磁性SiO2载体的表面改性与纳米TiO2光催化剂的固载

以Fe3O4米粒子为磁响应成分,制备了SiO2/Fe3O4磁性载体,采用回流热处理的方式对载体进行了表而改性.利用傅里叶变换红外和X-射线光电子能谱等手段对改性前后的载体进行分析.结果表明,载体改性后表面的Si-O-Si键数量明显减少,Si-OH的数量有所增加.以TiO2为探针催化剂,Procion染料为探针分子考察了载体的表面改性对催化剂固载量和光降解催化活性的影响,结果表明,改性后的载体明显提高了TiO2催化剂的固载量和降解Procion的催化活性.

Surface Modification of a Magnetic SiO2 Support and Immobilization of a Nano-TiO2Photocatalyst on It

This study presented an effective method to modify the surface chemical reactivity of a SiO2/Fe3O4 support. The unmodified SiO2/Fe3O4support was prepared by the hydrolysis and condensation of tetraethoxysilane on the surface of hydrophilic Fe3O4 nanoparticles. These were then modified by a heat treatment in an ethanol/water solution under reflux. The resulting samples were characterized by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and transmission/scanning electron microscopy. The immobilization of a TiO2nanocatalyst on both unmodified and modified supports was performed to investigate the effects of the modifica-tion of the magnetic silica support on the loading of a TiO2nanocatalyst and the photocatalytic activity. The loading of TiO2and the photo-catalytic activity were both improved.