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《有机硅修饰的剥层水滑石及其对废水中金属离子的吸附.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第29卷第4期无机化学学报V01.29No.42013年4月CHINESEJ0URNALOFINORGANICCHEMISTRY817—825有机硅修饰的剥层水滑石及其对废水中金属离子的吸附赵秀巧1董丽君1操越1莫士净1义建军,2徐庆红,1(北京化工大学化工资源有效利用国家重点实验室,北京100029)(中国石油天然气集团公司石油化学研究院,北京100083)摘要:对剥层的镁铝硝酸根水滑石(Mg2Al—NO3一LDHs)~表面进行了有机硅化合物(Ⅳ_(2一Aminoethy1)-3-aminopropy1
2、)tris一(2一ethoxy)silane(KH一791)~i,并研究了修饰后的水滑石片对废水中Pb“,Cu和Zn离子的吸附行为。结果表明:在相同的温度和金属离子浓度条件下,被修饰的水滑石片对Pb吸附容量最大,达到378.0mg·g一;在以上几种金属离子的混合溶液中,修饰主体材料表现出对Pb“高度的选择性吸附,对Pb“吸附容量为85nag·g~,而对Zn“和C的吸附容量只有30nag·g-左右。关键词:吸附;表面及内表面;化学动力学平衡;剥层水滑石中图分类号:0614文献标识码:A文章编号:1001—4
3、861(2013)04.0817—09DOI:10.3969~.issn.1001—4861.2013.00.137ExfoliatedLDHsModifiedwithOrganicSiliconRegentandTheirAdsorptiontoMetalIonsfromWastewaterZHAOXiu—QiaoDONGLi—JunCAOrueMOShi-JingYIJian-Jun,XUQing—Hong'(StateKeyLaboratoryofChemicalResourceEngineerin
4、g,BeijingUniversityofChemicalTechnology,Beijing100029,China)(ZPetrochemicalResearchInstitute,PetroChinaCompanyLimited,Beijing100083,China)Abstract:Thisworkstudiesmodifiedexfoliatedlayereddoublehydroxides(MgzAl—N03-LDHs)withN一(2一aminoethy1)-3·aminopropyhri
5、ethoxysilane[(CH3CH2O)3Si(CH2)3NH(CH2)2NH2,KH一791】bycovalentbonding,anditsselectiveadsorptiontoPb。CuandZnionsfromaqueoussolutions.TheadsorptioncapacityforPb,Cu,andZnwasmonitoredbyatomicabsorptiontechniqueatdifferentmetalconcentrationsandtemperatures.Resul
6、tsindicatethatPbionhaslargerabsorptioncapacityonthemodifiedexfoliatedMg2Al—N03-LDHs(EM-LDHs)thanthatofCuandZnionsunderthesameinitialconcentrationandtemperature.ComparedwithPbion.theadsorptionforCuorZnioniSlesswhentheinitialconcentrationiS500Ixg·mL~.Theinf
7、luenceoftemperatureonadsorptiontoPbionbyEM.LDHsiSmoresignificantthanthatofCu2+andZn2+ions.Keywords:adsorption;surfaceandinterfaces;chemicalkineticsandequilibrium;exfoliatedLDHWaterpollutionbytoxicheavymetalsduetotheseparation,ionexchange,adsorptionofchemi
8、calrandomdischargesremainsanimportantenvironmentalprecipitationcoagulation-flocculation,andadsorptionandpublicissueassociatednegativelywiththehealthhavebeendevelopedtocircumventtheseriousandeconomy【lJ.Aseriesofenvir
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