Effect of State of Fe on Photocatalytic Removal of NOx over Visible Light Responsive Fe/TiO2 Catalyst

This study demonstrates the incorporated Fe ions can substitute the octahedrally coordinated Ti⁴⁺ ions in TiO₂ lattice, which extends the visible light absorption and hence promotes the formation of electron-hole pair. Furthermore, the doping of Fe increases the electron-hole separation efficiency because the Fe³⁺ can act as an electron-trapped agent.