电气石/TiO_2复合薄膜的显微结构及光催化活性研究

MICROSTRUCTURE AND PHOTOCATALYTIC ACTIVITIES OF TiO_2 COMPOSITE FILMSCONTAINING FINE TOURMALINE POWDERS

在钛溶胶制备过程中加入天然电气石微粉,制得含电气石的钛溶胶,然后在紫铜表面镀膜形成含电气石的TiO2复合薄膜。用SEM研究电气石/TiO2复合薄膜的显微结构特征;用光催化降解甲基橙实验研究电气石微粉对TiO2薄膜光催化活性的影响。结果表明:电气石微粉能均匀的分布在紫铜表面的TiO2薄膜中,且形成了以电气石为核心的TiO2微粒簇,其中TiO2微粒具有阶梯层状结构和表面纳米凸起。用紫外线照射3h后,与不含电气石的TiO2薄膜相比,含质量分数为0 54%电气石的TiO2单层和双层复合薄膜对甲基橙的光催化降解率可分别提高12 1%和28 6%。

The novel TiO2 composite films containing 0.54 %(in mass fraction ) fine tourmaline powders were prepared by the process of coating on the copper surface with composite TiO2 sol, in which fine tourmaline powders were added during preparation. The microstructures and photocatalytic activities of the films were investigated by scanning electron microscope (SEM), and the effects of fine tourmaline powders on photocatalytic activities of TiO2 films were determined by the methods of photocatalytic degradation of methyl orange. The results show that the clusters of TiO2 particles with lots of nano-sized TiO2particles on the surface and ladder layer structures, are grown on the surface of fine tourmaline powders; The average diameter of the clusters and the TiO2 particles are 14 μm and 2 μm, respectively; The thickness of ladder layer is 10 nm, and the average diameter of nano-sized TiO2particles is 15 nm; The methyl orange degradation ratio of the novel TiO2 composite films coated once and twice increased respectively by 12.1% and 28.6% than that of the TiO2 thin films prepared by the same method except for the TiO2 sol which there is no fine tourmaline powders , under the irradiation of ultraviolet for three hours.