Solar photocatalysis is a promising technology for the disinfection of water and wastewater; indeed it is an economic and clean methodology working at low temperature. Photocatalytic removal of bacteria has been investigated for the purification of wastewater. TiO₂ is the most used photocatalyst for this purpose and it has been found to be able to decompose a large variety of organic compounds and also bacteria. The photocatalytic efficiency of TiO₂ is greatly influenced by the surface area exposed to the light irradiation and also by its ability to adsorb the organic molecule to be degraded. The use of TiO₂ in suspension is efficient but the catalyst must be removed from the solutions after the treatment. The fixation of TiO₂ powder on porous materials of larger particle size and high surface areas, such as zeolites, seems to be the most suitable method in view of the sense and shoot approach to increase the efficiency. In the present study, we have prepared, characterised and tested over zeolites supported TiO₂ samples for the disinfection of two kinds of bacteria (Salmonelle and E. coli). Photocatalysts were prepared by supporting TiO₂ (5 wt %) on Hβ or HZSM-5 supports. The tests were performed irradiating 75 ml of Salmonelle or E. coli aqueous solution with solar light in the presence and also in the absence of the photocatalysts. The typical results obtained are shown in Figure-1 and it is evident that the presence of photocatalyst greatly increases the rate of E. coli deactivation.