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

摘要

To develop TiO_2-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 TiO_2 photocatalyst and Ti N/TiO_2 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 TiO_2 photocatalyst than that of Ti N/TiO_2 composite photocatalyst during this process, while Ti N/TiO_2 composite photocatalyst had a better visible light absorption/photocatalytic performance than that of N-doped TiO_2 photocatalyst prepared from the oxidation of the same Ti N precursor. Thus, the preparation of Ti N/TiO_2 composite photocatalyst from Ti N precursor should be a more preferred approach than the preparation of N-doped TiO_2 photocatalyst for visible-light-activated photocatalysis for its costeffectiveness.