第32卷第10期2012年10月环境科学学报ActaScientiaeCircumstantiaeVol.32,No.10Oct.,2012代亚平,吴平霄.2012.3-氨丙基三乙氧基硅烷改性蒙脱石的表征及其对Sr(Ⅱ)的吸附研究[J].环境科学学报,32(10):2402-2407DaiYP,WuPX.2012.CharacterizationofAPTES-modifiedmontmorilloniteandadsorptionofSr(Ⅱ)[J].ActaScientiaeCircumstantiae,32(10):2402-24073-氨丙基三乙氧基硅烷改性蒙脱石的表征及其对Sr(Ⅱ)的吸附研究代亚平,吴平霄?华南理工大学环境科学与工程学院,工业聚集区污染控制与生态修复教育部重点实验室,污染控制与生态修复广东省教育厅重点实验室,广州510006收稿日期:2011-12-13修回日期:2012-02-11录用日期:2012-03-20摘要:3-氨丙基三乙氧基硅烷(APTES)作为偶联剂在粘土功能化方面具有特殊的研究意义.因此,本文采用X射线衍射(XRD)、扫描电镜(SEM)及红外光谱(FTIR)等方法对不同离子交换容量(1.0CEC5CEC、1.0CEC、2.5CEC、2.0CEC、3.0CEC)、4的.APTES改性蒙脱石(APTES-Mt)的结构及表面进行表征与分析,同时对Sr(的Ⅱ)吸附性能进行了研究.结果表明,改性蒙脱石对Sr(的Ⅱ)吸附平衡时间为24h,吸附量随溶液pH(1.0~10.0)的增大而增强,且改性蒙脱石的吸附量是原始蒙脱石吸附量的3倍.改性蒙脱石对Sr(Ⅱ)的吸附作用较强,吸附后的Sr(不Ⅱ)易从材料中解吸出来.XRD、和SEMFTIR等分析结果显示,APTES已经成功插入层间,改性蒙脱石对Sr(Ⅱ)的吸附机理主要为配位吸附.关键词:改性蒙脱石;Sr(Ⅱ);解吸;配位吸附:0253-2468(2012)10-2402-06:X703文献标识码:ACharacterizationofAPTES-modifiedmontmorilloniteandadsorptionofSr(Ⅱ)?DAIYaping,WUPingxiaoTheKeyLaboratoryofPollutionControlandEcosystemRestorationinIndustryClusters,MinistryofEducation,theKeyLaboratoryofEducationinGuangdongProvinceforPollutionControlandEodogicalRestoration,CollegeofEnvironmentalScienceandEngineering,SouthChinaUniversityofTechnology,Guangzhou510006Received13December2011;receivedinrevisedform11February2012;accepted20March2012Abstract:Asafunctionalcouplingagent,3-aminopropyltriethoxysilane(APTES)playsanextremelyimportantroleinclayfunctionalization.Inthisstudy,thestructureandsurfacepropertyofmontmorillonitemodifiedbyAPTESwithdifferentionexchangecapacity(1.0CEC,1.5CEC,2.0CEC,25CEC,．3.0CECand4.0CEC)wascharacterizedbyFouriertransforminfraredspectroscopy,X-raydiffractionanalysis,andScanningElectronMicroscopy,respectively.TheadsorptionpropertiesofSr(II)byAPTESwasalsoanalyzed.TheresultsindicatedthatsorptioncapacityincreasedwithincreasingpH(1.0~10.0),andreachedbalanceafter24h.ThemaximumadsorptioncapacityofAPTES-modifiedmontmorillonitewas3thatofrawmontmorillonite.Moreover,thedesorptionratesofAPTES-modifiedmontmorillonitewasveryloThecharacterizationresultsofXRD,SEMandFTIRrevealedthatAPTESwasintercalatedintothelayerofmontmorillonite.ThemechanismofSr(II)adsorptionwasmainlycoordination.Keywords:modifiedmontmorillonite;Sr(Ⅱ);desorption;coordination1引言(Introduction)到环境中,从而对人体产生相当大的危害,特别是锶-90(发射β射线,半衰期为28年),很容易在人由于工业研究应用等原因,放射性锶会被释放体器官中累积并形成放射性骨骼(Karasyovaetal.,基金项目:国家自然科学基金项目(No.41073058,40973075);广东省科技计划项目(No.2006B36601004,2008B030302036);高等学校博士学科点专项科研基金资助(No.20100172110028);广东省自然科学基金团队项目(No.9351064101000001)SupportedbytheNationalNaturalScienceFoundationofChina(No.41073058,40973075),theScienceandTechnologyProgramofGuangdongProvince(No.2006B36601004,2008B030302036),theHigherSpecializedResearchFundfortheDoctoralProgram(No.20100172110028)andtheTeamProjectoftheNaturalScienceFoundationofGuangdongProvince(No.9351064101000001)作者简...