Synthesis of Cr,N-codoped titania nanotubes and their visible-light-driven photocatalytic properties

- N,Cr-codoped TiO2 nanotubes were prepared via a two-step method.
- The TiO2NT kept tubular structures while doped with N and Cr and its BET was 176.58 m2/g.
- The highest photocatalytic activity could be realized when the nominal Cr doping was 10%.
- The energy band of NTB was 2.38 eV, which was smaller than TiO2NT's 3.20 eV. The sample of NTB exhibited the best photo-degradation activity.