Decomposition of 3-chlorophenol on nitrogen modified TiO2 photocatalysts

► N-modified TiO2 for 3-chlorophenol degradation under UV and Vis light. ► Improvement of TiO2/N photoactivity with an increase of calcination temperature. ► Improvement of 3-chlorophenol photodegradation rate with pH increase from 3 to 7. ► Stable photocatalytic activity of N-modified photocatalysts in repeated cycles.