Synthesis of N-doped titanium oxide by hydrothermal treatment

摘要

N-doped TiO₂ nanoparticles have been prepared by continuous or batch treatment of the colloidal TiO₂ nanoparticles under hydrothermal conditions with formamide, nitric acid, ammonia or triethylamine. The optical absorption tail of the obtained photocatalysts near the band gap extended to the visible region around λ = 500 nm. The efficiency of nitrogen doping was strongly dependent on the kind of nitrogen compounds, treatment method as well as treatment temperature. The most effective N-doping could be accomplished by the batch treatment with a small amount of triethylamine, which showed the efficient photocatalytic activity for both the reduction of Ag+ ions and the degradation of methylene blue under visible light irradiation.