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Light-driven Enzymatic Decarboxylation
Published on: May 22, 2016
Visible-light photocatalysis in nitrogen-doped titanium oxides
R Asahi1, T Morikawa, T Ohwaki
1Toyota Central R&D Laboratories, Nagakute, Aichi 480-1192, Japan. rasahi@mosk.tytlabs.co.jp
Science (New York, N.Y.)
|July 14, 2001
Summary
Nitrogen-doped titanium dioxide (TiO2-xNx) shows enhanced photocatalytic activity under visible light, improving solar energy utilization. This advanced material efficiently degrades pollutants and enhances surface hydrophilicity.
Area of Science:
- Materials Science
- Photocatalysis
- Surface Chemistry
Background:
- Efficient photocatalysts are crucial for visible light applications like solar energy conversion.
- Titanium dioxide (TiO2) has limitations in visible light absorption and activity.
- Developing modified TiO2 with improved properties is an active research area.
Purpose of the Study:
- To develop a highly reactive photocatalyst for efficient use of solar irradiation and interior lighting.
- To investigate the performance of nitrogen-doped titanium dioxide (TiO2-xNx) under visible light.
- To understand the role of nitrogen doping in enhancing photocatalytic properties.
Main Methods:
- Synthesis of TiO2-xNx films and powders.
- Optical absorption measurements.
- Photocatalytic activity tests (methylene blue degradation, acetaldehyde photodegradation).
- Surface hydrophilicity assessment.
- First-principles calculations and X-ray photoemission spectroscopy (XPS) for material characterization.
Main Results:
- TiO2-xNx exhibited superior optical absorption and photocatalytic activity compared to TiO2 under visible light (< 500 nm).
- Significant improvements were observed in the photodegradation of methylene blue and gaseous acetaldehyde.
- Enhanced hydrophilicity of the TiO2-xNx film surface was noted.
- Nitrogen doping at substitutional sites was confirmed to narrow the band gap and boost photocatalytic performance.
Conclusions:
- Nitrogen doping is essential for enhancing the visible light photocatalytic activity of TiO2.
- TiO2-xNx presents a promising material for applications requiring efficient visible light photocatalysis.
- The findings provide insights into the mechanism of band gap narrowing and improved performance in doped TiO2.
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