Photocatalytic Properties of Iron-Doped Titanium Dioxide Nanoparticles

Iron-doped titanium dioxide (Fe–TiO₂) nanoparticles represent a versatile class of photocatalysts whose activity under ultraviolet and visible light has been significantly enhanced through controlled incorporation of iron ions into the TiO₂ lattice. Doping with iron introduces intermediate energy levels within the band gap, reducing the effective band gap energy and extending light absorption into the visible spectrum. At low dopant concentrations, Fe³⁺ ions preferentially occupy surface positions, facilitating charge separation by providing interfacial pathways for photogenerated electrons and holes. This mitigates rapid recombination and promotes oxidation–reduction reactions at the nanoparticle surface. Optimal iron loadings balance the beneficial surface effects against the detrimental formation of recombination centres in the bulk. Morphology and phase composition—most often anatase, occasionally mixed with rutile—play a critical role in determining surface area, light harvesting, and adsorption of target molecules. Practical applications range from degradation of organic contaminants in wastewater to photoelectrochemical water splitting for hydrogen production, with ongoing research focusing on bespoke synthesis routes to optimise iron dispersion, crystallinity and stability under operational conditions.

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Technical terms

Photocatalyst: A material that accelerates chemical reactions upon light irradiation without undergoing permanent change.

Band gap energy: The energy difference between the valence and conduction bands in a semiconductor, determining the wavelengths of light it can absorb.

Anatase: A tetragonal crystalline phase of TiO₂ known for high photocatalytic activity due to its favourable electronic properties.

Charge carrier recombination: The undesirable process by which photogenerated electrons and holes recombine, reducing photocatalytic efficiency.

Visible light absorption: The capture of photons within the 400–700 nm range, essential for utilising solar radiation in photocatalysis.

References

1. Enhanced Fe-TiO2 Solar Photocatalysts on Porous Platforms for Water Purification. Nanomaterials (2022).
2. Synthesis and Characterization of Iron-Doped TiO2 Nanoparticles Using Ferrocene from Flame Spray Pyrolysis. Catalysts (2021).
3. Visible Light-Driven Photocatalytic Activity and Kinetics of Fe-Doped TiO2 Prepared by a Three-Block Copolymer Templating Approach. Materials (2021).