孔壁包埋磁性纳米颗粒型介孔材料的制备及固相萃取研究

项目名称： 孔壁包埋磁性纳米颗粒型介孔材料的制备及固相萃取研究

项目编号： No.21207059

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 环境化学

项目作者： 张升晓

作者单位： 鲁东大学

项目金额： 25万元

中文摘要： 本项目提出将磁性纳米颗粒包埋于介孔硅和介孔碳的孔壁，制备有序磁性介孔材料，以其为吸附剂建立新型磁性固相萃取方法。分别以正硅酸乙酯和酚醛树脂作为硅源和碳源，聚氧烯烃嵌段聚合物为模板剂，将超细磁性纳米颗粒自组装到液晶模板的亲水段，陈化使溶胶交联聚合为干凝胶，焙烧除去模板，得到的材料磁性纳米颗粒包埋于介孔孔壁，既赋予材料超顺磁性，又不会破坏其有序介孔结构。这种新型结构有利于保持介孔材料强的吸附性能、快速吸附/脱附的动力学特点，同时包埋于孔壁的磁性纳米颗粒能够得到有效地保护，防止其由于脱落、氧化、酸消解等而失去磁性能。选用典型的环境污染物为目标物，研究其在磁性介孔材料上的吸附/脱附性能，考察萃取条件对回收率的影响，建立新型固相萃取方法，并用于从具有复杂基体的环境样品中萃取分析目标物。项目将纳米、自组装、磁分离和固相萃取技术结合为一体，是一项具有重要学术价值和应用前景的原创性研究。

中文关键词： 磁性；介孔硅；介孔碳；吸附；环境污染物

英文摘要： In this project, we aim to encapsulate magnetic nanoparticles (MNPs) into the pore wall of mesoporous silica and mesoporous carbon to get ordered mesoporous materials, and attempt to develop a novel solid-phase extraction (SPE) method based on the prepared materials. To prepare magnetic mesoporous materials, phenolic resin and tetraethylorthosilicate (TEOS) are used as carbon and silica source, respectively, and PEO-PPO-PEO triblock copolymers as template agent. In mixture solution, triblock copolymers form liquid crystal template, and ultrafine MNPs and carbon or silica sols will self-assemble into hydrophilic chains, then sols are aged into dried gels. The dried gels are calcined to remove template to get ordered mesoporous meterials with MNPs embedded in pore wall. The incorporation of MNPs into pore wall of mesoporous materials will not only endow the materials superparamagnetism, but also maintain their ordered mesoporous structure. This novel structure keeps the strong adsorptive capacity and rapid adsorption/desorption character of mesoporous material. Moreover, MNPs can be protected by the silica shell from lossing magnetic property due to fall off, oxidation, or acid digestion. Several typical pollutants are selected as target compounds to investgate their adsorption/desorption behaviour on prepared mag

英文关键词： Magnetic；Mesoporous silica；Mesoporous carbon；Adsorption；Environmental pollutants