IO203Highfluxreverseosmosismembranespreparedbyinco

HighfluxreverseosmosismembranespreparedbyincorporatingnanoparticleLinZhang*,HangDong,XinyingQu,ShiQiu,GuozhongShi,HuanlinChen,DepartmentofChemical&BiologicalEngineering,EngineeringResearchCenterofMembraneandWaterTreatmentTechnology,MOE,ZhejiangUniversity,Hangzhou,310027,P.R.ChinaZeoliteandcarbonnanotube(CNT)areknownasgoodwaterchannel,andithasbeenprovedthatzeolitenanocrystalcanimprovewaterfluxbyincorporatingNaAzeoliteinpolyamide(PA)membrane.However,themechanismofnanocompositemembraneformationisnotclear,andthereisnoreportaboutROmembranewithCNT.Inthiswork,PAthinfilmnanocomposite(TFN)reverseosmosismembranesarefabricatedbyinterfacialpolymerizationoftrimesoylchloride(TMC)andm-phenylenediamine(MPD)monomersinthepresenceofNaAzeolitenanocrystalormulti-walledcarbonnanotubes(MWNTs).TheeffectofintroducingNaAzeolitenanocrystalviatheaqueousphaseortheorganicphaseonthemembranemorphologyandsurfacepropertiesisinvestigated.Thedesalinationperformancesofthesesmembranesaremeasured,andwhenthezeoliteloadingexceeded0.1wt%inorganicphase,adoubledfluxandincreasedrejectionareobtained,whichissuperiortothemembranewithzeoliteaddedinaqueousphase.Basedonaboveresults,themembraneformationmechanismisproposed.TheMWNTweretreatedbymixedacid(H2SO4/HNO3=3/1)toyieldacidifiedMWNTswith-COOHand-OHgroups,andthenMWNTs-polyamidereverseosmosisnanocompositemembranesweresynthesizedbyinterfacialpolymerizationbetweenTMCandMPDwithfunctionalizedMWNTsdispersedinaqueousphase.TheresultsshowedthatthewaterfluxofMWNT-polyamidemembranesdramaticallyimproved,thewaterfluxofthinfilmnanocompositemembranewith0.1%(m/v)acidifiedMWNTswasalmost2.8timesthatofbarepolyamidemembrane.Keywords:Reverseosmosismembrane;nanoparticle;Zeolite;carbonnanotube;polyamide                                                             * Correspondingauthor:[e-mail];[phone]