Study on the fabrication of visible light response type N-doped TiO_2 photocatalyst by SPS

摘要

It is recognized that TiO_2, the most popularly used photocatalyst, has a disadvantage that it only react with ultraviolet light. In this study, nitrogen-doped TiO_2 was selected as strategy for promoting the absorption of visible light, and SPS (spark plasma sintering) method was tried to fabricate a dense specimen without using binder materials. Preparation methods of specimen are as follows; yellow-colored N-doped TiO_2 powders were synthesized from a mixed aqueous solution containing TiCl_3 and NH_3. The precipitate was air-dried for 1 week. Then dried in a drying oven for 1day(50°C). And heat-treated for 1h(400°C).N-doped TiO_2 powder and non-doped TiO_2 powder were sintered by SPS at 400 or 700°C. N-doped TiO_2 fabricated by SPS showed a favorable crystal structure of anatase, and successful existence of doped nitrogen was confirmed by XPS analysis. UV-vis results showed that N-doped TiO_2 responded to visible light, which indicates an increasing possibility of this type of photocatalyst. Further study to extend the range of absorption wavelength is carrying out.