In chemistry, photocatalysis is the acceleration of a photoreaction in the presence of a catalyst. In catalysed photolysis, light is absorbed by an adsorbed substrate. In photogenerated catalysis, the photocatalytic activity (PCA) depends on the ability of the catalyst to create electron–hole pairs, which generate free radicals (e.g. hydroxyl radicals: •OH) able to undergo secondary reactions. Its practical application was made possible by the discovery of water electrolysis by means of titanium dioxide.
TiO2 photocatalyst coating is a kind of environmental friendly coatings. It has been widely applied to many fields, such as water treatment, cosmetics, ceramic, plastic, architecture etc.. The major mechanism of titanium dioxide photocatalyst coating is that photocatalyst absorbs light and then occurs a series of photocatalytic reactions. In this article, the synthesis method and application of photocatalytic coating were introduced, in order to provide references for other scholars. Concluding bactericidal (mildew-proof) coating, NOx degradation coating, formaldehyde and benzene degradation coating, self-cleaning coating and so on.
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