2007 NSTI Nanotechnology Conference and Trade Show - Nanotech 2007 - 10th Annual

Preparation and application of visible-light responsive TiO2 photocatalyst for organic pollutant degradation

S. Lee, J. Lee, I. Choi, S. Hong, Y.I. Yang, Y. Kim and J. Yi
Institute of Chemical Processes, Seoul National University, KR

Keywords:
photocatalyst, pollutant degradation, titanium dioxide (TiO2)

Abstract:
Titanium dioxide (TiO2) has been known to be a promising material as a practical photocatalyst in various fields, such as removal of organic pollutants and solar cells. Especially, with a growing interest in environmental issues, the removal of organic pollutants using a TiO2 photocatalyst has been widely studied [1,2]. However, the pure TiO2 has a large band gap energy that is too broad to function under the visible range light and the material only absorbs ultraviolet light, and thus is limited to its practical and useful use. In this study, C/N-codoped TiO2 powders were prepared by a modified sol-gel process in order to use under visible light, and characterized. The photocatalytic activity of resulting materials was compared with that of commercial TiO2 (Degussa P-25). Results showed that the C/N-codoped TiO2 powders prepared are pure anatase structure, and have small crystallite size with mesopore structure. They have a large surface area which is advantageous for the enhancement of photocatalytic activity. Interestingly, the C/N modified TiO2 photocatalysts absorbed a wider range of visible light than the commercial photocatalysts, which indicates that they have high photocatalytic activity under visible light, as also proved by methylene blue decomposition

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