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Characterization and photocatalytic activity of N-doped TiO2 prepared by thermal decomposition of Ti-melamine complex
Balasubramanian Viswanathan, Ram Prasad Viswanath
Published in
Volume: 74
Issue: 3-4
Pages: 307 - 312
Nitrogen doped spherical TiO2 has been prepared by thermal decomposition of Ti-melamine complex in air atmosphere. A clear shift in the onset light absorption from UV region (<400) to visible region (>520 nm) has been observed for the N-doped samples. It has been deduced from the optical absorption spectra that the higher calcination temperature results in the decrease in the amount of N-doping. The XRD results revealed the phase transition of TiO2 from anatase to rutile crystalline phase, starting at calcination temperature ≥600 °C. The electron microscopic images reveal the formation of spherical and flakes of TiO2 nanocrystals (25 nm). The chemical nature of N in the N-TiO2 has been evolved through X-ray photoelectron spectroscopy. The presence of different types of N species have been observed corresponding to different oxidation states and the presence of Ti-N and O-Ti-N have been confirmed from the observed binding energy values. Photocatalytic decomposition of methylene blue has been carried out both in the visible region and UV + visible region. In the visible region, N-TiO2 showed higher activity compared to the undoped commercial TiO2 (Degussa P25). © 2007 Elsevier B.V. All rights reserved.
About the journal
JournalApplied Catalysis B: Environmental
Open AccessNo
Concepts (12)
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    Air atmosphere
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    Anion doping
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    Visible light absorption
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    Absorption spectra
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    Doping (additives)
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    Light absorption
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    Phase transitions
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    Titanium dioxide
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    Catalyst activity