Interfacial polymerization of thin film nanocomposites: A new concept for reverse osmosis membranes

收藏 评价 举报

• 分享

作者：AlbertoTiraferria,KaiLoonChenb,RajandreaSethia,MenachemElimelechb　　（aDITAGDipartimentodiIngegneriadelTerritorio,dell’AmbienteedelleGeotecnologie,PolitecnicodiTorino,CorsoDucadegliAbruzzi,24,10129,Torino,Italy　　bDepartmentofChemicalEngineering,EnvironmentalEngineeringProgram,YaleUniversity,NewHaven,CT06520-8286,USA）　　摘要：Injectionofnanoscalezero-valentiron（NZVI）ispotentiallyapromisingtechnologyforremediationofcontaminatedgroundwaters.However,theefficiencyofthisprocessissignificantlyhinderedbytherapidaggregationoftheironnanoparticles.Theaimofthisstudywastoenhancethecolloidalstabilityofthenanoparticlesthroughtheadditionofthe“green”polymerguargum.Weevaluatedthepropertiesofguargumanditsinfluenceonthesurfaceproperties,particlesize,aggregation,andsedimentationofironnanoparticles.Commercialironnanoparticlesweredispersedinguargumsolutions,andtheiraggregationandsedimentationbehaviorswerecomparedtothoseofbareironnanoparticlesandcommercialnanoparticlesmodifiedwithabiodegradablepolymer（polyaspartate）.Highperformancesizeexclusionchromatography,chargetitration,andviscosityassessmentshowedthatguargumisahighmolecularweightpolymerwhichisnearlyneutrallycharged,renderingitsuitableforstericstabilizationoftheironnanoparticles.Electrophoreticmobilitymeasurementsdemonstratedtheabilityofguargumtoadsorbonthenanoparticles,formingaslightlynegativelychargedlayer.Dynamiclightscatteringexperimentswereconductedtoestimatetheparticlesizeofthedifferentnanoparticlesuspensionsandtodeterminetheaggregationbehavioratdifferentionicstrengths.Guargumeffectivelyreducedthehydrodynamicradiusofthebarenanoparticlesfrom500nmtolessthan200nmandpreventedaggregationofthenanoparticlesevenatveryhighsaltconcentrations（0.5MNaCland3mMCaCl2）.Sedimentationprofilesofthedifferentnanoparticlesuspensionsconfirmedtheimprovedstabilityoftheironnanoparticlesinthepresenceofguargum.Theresultsstronglysuggestthatguargumcanbeusedtoeffectivelydeliverstabilizedzero-valentironnanoparticlesforremediationofcontaminatedgroundwateraquifers.　　关键词：Zero-valentironnanoparticles;Guargum;Greenpolymers;Aggregation;Stericstabilization;Groundwaterremediation;DLS;Particlesize
标签：

• Interfacial polymerization of thin fil

  Interfacial polymerization of thin film nanocomposites

• Thin Film Stress Measurement Using Dek

  Thin Film Stress Measurement Using Dektak Stylus Pro

• Nanoindentation of a 10-nm-thick thin

  Nanoindentation of a 10-nm-thick thin film.pdf

• Interactions control领 biopolymer fou领

  Interactions control领 biopolymer fou领 of reverse osmos

• Interfacial silica nanoparticles stabi

  Interfacial silica nanoparticles stabilize cocontinu

• Impedance Characterization of the Film

  Impedance Characterization of the Film Formation Pro

• Accelerating the Living Polymerization

  Accelerating the Living Polymerization of

• Isothermal Microcalorimetry: A New Too

  Isothermal Microcalorimetry: A New Tool for Biomateria

• Filter Pressure Value Test (FPV test)

  Filter Pressure Value Test (FPV test) - a new

• Degradation tests A new test procedure

  Degradation tests A new test procedure to examine p