Photocatalysis

Photo catalysis is a photo-activated chemical reaction that occurs when free radical mechanisms are triggered when a substance comes into contact with photons with adequate energy levels. The term photo catalyst is made up of two words: photo, which refers to a photon, and catalyst, which refers to a chemical that changes the rate of a reaction when it is present. Photocatalysts are materials that, when exposed to light, change the rate of a chemical reaction.