A chemical reaction that is accelerated by a substance (photocatalyst) activated by the absorption of light, used in pollution control and water purification

Greek phos (light) + katalysis (dissolution)

Light-driven catalysis Photo-oxidation
Thermal catalysis
"Photocatalytic coatings on building surfaces can decompose air pollutants like NOx when exposed to sunlight, offering a passive pollution-reduction technology for Indian cities."

Use in GS3 (science and technology, pollution abatement) when discussing innovative clean-tech solutions. Relevant to smart cities, air quality management, and green chemistry.

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