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A study concerning the Heliophotocatalytic Disinfection of Water (HPDW), in Solar Disinfection type systems (SODIS) is presented. Photocatalysts based on a commercial titanium dioxide (TiO2) and TiO2 obtained by the sol-gel method both modified with transition metals (Ag, Fe, Mo or Pd), were used. Results show that the combination of the SODIS technique with photocatalysis reduces the solar irradiation time exposure of a unidosis of infected water, when compared to the one needed using the SODIS technique alone. In addition, it was observed that both, the synthesis method and the nature of the metal modifying the TiO2 influence the efficiency of the photocatalyst evaluated in HPDW. Inclusion of Ag or Pd enhances the bactericide action of the HPDW system. Ag presents an additional effect besides the photocatalytic one due to its bacteriostatic properties, while Pd enhances the photoactivity due to its electronic properties.

Degradación Heliofotocatalítica de Escherichia coli en Sistemas tipo Desinfección SODIS, con Dióxido de Titanio Modificado