Abstract

VELASCO, Edwing; MORENO, Andrea L  and  GIRALDO, Sonia A. Effect of the Presence of Inorganic Salts on the Photocatalytic Inactivation of E. Coli in Water. ing.cienc. [online]. 2013, vol.9, n.17, pp.193-208. ISSN 1794-9165.

This article presents the effect of inorganic salts MgSO₄, NaCl and CaCO₃on the photocatalytic water disinfection. TiO₂-P25 was used as a photocatalyst, and E. Coli was used as a contaminant. Disinfection tests were performed by controlling lighting of batch reactors loaded with contaminated water, salts and TiO₂. The results of these tests were used to determine the kinetic parameters of a type Langmuir-Hinshelwood model. It was found that the salts have a strong influence on the photocatalytic inactivation of E. Coli and that each salt and its concentration affect disinfection differently in the following order: NaCl>CaCO₃ >>MgSO₄. Additionally, the value of the calculated parameters was different for each salt, showing that the salts affect the process by several mechanisms related to the ion-bacteria interactions, ion-oxidizing species and ion-TiO₂.

Keywords : photocatalysis; TiO₂; disinfection; inorganic salts; kinetic.

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