纳米TiO_2薄膜在不同基质表面的负载及光催化性能

Load and its photocatalytic properties of nanocrystalline TiO_2 thin film con two kinds of different substrate surface

以釉面陶瓷和普通钠钙玻璃为载体,用溶胶凝胶法在其表面进行了纳米TiO2薄膜的负载.采用X射线衍射法(XRD)、扫描电子显微镜(SEM)和X射线光电子能谱仪(XPS)对薄膜进行了表征与分析.结果表明,TiO2为完全的锐钛矿型,平均粒径约为15nm;TiO2薄膜在2种载体上分布均匀,膜厚约为300nm;TiO2薄膜在釉面陶瓷表面呈连续分布,而在玻璃表面上出现了破裂现象;2种载体中的一些基质离子在TiO2薄膜均有渗透.光降解实验表明,2种载体上的TiO2薄膜对亚甲基蓝的降解均符合一级反应动力学.TiO2/釉面陶瓷催化活性大于TiO2/玻璃,该薄膜对实际生产多菌灵废水具有催化降解作用.2种载体上的TiO2薄膜重复使用20次,对亚甲基蓝的去除率降低约2%.

TiO2 nano-crystalline thin films on glazed ceramic and common soda-time glass were prepared by sol-gel method. The films were characterized and analysed by X-ray diffraction （XRD）, scanning electron micrographas （SEM） and X-ray photoelectron spectroscopy （XPS）. All specimens exhibited nano-sized crystyals of the anatase phase and the crystal size was about 15nm; the TiO2 film was distributed evenly on these two kinds of carriers with thickness about 300nm, and the film distributed continuously on the surface of the glazed ceramic; but on the glass surface, the films appeared cracked phenomenon; some substrate ions in these two kinds of carriers permeated into the TiO2 thin films. Photo degradation experiment showed that the degradation of methylene blue by these TiO2 films on two kinds of carriers accorded with the first order reaction kinetics; the catalytic activity followed： TiO2/glazed ceramic 〉TiO2/glass; and the TiO2 thin films possessed the activity of catalytic degradation of Badistan wastewater produced actually; when the degradation experiment was repeated 20 times, the removal rate of methylene blue by two kinds carders of TiO2 film was reduced about 2%.