第23卷第2期2023年2月过程工程学报TheChineseJournalofProcessEngineeringVol.23No.2Feb.2023Applicationofultra-thinePTFEnanofibrousmembranesinhigh-efficientremovalofPM2.5FengLIU,HongmiaoWU*,ShenguiJU,ZhaoxiangZHONG,WeihongXINGStateKeyLaboratoryofMaterials-OrientedChemicalEngineering,MembraneScienceandTechnologyResearchCenter,NanjingTechUniversity,Nanjing,Jiangsu210009,ChinaAbstract:Recently,expandedpolytetrafluoroethylene(ePTFE)nanofibrousmembraneshavereceivedextensiveattentioninthetreatmentoffineparticulatematter(PM2.5).Butuntilnow,theinfluenceofmembranestructureonthePM2.5filtrationprocessisstillunder-investigated.Andtheapplicationofultra-thinePTFEnanofibrousmembraneinthetreatmentofPM2.5ofmedium-highconcentrationhasreceivedlittlereportyet.Therefore,threekindsofultra-thinePTFEnanofibrousmembraneswithparticle/membranesizeratio(dP/dm)rangingfrom0.86to4.46andmembranethickness≤1μmwerechosentoexaminethePM2.5filtrationperformanceatmediumtohighconcentration(200~1000mg/m3).AllthethreemembranesshowedhighPM2.5filtrationefficiencies(>99.5%)andlowinitialpressuredrop(30~130Pa)benefitfromtheultra-thinfew-layeredcrosslinked-network-likestructures.Inaddition,thesurfacesofePTFEmenbranesweresmoothwithroughnesscommonlylessthan1μm,whichreducedtheadhesionofthecakelayerandhencemadeitpronetofalloff.Asaresult,themembraneexhibitedgoodregenerationperformanceina4-cycleregenerationexperiment.FromthecomparisonofthethreenanofibrousePTFEmembranes,itshowedtheonewiththelowestdP/dmratio(0.86)providedthelowestfiltrationpressuredrop(30Pa)aswellasexcellentfiltrationefficiency(99.93%)andgoodregenerationperformance.Butfurtherincreasingthemembraneporesizemayleadtomoreseriouspore-pluggingandlowerfiltrationefficiencywhichhadfatalimpactsonthePM2.5filtrationperformance.Insummary,theultra-thinePTFEnanofibrousmembraneexhibitedsuperiorcomprehensiveperformanceinfiltrationofPM2.5atmediumtohighconcentrationwhichshowedabroadapplicationprospectsinairpurification.Keywords:ePTFE;ultra-thin;nanofibrousmembrane;PM2.5Cle...
