“Photo” is derived from the Greek word meaning “light”. Photocatalyst thus implies a catalyst that requires ‘light’ energy to modify the rate of a chemical reaction.

When photocatalyst is exposed to light in the presence of water vapor, two highly reactive substances are formed: hydroxyl radicals [OH] and a superoxide anion [O2-1]. It allows the oxidation of airborne Volatile Organic Compounds (VOCs) and toxic organic matter into carbon dioxide and water at room temperature with UV or near-UV light source. It does not need a special energy and use only clean energy in ordinary life