Synthesis and Photocatalytic Properties of Three-Dimensional Mesoporous Titanium Dioxide.

The three-dimensional (3D) mesoporous titanium dioxide (TiO2) was synthesized by microwave-assisted hydrothermal method, using titanium sulfate as titanium source and urea to adjust pH value. Its structure and photocatalytic oxidation properties were studied. The results show that the TiO2 particles have a 3D mesoporous structure, uniform distribution and spherical shape, the average diameter is about 0.67 μ m. These properties provide strong light adsorption, high specific surface area, which increases the active site of the photocatalyst, porosity can also enhance the ability of the material to adsorb pollutants, thus has better stability. It was applied to photocatalytic degradation of 10 mg/L rhodamine B (RhB) solution. After 80 min of irradiation under 420 nm ultraviolet (UV) light, the degradation rate of RhB reached more than 90%. In addition, it also provided an excellent photocatalytic efficiency of removing Hg0 in simulated flue gas. The removal efficiency could still reach over 86% after 40 h, which could be used in the treatment of heavy metal pollutants such as metallurgical flue gas. A spherical three-dimensional mesoporous titanium dioxide (TiO2) with an average diameter of about 0.67 μm was prepared by microwave-assisted hydrothermal method. Compared with the other three TiO2 materials, the TiO2 prepared by microwave-assisted hydrothermal method (CT) has stronger light absorption capacity and larger specific surface area, which can remove Hg0 in simulated flue gas more effectively and stably. [ABSTRACT FROM AUTHOR]