Study on the Fabrication of Visible Light Response Type N-Doped TiO₂ Photocatalyst by SPS

Abstract:

It is recognized that TiO₂, the most popularly used photocatalyst, has a disadvantage that it only react with ultraviolet light. In this study, nitrogen-doped TiO₂ 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 TiO₂ powders were synthesized from a mixed aqueous solution containing TiCl₃ and NH₃. 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 TiO₂ powder and non-doped TiO₂ powder were sintered by SPS at 400 or 700°C. N-doped TiO₂ 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 TiO₂ 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.

• Periodical: Advances in Science and Technology (Volume 77)
• Pages: 59-64
• DOI: https://doi.org/10.4028/www.scientific.net/AST.77.59
• Online since: September 2012
• Authors: N. Kikuchi, T. Asaoka

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