Acces Full Source Department of Environmental：訪問完整的源環(huán)境部

evaluationofactivatedcarbonfibersforremovalofvolatileorganiccompoundsinindoorenvironmentshuajunluneilzimmermanphdcihpurdueuniversityschoolofhealthsciencesoct.,17th,2003overviewintroductionofindoorairquality(iaq)purposesofstudymaterialsandmethodstheoreticalbackgroundresultsconclusionsiaqbackground

indevelopingcountries,useofbiomassfuelsforcookingandheatingresultin2milliondeathannually.associatedwithadversepregnanciesincreasetheriskofyoungchild’sseriousrespiratoryinfectionone-halfofu.sschoolshaveproblemslinkedtoindoorairqualityproblemsranksamongtopfiveenvironmentalriskstopublichealth

lostproductivityestimated$60billionperyearsourcesofconcernforiaqinadequateventilationhazardousgasessuchasco,nox,etc.formaldehyderespirableparticlespesticidesbiologicalcontaminantsbacteriamoldvirusespollenvolatileorganiccompounds(vocs)

adsorptionadsorptionistheprocessoftrappinggasandvapormoleculeswithintheporesofamicroporoussolidsuchasactivatedcarbon.influencefactorssurfaceinteractionsbetweenadsorbateandadsorbentsurfaceareaofadsorbateporesizeofadsorbateadsorptionmediaalumina/potassiumpermanganatezeolite(molecularsieve)granularactivatedcarbon(gac)activatedcarbonfiber(acf)whyacf?comparedtogac,acfhasthefollowingadvantages:greatlyimprovedcontactefficiencywithadsorbatesleadingtogreaterratesofadsorption,superiorbreakthroughcapacityandexcellentadsorptionpropertiestolowconcentrationofcontaminants(yue,etal.,2001).availabilityoffeltorfabricforms:occupyingsmallerspaceelectricalreactivation:savingreactivationcost(suzuki,1994,economyandlin,1976).

whatdoesthefiberlooklike?typicalsemmicrographofacf-15

dia.=16m

reference:foster,k.l.,doctoraldissertation,uiuc,il,1993typicalsurfaceimageofsinglefiberreference:foster,k.l.,doctoraldissertation,uiuc,il,1993

typicalcross-sectionimageofsinglefiberreference:foster,k.l.,doctoraldissertation,uiuc,il,1993purposesofstudytodetermineadsorptionanddesorptionparametersforselectedvocsonacfandtypicalindoormaterials;toestablishaniaqmodelbasedonthesinkeffectsofindoormaterialsandadsorptionbyacfmaterialsandmethods---chambertestsystemchamberdiagram

incomingairoutgoingairinjectionportfanmaterialsandmethods---testchemicalstestmaterialstestmaterials:cotton:100%cottonclothcarpet:polyesterwallboard:goldbond?regulargypsumboardwith100%paperinbothsides,12.7mminthicknessacfsurfacearea(m2/g)acf-10738acf-151390acf-201600

reference:foster,k.l.,etal.,chem.mater.,4:1068-1073,1992

mangun,c.l.,etal.,chem.mater.11,3476-3483,1999samplingstrategiessamplingandanalysisofsamplessamplingintervalsvaryfrom3minutesto3hourssamplingtimerangesfrom1minutesto10minutessamplingflowrate:80ml/minactivesamplingwithactivatedcoconutcharcoaltubescs2asdesorbergaschromatography/flameionizingdetectormodeldevelopment

adsorptionmaterialschamberinteriorsurfacesiaqmodelforemptychamber:withinitialconditions:c0=ce,m0=meforchamberwithacforindoormaterials:

initialvalues:t=0,c0=0,m1=0,m2=0equationsforpredictionofadsorptioncapacityfreundlichisothermequation:

where:m-----themassofadsorbateadsorbedperunitadsorbent,mg/gc-----concentrationinbulkgasphasek,n---empiricalconstantsdubinin-radushkevich

equation:

where:v----volumeoftheadsorbateadsorbedattemperaturet,cm3/gv0----totalactivevolumeofacf,cm3/ga----rt*ln(p0/p),adsorptionpotential,j/mol,p0,saturationvaporpressure,p,partialpressureofadsorbateatequilibriumβ----affinitycoefficient,withrespecttobenzeneinthisprojecte0----characteristicadsorptionenergy

staticacfadsorptionprofileoftoluenefreundlichisotherm—log-transformationfreundlichisothermparametersfreundlichequationafterlog-transformationdubinin-radushkevichisothermdubinin-radushkevichisothermparametersacfadsorption--dynamictestinchambersinkstrengthsofindoormaterialsconclusionsforacfstaticadsorptionoftoluene,thecorrelationcoefficientsfortheexperimentaldatawere>0.97basedonbothfreundlichanddubinin-radushkevichequations.foracfstaticadsorption,theadsorptioncapacitycorrelateswithsurfacearea,andporesizedistribution.amongtestedindoorbuildingmaterials,carpethasthegreatestadsorptioncapacityfortoluene.qualitativelyspeaking,acfhassignificantlygreater