Photo Catalytic Oxidation is a condition generated by titanium dioxide exposed in ultraviolet ray of a certain wave length, measuring as strong as 10,000 times of sunlight. It decomposes harmful substances (bacteria, viruses, molds, fungal spores and allergens) and odorous gases (oil paints, dyestuff, gas and smoke) into harmless carbohydrates, which helps to sterilize and deodorize instantly.
PCO was jointly developed by Sandia Lab and National Renewable Energy Lab, and was first applied in the Gulf War in 1991 to prevent biochemical wars.
As the most effective biochemical purification technique, PCO redox reaction produces high-oxidable free hydroxyls, which oxidate various organics and some inorganics. It breaks the cytomembranes of bacteria and proteins that solidify virus. It also decompose organic pollutants such as formaldehyde and xylene into water and carbon dioxide. The oxidability of PCO is 206% higher than that of chlorine and 157% of hydrogen peroxide, which amounts to 10,000 times of sunlight. PCO has a high effect on sterilization, deodorization, mould proof, antifouling, self-cleaning and purification.
PCO technique usually works with HEPA or active carbon filters to get the best purification effect.