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脉冲放电等离子体-催化耦合降解室内甲醛的研究.docx

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脉冲放电等离子体-催化耦合降解室内甲醛的研究 摘要： 甲醛是一种常见的室内空气污染物，对人体健康产生负面影响。其中，脉冲放电等离子体技术因其高效、无公害等特点而成为去除甲醛的重要手段。本文采用脉冲放电等离子体催化耦合降解甲醛，在实验室中对比不同实验条件下的甲醛去除效果，探究其去除机理。结果表明，脉冲放电等离子体催化耦合技术能在室内空气中高效去除甲醛，其去除率可以达到90%以上。同时，研究发现氧化还原反应、吸附反应和氧化反应都是去除甲醛的重要反应机理。本研究提供了一种高效、无公害的去除室内甲醛的方法，具有重要的实际应用价值。 关键词：脉冲放电等离子体；催化耦合；降解；甲醛；室内空气污染 Introduction Formaldehydeisacommonindoorairpollutantthatcanhaveanegativeimpactonhumanhealth.Long-termexposuretohighlevelsofformaldehydecancauserespiratoryproblems,eyeirritation,andevencancer.Therefore,itisimportanttofindanefficientandenvironmentallyfriendlywaytoremoveformaldehydefromindoorair. Pulseddischargeplasmatechnologyhasattractedincreasingattentioninrecentyearsduetoitshighefficiencyandlowpollution.Comparedwithtraditionalairpurificationtechnologiessuchasactivatedcarbonandventilation,pulseddischargeplasmatechnologyhastheadvantagesofhighefficiency,lowenergyconsumption,andgoodstability.Inthisstudy,weexploredtheeffectivenessandmechanismofpulseddischargeplasma-catalysiscoupledtechnologyinremovingformaldehydefromindoorair. MaterialsandMethods Theexperimentalapparatusconsistedofaplasmadischargereactor,acatalyticreactor,afan,andaformaldehydemeasurementinstrument.Theplasmadischargereactorcontainedadielectricbarrierdischarge(DBD)device,whichwasusedtogeneratepulseddischargeplasma.ThecatalyticreactorcontainedacatalystbedmadeofTiO2nanotubes.Theformaldehydemeasurementinstrumentwasusedtomeasuretheconcentrationofformaldehydeaftertreatment. Thepulseddischargeplasmawasgeneratedbyapplyingahighvoltagetotheelectrodesinsidetheplasmadischargereactor.Thecatalyticreactorwasplaceddownstreamoftheplasmadischargereactor.Theaircontainingformaldehydewaspumpedintotheplasmadischargereactor,whereitwastreatedbythepulseddischargeplasma.Then,thetreatedairflowedintothecatalyticreactor,whereitwasfurthertreatedbythecatalyst.Thetreatedairwasfinallyreleasedintotheatmosphere. Inthisexperiment,wevariedseveralparameterstostudytheireffectsonformaldehyderemovalefficiency,includingthedischargevoltage,thedistancebetwe