Titanium dioxide modification with cobalt oxide nanoparticles for photocatalysis

Liquid phase plasma (LPP) method was used to synthesize a photocatalyst that can respond to visible light by precipitating cobalt oxide nanoparticles on the surface of TiO₂ powders. Uniform precipitation of cobalt oxide nanoparticles on the surface of TiO₂ powders was observed, resulting in successful synthesis of Co oxide nanoparticles on TiO₂ photocatalysts (CTP). The CTP synthesized in this study showed a photocatalytic activity under visible blue light. However, its photocatalytic activity was lower than that of bare TiO₂ under UV light because the cobalt oxide precipitate acted as crystal defects deteriorating the catalytic activity.