The superior photocatalytic activity of Nb doped TiO/g-CN direct Z-scheme system for efficient conversion of CO into valuable fuels.

In this study, we firstly aimed to use Nb as dopant to dope into the TiO lattice in order to narrow band gap energy or enhance photocatalytic activity of the Nb-TiO. Then, the prepared Nb-TiO was combined with g-CN to establish Nb-TiO/g-CN direct Z-scheme system for superior reduction of CO into valuable fuels even under visible light. The obtained results indicated that the band gap energy of the Nb-TiO (2.