Photocatalytic Property Of Er-TiO₂Nanotube And Mesoporous Er-TiO₂under Visible Light

As one of the best promising photocatalysts，TiO₂has been widely investigateddue to its nontoxicity, biological and chemical stability, inexpensiveness and favorableoptoelectronic properties. However, there are still some technical problems such aslittle utilization of solar energy，much exhausted energy of UV light and moredangeries for human being and environment, which limits the further application oftitanium dioxide, so improving the absorption properties of titanium dioxide is ofgreat significance. In this study, as a matrix, TiO₂could degrade organic compoundsunder visible light not only by doping Er³⁺but also by using its upconversionluminescence properties. Specific works are as follows:1. Er³⁺-doped titania nanotubes and mesoporous were prepared by hydrothermalmethod respectively.2. The structure properties of samples were characterized by XRD, UV-Vis, BET,SEM and TEM, and the results were discussed in detail.3. The photocatalytic effect of Er-TiO₂nanotubes on phenol was investigated.The influences of different hydrothermal temperature, different hydrothermal times,the amount of catalyst in the reaction, different pH of the solution and differentcalcination temperature were discussed. The upconversion mechanism and energyabsorption、transfer on the surface of Er-TiO₂in the photocatalytic degradationprocess were explored.4. The photocatalytic antibacterial effect against Escherichia coli （JM-109） andphotocatalytic degradation activity on phenol of mesoporous Er³⁺-doped TiO₂undervisible light were researched. The influences of different calcination temperature,different hydrothermal time, different hydrothermal temperature and the amount ofCTAB in the synthesized process were discussed. The probable upconversion and theenergy absorption and transfer mechanism of photocatalytic process were proposed.