Impact of TiO2 nanoparticles on morphology and performance of crosslinked

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1、JournalofMembraneScience343(2009)189–198ContentslistsavailableatScienceDirectJournalofMembraneSciencejournalhomepage:www.elsevier.com/locate/memsciImpactofTiO2nanoparticlesonmorphologyandperformanceofcrosslinkedpolyimideorganicsolventnanofiltration(OSN)membran

2、esIwonaSoroko,AndrewLivingston∗DepartmentofChemicalEngineeringandChemicalTechnology,ImperialCollegeLondon,ExhibitionRoad,LondonSW72AZ,UKarticleinfoabstractArticlehistory:Chemicallycrosslinkedpolyimideorganic–inorganiccompositenanofiltrationmembranessuitableRec

3、eived19February2009forapplicationinharshorganicsolventsweresuccessfullypreparedbyphaseinversionofdopeReceivedinrevisedform25June2009solutions.TiO2nanoparticlesweredispersedinthesedopesolutions,comprisingpolyimide(PI)inN,N-Accepted14July2009dimethylformamide/1

4、,4-dioxane.TheimpactofTiO2ontheresultingPImembraneswasinvestigatedAvailableonline22July2009usingSEM,TGA,watercontactangle,dopeviscositymeasurementsandmechanicalstrength.ThepresenceofTiO2nanoparticleswithinthemembranematrixwasprovedbythedetectionofapeakcharact

5、eristicofKeywords:TiO2intheWAXSpattern.SEMpicturesofthecross-sectionofthePI/TiO2membranesshoweddramati-PolyimidecallychangedmorphologycomparedtoreferencemembraneswithnoTiO2addition.MacrovoidspresentMembraneTiO2nanoparticlesinreferencemembranesweresuppressedby

6、increasingloadingofTiO2nanoparticles,andeventuallydis-Organicsolventnanofiltration(OSN)appearedcompletelyataTiO2loadingabove3wt.%.DecreasingwatercontactangleandanincreaseinMacrovoidsethanolfluxindicatedthathydrophilicityincreasedasnanoparticleloadingincreased.T

7、heeffectofTiO2onthefunctionalperformanceofthemembraneswasevaluatedbymeasuringfluxandrejectionusingcross-flowfiltration.Perhapssurprisingly,thepresenceofTiO2improvedthecompactionresistanceofthemembranes,whereasrejectionandsteadyfluxwerealmostunaltered.©2009Elsevie

8、rB.V.Allrightsreserved.1.Introductionmostimportantfactorcontrollingtoplayerstructure.ThestructureofthesupportingsublayerisaffectedbothbythelocalcompositionOrganicsolventnanofiltration(OSN)