可见光下上转换发光材料掺杂纳米TiO_2的光催化活性研究

A Study on Visible Light Photocatalytic Activity of Nano TiO_2 Doped with Upconversion Luminescence Agent

印染工业的发展加剧了环境污染,传统的处理染料废水的方法存在许多难以克服的缺点。从保护环境和节省能源的角度出发,人们对TiO2应用在染料污水降解领域的研究给予了较大的关注。本文制备出上转换发光材料掺杂的纳米TiO2光催化剂。用XRD和TEM对这种催化剂进行了表征,通过在可见光下降解亚甲基兰溶液对样品的光催化活性进行了评价,研究了掺杂浓度,样品投放量以及光照时间对催化剂的光催化活性的影响。结果表明掺杂样品在可见光下能有效地分解有机物,而未掺杂样品则产生了大量有毒中间产物,因此上转换发光材料掺杂的TiO2光催化剂在可见光下具有较好的光催化活性。

Dyestuffs from the textile industries are becoming a major source ofenvironmental contaminations. The treatment of dye-containing wastewater by conventional methods has drawback due to difficulties in the complete removal of color and expensive. From the viewpoint of protecting environment and saving energy, people have a good attention to the researches about using TiO2 degradation the dyestuffs waste water. In this paper, the TiO2 photocatalysts doped with upconversion luminescence agent （ Er^3＋·NaYF4 ） was prepared and characterized by X-ray diffraction and transmission electron microscope absorption spectra. The photocatalytic activity of the doped TiO2 photocatalysts under visible light was studied by degradation of methylene blue solution. The influences of dopant concentration, addition amount of doped TiO2 catalyst and irradiation time on the degradation process were also investigated. The results showed the doped sample could degrade the methylene blue thoroughly, but the un-doped sample generated intermediate products contain benzene ring in degradation. So the TiO2 photoeatalysts doped with the prepared upconversion luminescence agent had a good photocatalysts activity under the visible light.