Research on Photocatalytic Properties of TiO_2 Nanotube Arrays

摘要

In order to solve the problem of low time catalytic efficiency of photocatalytic hydrogen production in the field of photocatalysis, this paper proposes to improve the photocatalytic efficiency from the aspects of preparation technology of catalysts and modification by doping of other elements. First, titanium dioxide nanotube arrays were prepared by anodic oxidation. Then, by changing the process parameters, such as oxidation voltage, titanium wire diameter, water content in electrolyte and oxidation time, different morphology of titanium dioxide nanotubes were obtained. At the same time, the catalyst was doped with Fe by soaking the catalyst in iron nitrate solution, and the modification of Tio2 nanotubes was achieved, and their photocatalytic efficiency was studied. The results showed that the photocatalytic performance of the catalyst was better under the following conditions: the ratio of water to ethanol was 8:1, the diameter of the titanium filament was larger, the oxidation time was 4h, the oxidation voltage was 60V, and the iron doping concentration was 0.02mol/L. In conclusion, the above items have a significant impact on the photocatalytic efficiency. Especially, the Fe-doped catalyst showed better catalytic activity, and its hydrogen production efficiency was greatly improved when irradiated with ultraviolet light than that of the undoped catalyst.