羧甲基化沙柳木粉负载纳米零价铁吸附水中pb2+

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1、羧甲基化沙柳木粉负载纳米零价铁吸附水中Pb2+扈佳琪*，王丽（内蒙古农业大学材料科学与艺术设计学院，内蒙古呼和浩特010018）摘要：以羧甲基化沙柳木粉（CMS）为载体，采用液相还原法制备羧甲基化沙柳木粉负载纳米零价铁（NZVI/CMS）吸附剂。采用SEM、FTIR、XRD和TEM对纳米零价铁（NZVI）和NZVI/CMS的微观结构进行了表征。考察了不同吸附条件对NZVI和NZVI/CMS吸附Pb2+性能的影响。表征结果显示：NZVI成功负载在CMS上，负载后的NZVI的分散性明显提高，团聚现象得到有效解决，CMS起到分散NZVI颗粒的作用。吸附结果显示：当NZVI和N

2、ZVI/CMS的投加量分别为0.05g和0.01g，Pb2+初始质量浓度分别为600mg/L和400mg/L，吸附时间为120min，吸附温度为30℃，Pb2+溶液pH值分别为4.5和4.0时，NZVI和NZVI/CMS对Pb2+的吸附量最大，分别为390.30mg/g和535.50mg/g。循环吸附实验表明，NZVI的吸附量从第一次的390.3mg/g下降到第四次的98.6mg/g，NZVI/CMS的吸附量从第一次的535.5mg/g下降到第四次的469.7mg/g，NZVI/CMS呈现出比NZVI更优越的循环使用性能。关键词：沙柳；纳米零价铁；吸附；还原；Pb2+中

3、图分类号：X52文献标识码：AAdsorptionPropertiesofPb2+inAqueousSolutionbyCarboxymethylSalixPsammophilaPowderSupportedNanoscaleZero-ValentIronHUJiaqi*,WANGLi(CollegeofMaterialScienceandArtDesign,InnerMongoliaAgriculturalUniversity,Hohhot010018,InnerMongolia,China)Abstract:Thecarboxymethylsalixpsammoph

4、ilapowder(CMS)ascarrier,thecarboxymethylsalixpsammophilapowdersupportednanoscalezero-valentiron(NZVI/CMS)waspreparedbyusingliquidphasereductionmethod.Themicrostructuresofnanoscalezero-valentiron(NZVI)andNZVI/CMSwerecharacterizedbymeansofSEM,FTIR,XRDandTEM.Theeffectsofdifferentadsorptionc

5、onditionsonadsorptionpropertiesofNZVIandNZVI/CMSforPb2+werestudied.ThecharacterizationresultsshowthatNZVIwasloadedontheCMSsuccessfully,andtheNZVIwerescatteredobviouslyonCMS,reunionphenomenonhadbeenresolvedeffectively,CMSplayedaroleindispersingNZVIparticles.Theadsorptionresultsshowedthatt

6、headsorptioncapacitiesofNZVIandNZVI/CMSreachedamaximumof390.30mg/gand535.50mg/gasthedosagewas0.05gand0.01grespectively,theinitialmassconcentrationofPb2+was600mg/Land400mg/Lrespectively,theadsorptiontimewas120min,theadsorptiontemperaturewas30℃andthepHofPb2+solutionwas4.5and4.0respectively

7、.Thecyclicadsorptionexperimentsshowthat,theadsorptioncapacitiesofNZVIdecreasedfrom390.3mg/gto98.6mg/g,theadsorptioncapacitiesofNZVI/CMSdecreasedfrom535.5mg/gto469.7mg/g,NZVI/CMShasbetterreusabilitythanthatofNZVI.Keywords:salixpsammophila;nanoscalezero-valentiron;adsorptio