磁载纳米TiO_2光催化剂的制备及其光催化性能研究

Study on Preparation and Photocatalytic Activity of Titania-Coated Magnetite Photocatalysts

采用肼((NH2)2·H2O)还原硝酸铁(Fe(NO3)3)法制备纳米级磁基体(Fe3O4),以聚乙二醇对其表面进行改性,通过溶胶-凝胶法制得TiO2/Fe3O4磁载纳米TiO2光催化剂,并用于光催化降解橙黄-II,对其活性进行评价.结果表明:TiO2/Fe3O4光催化剂的降解率在第一次使用时与纯TiO2相近,三次循环使用后,仍能保持较高的催化活性.催化剂的最佳用量为4g/L,在酸性和碱性环境中均能保持很好的催化活性.

Nano\|magnetite matrix Fe\-3O\-4 was prepared by hydrous reduction of ferric nitrate in the presence of polyethylene glycol (PEG). TiO\-2/ Fe\-3O\-4 has been successfully prepared by sol\|gel method. The photocatalytic activity of this catalyst was tested with Orange\|II as decomposition substance. The results show that TiO\-2/ Fe\-3O\-4 have a good photocatalytic activity after being used three times and its effect is similar to that of pure TiO\-2 in the first using. An optimized concentration of the catalyst in solution was found at 4 g/L and the degradation of Orange\|II solution is concerned in the range of pH=2~12.