NOVEL PHOTOCATALYTIC REACTORS BASED ON TITANIUM DIOXIDE ON A SILICA SUPPORT FOR AIR AND WATER TREATMENT

摘要

The type of reaction support and the method of preparation of photocatalyst and photocatalytic reactor are new. Reaction support for the treatment of fluids under the action of light consists of three-dimensional material, diffusing but not absorbing, comprising interconnected elements consisting essentially of silica. The structure of this material is permeable to circulation of fluid to be treated. The material may consists of silica cloth with flat or wrinkled surface, in which silica fibers are fused together by sintering, or of non-woven silica fibers, interconnected by sintering, with controlled space rate 60-95%. The material is glazed with regard to light sources, to facilitate entering of light into support structure. The support is surface-coated with fused-on silica particles in such way as to improve fixing of catalyst deposited on support. The catalyst deposit consists of titanium dioxide in anatase form. Independent claims are also included for 1) titanium dioxide gel used for impregnation of support and prepared as described below, which is stable and can be stored over long periods of time; 2) catalyst supported on support as claimed, characterized by strong BET surface, high adsorption capacity and endowed with remarkable bactericide properties; 3) use of supports as claimed in photoreactors with very low loss of charge under conditions of high debit of fluid; and 4) photoreactors using titanium dioxide catalyst on supports as claimed whose dimensions depend on adsorption capacity of catalyst used and not on chemical kinetics on produced reactions.