Preparation Of Meso-porous And C,N Doped Nano-TiO₂ Catalysts And Photocatalytic Applcation

High activity TiO₂ catalysts were prepared by a sol-gel method in this paper. Catalysts were characterized using various techniques. The photocatalytic activities of TiO₂ were evaluated by the photocatalytic reaction.1. TiOrC nanoparticles were prepared by a sol-gel method with using PF (phenol formaldehyde) and UF (urea- formaldehyde) as templates. They were characterized using XRD,SEM ,XRF and UV-VIS. The particles were in anatase form, about 10 nm in size. The photocatalytic activities of TiO₂-C were evaluated by the photocatalytic oxidation of phenol in water(100ppm) under ultraviolet and solar light, and the best phenol removal is 55% and 27% respectively.2. TiO₂ nanoparticles in anatase form were prepared by a sol-gel method with adding triethylamine and Triethanolamine. The particles size were about 10 nm. A doping nitrogen step was introducing by adding triethylamine. It is that nitrogen doping contributes to high visible light activity. The best phenol(100ppm) removal is 66% and 38% under ultraviolet and solar light respectively.3. TiO₂-xNx nanoparticles were prepared by a sol-gel method with using ACF as template, and were characterized using various techniques such as XRD,SEM and TEM, XPS and UV-VIS. The ratio of Ti to N in N doped TiO₂ can reach l:0.19.The absorbency wavelength in Uv-Vis spectra extended to 700⁸00nm. The photocatalytic activities of TiO₂-xNx were evaluated by the photocatalytic oxidation of ammonia in water using ultraviolet or solar light as light source. The best ammonia removal(2h) under solar light and UV photocatalysis reached 47% and 68% respectively.4. TiO₂-xNx films were prepared by a sol-gel method. They were characterized using XRD,SEM ,XRF and UV-VIS. The photocatalytic activities of TiO₂ films were evaluated by the photocatalytic oxidation of ammonia in water(56ppm) under ultraviolet and sodium lamp light, and the best ammonia removal is 26.2% and 55.8% respectively.