巯基功能化介孔氧化硅的合成及其对Pb(Ⅱ)的吸附  

Synthesis of thiol-groups functionalized mesoporpous silica and its Adsorption of Pb(Ⅱ)

作　　者：李健生[1] 苗小郁[1] 易睿[1] 郝艳霞[1] 孙秀云[1] 刘晓东[1] 王连军[1] 

机构地区：[1]南京理工大学环境科学与工程系,江苏南京210094

出　　处：《功能材料》2007年第8期1386-1388,共3页Journal of Functional Materials

基　　金：高等学校博士学科点专项科研基金资助项目(20060288008);江苏省自然科学基金资助项目(BK2006205);南京理工大学青年学者基金资助项目(njust200502)

摘　　要：采用直接模板法,以三嵌段共聚物P123作为模板剂,酸性条件下制备出了具有规则孔道结构的介孔氧化硅。用有机硅烷MPTMS对其进行后续功能化,引入了对Pb2+离子有吸附能力的巯基基团。通过HRTEM、FTIR和N2吸附脱附等测试手段对功能化前后氧化硅的结构进行表征,结果表明,巯基功能团接枝在介孔氧化硅孔道内壁。吸附实验结果显示,巯基功能化氧化硅对水中Pb(Ⅱ)离子具有选择吸附性。当铅与铜、镉离子摩尔比为1∶5时,巯基功能化材料对其吸附的分配系数之比分别为KdPb2+/KdCu2+=13.1和KdPb2+/KdCd2+=9.2。在Cu2+、Cd2+离子摩尔浓度相同时,此功能化介孔材料对Cd2+的吸附能力大于对Cu2+的吸附能力。　Mesoporous silica with well-ordered pore structure was prepared using triblock copolymer P123 as template under acidic condition via a direct-templating synthesis.As-synthesized silica was functionalized with （3-Mercaptopropyl） trimethoxysilane（MPTMS） to graft the group of thiol-groups,which had adsorption ability of Pb（Ⅱ） ions in aqueous solution.The structure of mesoporous silica before and after functionalization was investigated by high-resolution transmission electron microscopy（HRTEM）,fourier transform infrared spectroscopy（FTIR） and nitrogen-adsorption/desorption measurements.The results show that the thiol-functional groups have been grafted to the inner wall of mesoporous silica.Adsorption experiments indicate that functionalized materials have selective adsorption ability for Pb2＋ ions in aqueous solution.Thiol-functionalized mesoporous silica had efficient competitive adsorption ability for Pb^2＋ ions from an mixed-metal solution containing x（Pb^2＋）∶x（Cu^2＋） or x（Cd^2＋）=1∶5（the molar ratio）.The ratio of distribution coefficient were KdPb^2＋/KdCu^2＋=13.1 and KdPb^2＋/KdCd^2＋=9.2,respectively.Thus reveals the obtained functionalized materials possess better adsorption ability for Cd^2＋ ions than Cu^2＋ ions in the aqueous solution with same molar concentration.

关 键 词：介孔氧化硅 功能化 吸附 重金属 

分 类 号：O647.31[理学—物理化学]