不同水环境对纳米银颗粒聚集体粒径大小及界面电势的影响_英文_VIP专享VIP免费

收稿日期：2011-10-22。收修改稿日期：2011-12-10。广西省教育厅(No.2010101X536)资助项目。＊通讯联系人。E-mail：hongyin1983@gmail.com不同水环境对纳米银颗粒聚集体粒径大小及界面电势的影响张红印1陈少峰＊,2林庆宇3(1罗德岛大学土木与环境工程系，金士顿02881，美国)(2茂名职业技术学院化学工程系，茂名525000)(3贺州学院化学与生物工程系，贺州542800)摘要：研究了不同水环境对无稳定剂与PVP为稳定剂的纳米银颗粒的物化性能的影响。结果表明：随着电解质浓度的增加，纳米银颗粒的粒径与界面电势逐步增大；二价阳离子比一价阳离子更能有效地使纳米银粒径与界面电势增加；稳定剂PVP，腐植酸及其他天然有机物能够增加纳米银溶胶的稳定性；在天然水体中，纳米银在海水中的粒径颗粒与界面电势比湖水中更大。关键词：纳米银；稳定剂；粒径；界面电势中图分类号：614.122文献标识码：A文章编号：1001-4861(2012)04-0833-06EffectofWaterConditiononParticleSizeandζ-PotentialofSilverNanoparticlesZHANGHong-Yin1CHENShao-Feng2,＊LINQing-Yu3(1DepartmentofCivilandEnvironmentalEngineering,UniversityofRhodeIsland,Kingston,02881,USA)(2DepartmentofChemicalEngineering,MaomingVocationalTechnicalCollege,Maoming,Guangdong525000,China)(3DepartmentofChemicalandBiologicalEngineering,HezhouUniversity,Hezhou,Guangxi542800,China)Abstract:Thisstudyevaluatestheeffectofwaterconditiononthephysicochemicalpropertiesofsilvernanoparticles(AgNPs)with/withoutcappingagent.TheresultsshowthattheaverageparticlesizeofAgNPsincreaseswithincreasinginelectrolyteconcentration.Divalentcation(Ca2+)canmoreeffectivelyincreasethesizeandζ-potentialofAgNPaggregatesthanmonovalentcation(Na+).ThisstudyalsoindicatesthatPVP,humicacidornaturalorganicmatterscanincreasethestabilityofAgNPsuspension.LargerAgNPsaggregatesareformedinseawaterthaninlakewater.Keywords:silvernanoparticles;cappingagents;particlesize;ζ-potential0IntroductionSilvernanoparticles(AgNPs)arewidelyusedbecauseoftheirantimicrobialproperties.ConsumerproductscontainingAgNPsaccountedformorethan25%ofthetotal1,317nanotechnology-basedconsumerproductsavailableonthemarketin2009[1].AgNPscanbesynthesizedbyphysicalorchemicalmethod.Sharmaetal.[2]introducedtheTollensmethodwhichinvolvesthereductionofAg(NH3)2inaqueousTollensreagentbyanaldehydesuchassaccharides.Duringthesynthesisprocess,cappingagentsareusuallyusedtocreateastableAgNPsuspension[2-4].Amongallthecappingagents,polyvinyl第28卷第4期2012年4月Vol．28No．4833-838无机化学学报CHINESEJOURNALOFINORGANICCHEMISTRY第28卷无机化学学报pyrrolidone(PVP)isfrequentlyusedduetoitsgoodstabilizingeffectandlowtoxicity[2-3].PreviousstudiesindicatethatthestabilityofAgNPsuspensionstabilizedwithPVPisbetterthanthatstabilizedwithsodiumcitrate[5].RecentstudiesshowthatwaterchemistrycaninfluencethephysicochemicalpropertiesofAgNPs.Forinstance,Gaoetal.[6]suggestedthatwaterconditionsofhighionicstrengthformlargeaggregates.ItisalsoreportedthatthesizeofAgNPsaggregatescaninfluencetheirtoxicity.Forexample,largerAgNPsaggregatesexhibitlowertoxicityonbacteriaandhumancellscomparedtosmallerAgNPsaggregates[7-8].However,fewresearchstudieshavecomparedthestabilityofAgNPswith/withoutcappingagentsintermsofparticlessizeandζ-potentialindifferentelectrolytesolutions.Inthiswork,AgNPswithoutcappingagent(“naked”AgNPs)andwithPVPascappingagentweresynthesizedviaTollensmethod.PVPstabilizedAgNPswereselectedbecausePVPisanenvironmentallyfriendlypolymericcoatingandfrequentlyusedbyotherresearchersforAgNPscharacterizationandantimicrobialactivit...