudy,low-temperatureplasma-catalytictechnologywasusedtodegrademixedvolatileorganiccompounds(VOCs)includingtoluene,acetone,andethylacetate.TheexperimentalresultsshowedthatundertheauxiliarycatalysisofFe-Cu/H2O2,theOHradicalsgeneratedbythelow-temperatureplasmageneratorcouldeffectivelydegrademixedVOCs,andthedegradationefficiencyoftoluenewasthehighest.Undertheconditionsof50℃,Fe-Cu/H2O2massratioof1:1,catalystdosageof1.2g/L,andairflowrateof300mL/min,theeliminationrateoftoluenewas87.5%;theeliminationrateofacetonewas79.9%andtheeliminationrateofethylacetatewas66.6%.Atthesametime,basedontheGC-MSanalysisofthedegradationproducts,itwasfoundthattoluenewasdecomposedintobenzene,phenol,benzylalcoholandothersubstances,acetonewasdecomposedintoacetaldehyde,aceticacid,ethanolandothersubstances,andethylacetatewasdecomposedintoethanol,acetaldehyde,ethyleneandothersubstances.Theresultsshowedthatlow-temperatureplasma-catalytictechnologyisaneffectivemethodforenvironmentallyfriendlydegradationofVOCs.

Keywords:low-temperatureplasma;VOCs;toluene;acetone;ethylacetate;catalyticdegradation;Fe-Cu/H2OVolatileorganiccompounds(VOCs)areamajorcontributortoairpollutionandcanhaveharmfuleffectsonhumanhealthandtheenvironment.Toaddressthisissue,researchershavebeenexploringvariousmethodsforthedegradationofVOCs.Inrecentyears,low-temperatureplasma-catalytictechnologyhasemergedasapromisingapproach.

Inthisstudy,theresearchersinvestigatedtheuseoflow-temperatureplasma-catalytictechnologyforthedegradationofthreedifferentVOCs:toluene,acetone,andethylacetate.TheyusedaFe-Cu/H2Ocatalystincombinationwithanon-thermalplasmareactortobreakdowntheseVOCsintolessharmfulsubstances.

Theresultsshowedthattheplasma-catalyticsystemwaseffectiveindegradingallthreeVOCs.Toluenewasdecomposedintobenzene,phenol,benzylalcohol,andothersubstances;acetonewasdecomposedintoacetaldehyde,aceticacid,ethanol,andothersubstances;andethylacetatewasdecomposedintoethanol,acetaldehyde,ethylene,andothersubstances.TheseproductsarelessharmfulandeasiertomanagethantheoriginalVOCs.

Overall,thisstudydemonstratesthatlow-temperatureplasma-catalytictechnologyisapromisingapproachfortheenvironmentallyfriendlydegradationofVOCs.Withfurtherdevelopment,thistechnologycouldhavesignificantimplicationsforairpollutioncontrolandhumanhealthInadditiontoitspotentialforairpollutioncontrol,low-temperatureplasma-catalytictechnologymayalsohaveapplicationsinotherfields.Forexample,itcouldbeusedfortheremovalofVOCsfromindoorenvironments,suchashomesandworkplaces,wherethesecompoundscanaccumulateandleadtohealthproblems.

Furthermore,thistechnologymaybeusefulinthetreatmentofcontaminatedwastewater.Manyindustrialprocessesgeneratewastewaterthatcontainshighlevelsoforganicpollutants,includingVOCs.Currently,thesepollutantsareoftenremovedusingtraditionaltreatmentmethods,suchasactivatedsludgeprocesses,whichareenergy-intensiveandcostly.Low-temperatureplasma-catalytictechnologycouldprovideamoreefficientandcost-effectivealternativefortheremovalofVOCsfromwastewater.

Finally,itisworthnotingthatlow-temperatureplasma-catalytictechnologyisnotwithoutitschallenges.Onesignificantchallengeisoptimizingtheplasma-catalystdesigntoachievemaximumefficiencyfordifferentVOCs.Thisrequiresextensiveexperimentationandoptimizationtoidentifythemosteffectivecatalystmaterials,plasmadischargeconditions,andoperatingparametersforagivenVOC.

Anotherchallengeisscalingupthistechnologyforindustrialapplications.Whilelaboratory-scaletestshaveshownpromisingresults,scalingupthetechnologyrequiressignificantcapitalinvestmentandengineeringexpertisetoensurereliableandefficientoperationonalargescale.

Insummary,low-temperatureplasma-catalytictechnologyhasshownpromiseasanovelapproachfortheenvironmentallyfriendlydegradationofVOCs.Thistechnologyoffersseveraladvantagesovertraditionalmethods,includinglowerenergyconsumption,higherefficiency,andlessharmfulbyproducts.Withfurtherdevelopmentandoptimization,thistechnologycouldhaveasignificantimpactonairpollutioncontrol,humanhealth,andwatertreatmentOnepotentialapplicationforlow-temperatureplasma-catalytictechnologyisinthetreatmentofwastewater.Traditionalwastewatertreatmentmethods,suchasactivatedsludgeandbiologicaltreatment,canbeslowandmaynoteffectivelyremovecertainpollutants.Low-temperatureplasma-catalytictechnologycouldofferamoreefficientandeffectivemethodforwastewatertreatment.

Researchhasshownthatlow-temperatureplasma-catalytictechnologycaneffectivelydegradeorganicpollutantsinwater,includingdyesandpharmaceuticals.Theprocessworksbygeneratingplasmainagas-liquidinterface,whichcreatesreactivespeciesthatcanbreakdownpollutants.Theuseofacatalystcanenhancetheefficiencyoftheprocessandallowforthedegradationofmorecomplexpollutants.

Onestudytestedtheuseoflow-temperatureplasma-catalytictechnologyforthedegradationoftheantibioticsulfamethoxazoleinwater.Theresearchersfoundthattheprocesswasabletodegradeover85%ofthesulfamethoxazoleinjust10minutes,withnotoxicbyproductsformed.Thisdemonstratesthepotentialofthistechnologyforthetreatmentofpharmaceutical-contaminatedwastewater.

Inadditiontoitseffectiveness,low-temperatureplasma-catalytictechnologyhasseveralotheradvantagesforwastewatertreatment.Theprocesscanbeeasilyintegratedintoexistingtreatmentsystems,anditdoesnotrequiretheuseofchemicalsorproduceanyharmfulbyproducts.Italsohasthepotentialtobemoreenergy-efficientthantraditionaltreatmentmethods.

Overall,low-temperatureplasma-catalytictech