Photocatalysis
| Also Known As | Heterogeneous photocatalysis, TiO₂ photocatalysis, advanced oxidation process (photocatalytic) |
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What is Photocatalysis?
Photocatalysis is the acceleration of a chemical reaction by a photocatalyst — a substance that absorbs light and uses that energy to drive a chemical reaction while itself being regenerated. The most common photocatalyst is titanium dioxide (TiO₂). Upon UV/visible light absorption, TiO₂ generates electron-hole pairs that react with water and oxygen to produce reactive oxygen species (OH•, O₂•⁻) that can oxidize organic pollutants.
Properties & Characteristics
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
Photocatalysis is the acceleration of a chemical reaction by a photocatalyst — a substance that absorbs light and uses that energy to drive a chemical reaction while itself being regenerated. The most common photocatalyst is titanium dioxide (TiO₂). Upon UV/visible light absorption, TiO₂ generates electron-hole pairs that react with water and oxygen to produce reactive oxygen species (OH•, O₂•⁻) that can oxidize organic pollutants.
Air and water purification (degrading organic pollutants). Self-cleaning surfaces (TiO₂ coatings on glass, tiles). Antibacterial surfaces. Solar hydrogen production (water splitting). CO₂ reduction to fuels. Environmental remediation. Disinfection of water.
UV sources used in photocatalysis: UV-C germicidal — eye and skin hazard. TiO₂ nanoparticles: potential respiratory hazard. Photocatalytic intermediates can be more toxic than parent compounds transiently. Oxidizing radicals (OH•) are non-selective — can damage materials.