TiO₂-based photocatalysts prepared by oxidation of TiN nanoparticles and their photocatalytic activities under visible light illumination

Chao Li^1,2，Weiyi Yang¹，Qi Li¹

1. Environment Functional Materials Division, Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences2. University of Chinese Academy of Sciences

摘 要：To develop TiO₂-based photocatalysts with visible light activity for better solar energy utilization, a simple flash oxidation method was developed by calcining commercial Ti N nanoparticle to prepare N-doped TiO₂ photocatalyst and Ti N/TiO₂ composite photocatalysts through the modulation of the calcination time and temperature. It was found that more energy and processing time were needed to prepare N-doped TiO₂ photocatalyst than that of Ti N/TiO₂ composite photocatalyst during this process, while Ti N/TiO₂ composite photocatalyst had a better visible light absorption/photocatalytic performance than that of N-doped TiO₂ photocatalyst prepared from the oxidation of the same Ti N precursor. Thus, the preparation of Ti N/TiO₂ composite photocatalyst from Ti N precursor should be a more preferred approach than the preparation of N-doped TiO₂ photocatalyst for visible-light-activated photocatalysis for its costeffectiveness.

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