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Published on: July 4, 2017
Preparation and characterization of nitrogen-doped titanium dioxide
Bao-Chrung Hsu1, Shiao-Shing Chen, Chaochin Su
1Institute of Environmental Engineering and Management, National Taipei University of Technology, Taipei 106, Taiwan.
Journal of Nanoscience and Nanotechnology
|November 21, 2007
Summary
Nitrogen-doped titanium dioxide (TiOxNy) nanocrystals were synthesized for enhanced visible-light absorption. These doped materials show promising photocatalytic activity for degrading methylene blue under visible light.
Area of Science:
- Materials Science
- Nanotechnology
- Photocatalysis
Background:
- Titanium dioxide (TiO2) has limited absorption in the visible-light spectrum, hindering its application in visible-light photocatalysis.
- Developing visible-light-responsive photocatalysts is crucial for efficient solar energy utilization and environmental remediation.
Purpose of the Study:
- To synthesize nitrogen-doped titanium dioxide (TiOxNy) nanocrystals.
- To investigate the effect of nitrogen incorporation on the optical and photocatalytic properties of TiO2.
- To explore the correlation between photocatalytic activity and material characteristics.
Main Methods:
- Preparation of TiOxNy nanocrystals via calcination of Degussa P-25 TiO2 and NH4Cl under airtight conditions (350-500°C).
- Characterization using X-ray photoelectron spectroscopy (XPS) to confirm nitrogen incorporation.
- Evaluation of photocatalytic activity through methylene blue decomposition under visible light irradiation.
Main Results:
- Nitrogen incorporation into the TiO2 lattice was confirmed by XPS, leading to a red-shift in the absorption edge.
- The synthesized TiOxNy samples exhibited significant photocatalytic activity under visible light.
- Photocatalytic performance was correlated with nitrogen content, rutile phase, and surface area.
Conclusions:
- Simple synthesis of nitrogen-doped TiO2 (TiOxNy) extends its absorption into the visible-light region.
- TiOxNy demonstrates effective visible-light photocatalytic activity for organic pollutant degradation.
- Optimizing nitrogen content, rutile phase, and surface area can enhance TiOxNy photocatalytic efficiency.
