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《疏水多孔硅制备及其对水中有机污染物的吸附.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、物理化学学报(WuliHuaxueXuebao)1432ActaP.一Chim.Sin.2012,28(6),1432-1438June【Article]doi:10_3866/PKU.WHXB20l203151Vi,、^^,.whxb.pku.edu.CR疏水多孔硅制备及其对水中有机污染物的吸附孙涛郭悦李文翠陆安慧(精细化s-N家重点实验室,大连理工大学化工与环境生命学部化工学院,辽宁大连l16024)摘要:以硅酸钠为硅源,盐酸为催化剂,三甲基氯硅烷(TMCS)为表面改性剂,经溶胶.凝胶和表面改性过程制备出一种疏水性多孔硅材料.采用傅里叶变
2、换~I#b(FTIR)光谱仪、接触角分析仪、氮气物理吸附仪和扫描电子显微镜(SEM)对其结构和性质进行表征.结果表明:所制备的多孔硅具有分等级孔道结构(中孔.大孔),比表面积为566m-g~,孔体积高达2.28cm。·g~,多孔硅与水的接触角为156。,显示出超疏水特征.对甲苯、汽油、柴油和润滑油的吸附量均可高达自身质量的14倍,丰富的孔道使其在几分钟内即可达到饱和吸附.这种多孔硅在汽油/水混合体系中对汽油具有较高的选择性,同时具有良好的再生能力.经正己烷萃取再生后,多孔硅仍能基本保持初始吸附容量.此方法制备的多孔硅材料在吸附分离污水中的有机
3、物和溢油处理方面具有很好的应用前景.关键词:多孔硅:疏水性:吸附:有机污染物:再生中图分类号:0647SynthesisofHydrophobicPorousSilicaforRemovalofOrganicContaminationsfromWaterSUNTaoGUOYueLlWen—CuiLUAn.Hui(StateKeyLaboratoryofFineChemicals,SchoolofChemicalEngineering,FacultyofChemical,EnvironmentalandBiologicalScienceandT
4、echnology,DalianUniversityofTechnology,Dalian116024,LiaoningProvince,PR.China1Abstract:Ahydrophobicporoussilicamateria1wassuccessfullysynthesizedusingsodiumsilicateassilicasource,hydrochloricacidascatalyst,andtrimethylchlorosilane(TMCS)asasurfacemodifyingagent,throughsol—ge
5、landSUrfacemodificationprocesses.ThestructureandpropertiesofthefabricatedporoussilicawereanalyzedbyFourier-transforminfrared(FTIR)spectroscopy,contact.angleanalyzer,liquidN2adsorption,andscanningelectronmicroscopyfSEM).TheporoussilicadisplayedahierarchicaIporousstructureand
6、wassuper—hydrophobic.withcontactangleashighas156。.SpecificSUrfaceareaandporevolumeweredeterminedtobe566m·g~and2_28cm。·g~,respectively.Moreover.theporoussilicacouldadsorbuptO14timesitsownmassoftoluene,gasoline,diesel,andIubeoil.Theabundantmesoporesandmacroporesallowedadsorpt
7、ionsaturationtobereachedwithinseveralminutes.Inaddition.theporoussilicawasextremelyhydrophobicingasoline—watermixtureandthuspreferentiallyadsorbedorganiccompoundsotherthanwater.ThisiSanimpo~antrequisiteofgoodrecyclability.Itwasverifiedthat.followingextractionwithn-hexane,th
8、eregeneratedporoussilicaretaineditsinitiaIadsorptioncapacity.Thisporoussilica,with
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