Photocatalytic Applications of Titanium Dioxide Nanostructures

Titanium dioxide (TiO₂) nanostructures have emerged as versatile materials for harnessing light energy to drive chemical transformations, offering a route to sustainable energy generation and environmental remediation. The intrinsic photocatalytic mechanism relies on absorption of ultraviolet or visible light to excite electrons from the valence band to the conduction band, generating electron–hole pairs that mediate redox reactions at the surface. Nanostructuring of TiO₂ into forms such as nanoparticles, nanotubes, nanosheets and hierarchical architectures increases specific surface area, enhances light harvesting and accelerates charge separation. Key challenges—including the wide intrinsic band gap, rapid recombination of photogenerated charges and limited activity under visible light—have been addressed through strategies such as elemental doping, noble-metal deposition, defect engineering (notably oxygen vacancies and Ti³⁺ centres) and construction of heterojunctions with other semiconductors or carbonaceous materials. These modifications extend light absorption into the visible region, promote efficient separation of electron–hole pairs and provide active sites for target reactions. Practical applications encompass solar water splitting for hydrogen production, photoreduction of carbon dioxide to value-added fuels, oxidative degradation of organic pollutants in water and air, photocatalytic coupling of methane and antimicrobial surfaces. The global significance of TiO₂ photocatalysis lies in its potential to deliver clean fuels, mitigate environmental contamination and underpin decentralised treatment technologies for water and air purification.

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Photocatalytic Applications of Titanium Dioxide Nanostructures publication trend

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Technical terms

Photocatalysis: Light-driven acceleration of chemical reactions at the surface of a semiconductor material.

Band gap: Energy difference between the valence band and conduction band that determines the wavelengths of light a material can absorb.

Oxygen vacancy: A point defect in the TiO₂ lattice where an oxygen atom is absent, creating localized electronic states within the band gap.

Heterojunction: An interface between two semiconductors with differing band structures that facilitates directional separation of photogenerated charges.

Charge separation: The process by which photogenerated electrons and holes are spatially or energetically prevented from recombining, enhancing photocatalytic efficiency.

References

1. Oxygen vacancy self-doped single crystal-like TiO 2 nanotube arrays for efficient light-driven methane non-oxidative coupling. Journal of Advanced Ceramics (2023).
2. Modification strategies of TiO2 for potential applications in photocatalysis: a critical review. Green Chemistry Letters and Reviews (2018).
3. One‐dimensional TiO2 Nanotube Photocatalysts for Solar Water Splitting. Advanced Science (2016).
4. Photocatalytic antibacterial performance of TiO2 and Ag-doped TiO2 against S. aureus. P. aeruginosa and E. coli. Beilstein Journal of Nanotechnology (2013).