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赋磁硅气凝胶的制备、表征和吸附异狄氏剂特性

Keywords: 赋磁硅气凝胶,四氧化三铁,表面修饰,异狄氏剂

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Abstract:

以工业水玻璃为硅源,采用六甲基二硅胺烷(HMDZ)作为改性剂,掺杂纳米级Fe3O4,通过溶胶-凝胶、常压干燥技术,制备得到赋磁硅气凝胶吸附材料(MSA)。采用红外光谱(FTIR)、扫描电镜(SEM)、比表面分析(BET)及振动样品磁强计(VSM)等方法对其结构进行了表征,并对其吸附性能进行研究。结果表明,制得的赋磁硅气凝胶接触角在113°~116°之间,比表面积可达589.79m2/g,密度约为0.192g/cm3,饱和磁化强度约为0.44emu/g,具有超顺磁性。赋磁硅气凝胶对疏水性有机物异狄氏剂表现出良好的吸附性能,符合Freundlich等温吸附模型,KF为42.91;吸附动力学符合准二级动力学模型,吸附速率常数为0.0341g/(mg·min)。

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