钛酸纳米管的光催化性能研究

Study on the photo-catalytic characteristics of titanate nanotubes

以TiO_2(Degussa P25)和NaOH为原料,采用水热法制备钛酸纳米管。以亚甲基蓝溶液(Methylene Blue,简称MB)为模型污染物,研究水热反应条件对所制钛酸纳米管光催化性能的影响,以及钛酸纳米管加入量、溶液pH值和MB初始浓度等光催化反应条件对钛酸纳米管光催化性能的影响。研究表明:水热反应温度为150℃,反应时间为48 h制得的钛酸纳米管对MB的光催化效率最高;钛酸纳米管的加入量、溶液pH值和MB初始浓度等光催化反应条件对钛酸纳米管的光催化性能有较大影响。

This paper intends to present our method in preparing titanate nanotubes by using a hydrothermal TiO2 （Degussa P25 ） and NaOH as raw materials. The paper has also investigated the effects of hydrothermal reaction conditions, including hydrothermal reaction time and hydrothermal reaction temperature on the photo-catalytic characteristic features of the nanotubes by means of Methylene Blue （MB） aqueous solution as a simulated pollutant while discussing the effects of the content added to the titanate nanotubes, the pH value of the solution and the initial concentration of MB on the photo-catalytic features of the nanotubes. The results of our investigation and analysis show that with the increase of the reaction time, the photo-catalytic efficiency of the nanotubes also increases. When the reaction temperature remains in a certain range, the photo-catalytic efficiency of the nanotubes tends to increase with the rising of the reaction temperature. The photo-catalytic efficiency of the nanotubes would reach its maximum at the temperature of 150 ℃ during the hydrothennal reaction time of 48 h. In addition, the photo-catalytic efficiency of titanate nanotubes proves to be related with the adsorption amount. When the adsorption is getting higher, the photo-catalytic efficiency of the titanate nanotubes tends to get improved. On the other hand, the increase of the content of titanate nanotubes, the rise of the pH value of the solution and the initial concentration of MB also prove to have great effect on the photo-catalytic activities of the nanotubes. Therefore, to some extent a degree, it can be said that the higher the added content, the better the photo-catalytic features would be. When the solution was alkaline and the concentration of MB was low, the photo-catalytic characteristics could be expected better.