Gd3+, N-codoped trititanate nanotubes: Preparation, characterization and photocatalytic activity

▶ Gd3+, N-codoped trititanate nanotubes have been prepared by hydrothermal and ion-exchanging method. ▶ Synergistic reaction occurs between Gd3+ and N co-doping. ▶ The photocatalytic activity of TiO2 has been enhanced significantly under visible light irradiation after Gd3+, N-codoping.