稀土镧掺杂的TiO2微球制备及其光催化性能研究

以四氯化钛为原料,采用溶胶-凝胶法制备了掺杂镧的TiO2 微球. 采用X-射线衍射、荧光光谱、扫描电镜等手段对样品进行表征,结果表明:所制得的掺杂镧的TiO2 微球直径在300~600 μm之间,微球中TiO2 晶粒为锐钛矿相和金红石相的混合晶型,且以锐钛矿为主相,平均粒径为20 nm左右. 分别在太阳光和300 W高压汞灯的光照下,考察了不同光催化剂对甲基橙染料的光催化效果,结果表明,掺杂La2 O3 的TiO2 复合微球具有较好的光催化性能.

Preparation and Photocatalytic Activity of TiO2 Microspheres with Lanthanum Doping

The TiO2 microspheres with lanthanum doping are prepared by sol-gel method with TiCl4 as reaction material. The synthetic samples are charicterized by X-ray diffraction, fluorescence spectrum and scanning electron microscopy. Results show that the prepared TiO2 is the mixture of anatase crystal and rutile crystal, and the main form is anatase crystal. The diameter of TiO2 microspheres with lanthanum doping is between 300~600μm, the average diameter of TiO2 crystalline grain is about 20 nm. Irradiations are performed with 300W high-pressure mercury lamp and sunlight, respectively. The photocatalytic effect on methyl orange is invesigated by different photocatalysts. The results show that the composite TiO2 microspheres have better photocatalytic activity.