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:2002-01-29.:,,1969,,.:.Tel:(025)4315522;Fax:(025)4315518;E-mail:ljwang@public1.ptt.js.cn.:(2002005).:0253-9837(2002)05-0453-04李健生,孙秀云,刘晓东,王连军(南京理工大学化工学院,江苏南京210094):A-Al2O3C-Al2O3.X.,,.,,.700e013014MPa/1113311139,Knudsen.,22819m2/g,415nm.:,,,:O643/TQ11:APreparationofAluminaHollowFiberUltrafiltrationMembranebyFilteringCoatingLIJiansheng,SUNXiuyun,LIUXiaodong,WANGLianjun*(SchoolofChemicalEngineering,NanjingUniversityofScienceandTechnology,Nanjing210094,Jiangsu,China)Abstract:ThefilteringcoatingmethodwasintroducedtoprepareC-Al2O3ultrafiltrationmembraneusingA-Al2O3hollowfibermicrofiltrationmembraneassubstrate.Thethermostability,phasetransformation,structureandappearanceofultrafiltrationmembranewerecharacterizedbythermogravimetricanalysis,differentialther-malanalysis,X-raydiffractionandscanningelectronmicroscopy,respectively.TheresultsshowedthattheC-Al2O3ultrafiltrationmembranewithsupportpreparedbyfilteringcoatingmethodisdefect-free.Themembraneisofgasselectivity,andtheseparationfactorsofnitrogentoargonare11133and11139at013and014MPare-spectively.ItwasshowedthatthegasdiffusionthroughthemembraneisgovernedbyKnudsendiffusionmecha-nism.Themostprobableporediameterofanunsupportedmembraneaftercalcinationat700eisabout415nmanditsspecificsurfaceareais28219m2/gcharacterizedbynitrogenisothermaladsorptionmeasurement.Keywords:filteringcoating,hollowfiber,alumina,ultrafiltrationmembrane,[1].2090,[2~6].A-Al2O3[7].C-Al2O3.(2~3mm),;,(012mm),,[1].,A-Al2O3C-Al2O3,.11.1,10g,80e100ml,,,80e,235Vol.23No.5ChineseJournalofCatalysis20029September2002,8~12h,,pH317.50ml3%PVA,..(1),,,5min,.(2),115m.,,,,5min,,.1.1Fig1Schematicdiagramforfilteringcoating3Fig3SEMphotographsofhollowfibersupportedmembranepreparedbydipcoating(a)Surface,(b)Cross-section,,.115e/min700e2h,C-Al2O3.1.2(TGA-50),(DTA-50),X(BrukerD8),(JSM-6300),(CoulterSA3100),().22.1TG-DTA2,DTA3,TG3.87e,TG15%;234e;404eC-Al2O3,TG14%;510e,.2TG-DTAFig2TG-DTAcurvesofboehmitexerogel2.2SEM3.,700e2h,,.,.,45423.4.,,,018Lm,.,.,.,,,,,.,.4Fig4SEMphotographsofhollowfibersupportedmembranepreparedbyfilteringcoating(a)Surface,(b)Cross-section2.3XRD52hXRD.,350e,C-AlOOH;400e,C-AlOOHC-Al2O3;400~700e,C-Al2O3,,,,,.TG-DTA.5XRDFig5XRDpatternsofxerogelcalcinedatdifferenttemperaturesfor2h(1)300e,(2)350e,(3)400e,(4)700e2.4C-Al2O3,,[8].BET700e2hC-Al2O322819m2/g.6700e2h.,,415nm,10nm81123%,,(Scher-rer,700e2hC-Al2O34nm),.6Fig6Poresizedistributionofunsupportedmembrane2.5,.7A-Al2O3C-Al2O3.4555:,,Knudsen.C-Al2O3,1717,Knudsen,C-Al2O3.,C-Al2O3,.7C-Al2O3Fig7N2permeabilityofhollowfibersupportandC-Al2O3ultrafiltrationmembranewithsupportasafunctionofpressuredifference(1)Support,(2)Membranewithsupport8C-Al2O3.,,.,400e013MPaA=11161,014MPaA=11183,(A=11194).Knudsen.,700e400e,.700e013MPaA=11133,014MPaA=11139.,,,.8C-Al2O3Fig8GasseparationpropertyofC-Al2O3hollowfiberultrafiltrationmembrane(1)700e,N2;(2)700e,Ar;(3)400e,N2;(4)400e,Ar1.(WangGY.JInorgMater),1993,8(3):2572LeeKH,KimYM.KeyEngMater,1991,61/62:173SmidJ,AvciCG,G&unayV,TerpstraRA,VanEijkJPGM.JMembrSci,1996,112(1):854TanXY,LiuShM,LiK.JMembrSci,2001,188(1):875KuraokaK,AmakawaR,MatsumotoK,YazawaT.JMembrSci,2000,175(2):2156LiuShM,TanXY,LiK,HughesR.JMembrSci,2001,193(2):2497,,,.(LiJSh,HaoYX,WangLJ,ZhaoBCh.ChinJCatal),2001,22(5):4378,,,.(XiaChR,GaoJF,PengDK,MengGY.JInorgMater),2001,16(1):188(EdWGZh)45623