Improved visible light photocatalytic activity of fluorine and nitrogen co-doped TiO2 with tunable nanoparticle size

- The particle sizes of the prepared samples were tunable.
- The economic titanium sulfate (Ti(SO4)2) was used as precursor.
- Co-doped catalyst exhibited high photocatalytic activity.
- The synergistic effect of the two nonmetal elements was investigated.
- Potential degradation mechanism was proposed.