Photocatalysis is the activity occurring when a light source interacts with the surface of semiconductor materials, the so called photocatalysts. During this process, there must be at least two simultaneous reactions occurring, oxidation from photogenerated holes, and reduction from photogenerated electrons. Photocatalysis is a type of catalysis that results in the modification of the rate of a photoreaction - a chemical reaction that involves the absorption of light by one or more reacting species - by adding substances that participate in the chemical reaction without being consumed. Photocatalysis can be successfully used in a real environment to decompose pollutants and enhance the quality of the atmospheric air. Photocatalysis can therefore be used in the building sector to improve indoor air quality.
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