Dominated factors for high performance of Fe3+ grafted metal doped TiO2 based photocatalysts

- Acceptor state of doped metal ion was most important factor for high performance.
- Acceptor state formed close to redox potential of grafted Fe3+ was most effective.
- Donor state of doped metal ion was less effective than acceptor state.
- Two-step electron excitation via defect level could not contribute the performance.