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Visible-Light Photoactivity of Nitrogen-Doped TiO2: Photo-oxidation of HCO2H to CO2 and H2O
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Abstract
Nitrogen-doped TiO2 was synthesized by high-temperature exposure of TiO2 to ammonia. The catalytic efficiency was tested by monitoring the photocatalytic degradation of formate (HCO2-) to CO2 and H2O under visible-light irradiation. The N-doped TiO2 powders were found to be active for the degradation of formic acid under visible light. However, the catalytic efficiency of the N-doped TiO2 under UV light alone is less than that of the pure TiO2 starting material. FTIR evidence indicates that the visible-light-active N-doped TiO2 has defect sites in the form of Ti−N triple bonds and that the increase of these sites leads to a loss of crystallinity that accounts for the reduced photocatalytic activity under UV irradiation. An optimal synthesis temperature of 550 °C was determined as a balance point between catalyst crystallinity and the presence of defect sites that absorb visible-light photons.
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This article has been cited by 9 ACS Journal articles (5 most recent appear below).
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History
- Published In Issue October 25, 2007
- Received June 26, 2007
Revised August 4, 2007
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