不同种类致孔剂对水处理聚砜超滤膜污染阻力的影响与分析英文

296201212JOURNALOFNATURALSCIENCEOFHEILONGJIANGUNIVERSITYVol.29No.6December2012EffectsandanalysisofdifferenttypesofporogensonthepolysulfoneultrafiltrationmembranesinwatertreatmentWANGPan-pan1MAJun12LIUQian-liang1SHIFeng-mei11．SchoolofMunicipalandEnvironmentalEngineeringHarbinInstituteofTechnologyHarbin150090China2．Na-tionalEngineeringResearchCenterforUrbanWaterResourcesHarbinInsitituteofTechnologyHarbin150090ChinaAbstractThroughnonsolventinducedphaseinversionNIPSmethodthreedifferenttypesoful-trafiltrationmembraneswiththreedifferentkindsofporogenswerepreparedandthesepore-formingagentsporogenswerePEG－400PVP－K10andcetyltrimethylammoniumbromideCTABrespectively．Theirantifoulingperformancesduringtheultrafiltrationofproteinsolutionwereanalyzedquantitativelyac-cordingtotheresistance-in-seriesmodel．Experimentalresultsshowedthatthethreedifferentkindsofpo-rogenscouldfacilitatethefurtherdevelopmentofporestructuresofpolysulfoneultrafiltrationmembranesandwaterfluxesofpolysulfonemembraneswiththethreekindsofporogenswereallimproved．Duringtheprocessofproteinsolutionthefoulingresistancesofthesethreekindsofpolysulfonemembraneswereallreducedandtheantifoulingperformancewereallenhanced．KeywordspolysulfoneUFmembranepore-formingagentspermeabilityandfoulingCLCnumberO189.1DocumentcodeAArticleID1001－7011201206－0804－07Receiveddate2012－10－19FoundationitemSupportedbytheNationalNaturalScienceFoundationofChina5097806751178134MinistryofScienceandTechnologyofChina2009ZX07424－0062012BAC05B02BiographyMr．WANGPan-pan1982－Ph．D．CandidateinterestedindrinkingwatertreatmentandmembranetechnologyCorrespondingauthorMr．MAJun196[e-mail]-resistanceanalysisofpolysulfoneultrafiltrationmembranesmodifiedbydiffer-enttypesofporogensinwatertreatmentJ．JournalofNaturalScienceofHeilongjiangUniversity2012296804－810．0IntroductionWaterpollutionandscarcityaroundtheworldshavebeengainedmoreandmoreattentionespeciallyinChi-naduetotheescalatedneedandstringentguaranteeofhigh－qualitydrinkingwater．Inpursuitofthesegoalsmembranefiltrationhasbeenconsideredasahighlycompetitivecandidateforthewaterpurificationtechnologyinthecomingdecades1－2．Asweknownpolymericmembranesmostlyadoptedinthefieldofwatertreatmentareusuallypreparedthroughimmersionprecipitationmethodinthenon－solventinducedphaseinversionprocess2－5．Duringtheprocesshomogeneouscastingsolutionofpolymerandorganicsolventisfirstspreadonacleansubstrateglassandthenimmersedinacoagulationbathafterashortperiodofsolventevaporation．Intheabove-mentionedphaseinversionprocessthediffuseexchangeofsolventandnon－solventinducesliquid－liquidphaseseparationformingpolymer－richandpolymer－leanphasespontaneouslyandinturnwecouldgaintheasym-metricmembranewithdenseskinlayerandporoussupportlayer．Unfortunatelyporestructuresintheasymmetricmembranesarecommonlyfurtherdevelopedthroughtheaddi-tionofpore－formingagentsporogensintocastingsolutionwithoutwhichtheporestructuresarenotefficiente-noughtoproduceanabundanceofcleanwater2．CommonlyseriesofpolyvinylpryrrolidonePVPandpolyethy-leneglycolPEGareusedasstrongpore－formingagentsinthepreparationofwaterfiltrationmembranes6．Intheotherhandorganicfoulinghasbeenanobstacleofmembraneprocessinthewaterfiltration7－12．Inthepres-entworkweadoptPEG－400PVP－10KandcetyltrimethylammoniumbromideCTABasthepore－formingagentsinthepreparationofpolysulfoneultrafiltrationmembranesrespectivelyandthencomparethewaterpermea-bilityperformanceofthesemembranes．Importantlyweemphasizeonthefouling－resistanceanalysisofthesemembranesduringthefiltrationprocessofproteinaqueoussolution．1Experimentalsection1.1MaterialsPolysulfoneUdelP－3500asanengineeringpolymerwaspurchasedfromSolvayandusedasmembranematerialsinthecastingsolutionwhile1－methyl－2－pyrrolidoneNMPwasusedascastingsolventanddeion-izedwaterasthecoagulantbathrespectively．PEG－400PVP－10KandCTABwereallsuppliedbySinopharmChemicalReagentCo．Ltd．andadoptedasmembraneadditives．PepsinMw35000waspurchasedfromDong-WuBio－ChemicalProductsCompanyandusedasthemodelpollutantinthefiltrationofaqueoussolution．Allrea-gentswereanalyticalpurificationanduseddirectly．Deionizedwater18.2MΩ·cmwasobtainedfromaMilli－Qultrapurewaterpurificationsystem．1.2ExperimentalprocedureAllthemembraneswerepreparedbyclassicalphaseinversionmethod．Allthebulkmaterialsandadditivesweredriedat80°Cfor12hbeforeuse．DifferingtypesandamountsofadditivesPEG－400PVP－10KandCTABbasedontheweightofcastingsolutionwerefirstlyimpartedintoNMPsolventandthenidentifiedamountofpolysulfone16wt%ofcastingsolutionwascompletelydissolvedthroughheatingstirringintheas－preparedsolution．Afterfullydegassingthecastingsolutionwasspreadontocleanglassplateswith200μmgapandthenimmersedintocoagulationbathdeionizedwaterfor30min．Afterpeelingofffromtheglassplatestheresultantmembraneswererinsedindeionizedwaterbeforeultrafiltrationtests．Duringtheprocessofultrafiltrationtestswaterpermeationofmembraneswasconductedinacross－flowcell．Afterfullcompactionat0.2MPafor30minthewaterfluxwasobtainedfromaverag