以甲酸溶液为介质的磁性介孔硅纳米材料的制备及其吸附性能

摘要

以甲酸溶液为介质,采用溶剂热法、改良的Stober法,用聚乙烯-聚乳酸共聚物做模板剂制备磁性介孔硅纳米材料,通过X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)、综合物性测量系统(PPMS)、比表面积及孔径分布测量仪等分析测试手段对所得磁性介孔硅纳米材料进行表征,并研究了其吸附性能.结果显示,以0.2 mol/L甲酸溶液为介质制备的磁性介孔材料孔径为8.2 nm、比表面积为258m2/g、孔体积为0.32 cm3/g,饱和磁化强度达53 A·m2/kg.这种磁性介孔硅纳米材料对牛血清蛋白、中性红、亚甲基蓝等物质有良好的吸附能力,其饱和吸附量分别达到53.6、24.1、66.8 mg/g,表明制备的磁性介孔硅纳米材料在复杂环境样品的分离和富集方面具有一定的应用前景.%A new magnetic mesoporous silica nano material was synthesized by using improved Stober and solvothermal methods with formic acid solution as acidic medium and PEG-PLA as template.X-ray diffraction (XRD),field emission scanning electron microscopy (FE-SEM),transmission electron microscopy (TEM),physical property measurement system (PPMS),and specific surface area and pore size distribution measuring instrument were applied to characterize this material.The results showed that the magnetic mesoporous silica nano material which was synthesized in 0.2 mol/L formic acid solution had 8.2 nm of pore cavities,258 m2/g of surface area,0.32 cm3/g of pore volume and 53 A · m2/kg of saturation magnetization.This magnetic mesoporous silica nano material had favorable adsorption capacity of bovine serumalbumin,toluylene red and methylene blue with 53.6,24.1,66.8 mg/g respectively,which indicated it had certain application prospect in the separation and enrichment complex aspects of environmental samples.