磁性纳米光催化剂的制备及其光催化性能

以Fe3O4为载体，制备了易于固液分离回收的磁性复合纳米光催化剂，采用SEM，元素分析，XRD等方法表征催化剂的表面形貌，晶体结构，结果表明，二氧化钛包裹在Fe3O4的表面，其包裹量越大，粒径越大，锐钛矿峰越强，利用光催化降解甲基橙的效果来考察磁性复合光催化剂的活性，直接包裹在Fe2O4表面的TiO2活性低于纯TiO2的，而在Fe3O4与TiO2之间包裹SiO2，可以有效地提高其光催化活性，其活性与纯TiO2接近。

Preparation of nanometer-sized magnetic photo-catalysts and their photo-catalytic activity and properties

Innovative nanometer sized magnetic photo catalysts, which are named as TiO 2/NiPc/Fe 3O 4 or TiO 2/SiO 2/NiPc/Fe 3O 4 and are liable to be separated and recovered, were prepared using Fe 3O 4 as support. The surface morphology and crystal pattern were investigated by means of SEM, element analysis and XRD. The results showed that TiO 2 wraps on the surface of Fe 3O 4, and that the particle size and the intensity of anatase (101) peaks increased with the increase of TiO 2 content. As a probe reaction, the photo catalytic activity is evaluated by methyl orange photo oxidation. When TiO 2 directly wraps on the surface of Fe 3O 4, the photo catalytic activity is lower than that of pure TiO 2. However, when SiO 2 wraps on the surface of Fe 3O 4 at first, and then TiO 2 wraps on the surface of SiO 2, the photo catalytic activity of TiO 2/SiO 2/NiPc/Fe 3O 4 is near to that of pure TiO 2.