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Escherichia coli Inactivation in Fresh Water Through Photocatalysis with TiO2‐Effect of H2O2 on Disinfection Kinetics
The purpose of this work was to study the efficiency of TiO2 in the inactivation of Escherichia coli present in natural surface water. TiO2 is the most extensively studied semiconductor catalyst used in combination with solar irradiation due to its high photoactivity, low cost, chemical and biological stability, and harmlessness. The processes studied in this research work were: (i) UV‐Vis irradiation; (ii) 0.04 mM H2O2/UV‐Vis irradiation; (iii) 1 g/L TiO2/UV‐Vis irradiation; and (iv) 1 g/L TiO2/0.04 mM H2O2/UV‐Vis irradiation. The results showed that the process with TiO2/UV‐Vis irradiation reached the highest levels of inactivation of E. coli, around 3.30 log, after 30 min of contact time. In contrast, the addition of H2O2 to the photocatalytic treatment not only did not increase the inactivation result, it actually decreased it. After 30 min of contact time, the inactivation of E. coli was 0.97 log for the process with 1 g/L TiO2/0.04 mM H2O2/UV‐Vis irradiation. The fitting of experimental values to the corresponding equations through nonlinear regression techniques was carried out with Microsoft® Excel Solver and GInaFiT. The kinetic modeling of inactivation values is a powerful tool for identifying the influence of the different variables present in disinfection treatments.
Escherichia coli Inactivation in Fresh Water Through Photocatalysis with TiO2‐Effect of H2O2 on Disinfection Kinetics
The purpose of this work was to study the efficiency of TiO2 in the inactivation of Escherichia coli present in natural surface water. TiO2 is the most extensively studied semiconductor catalyst used in combination with solar irradiation due to its high photoactivity, low cost, chemical and biological stability, and harmlessness. The processes studied in this research work were: (i) UV‐Vis irradiation; (ii) 0.04 mM H2O2/UV‐Vis irradiation; (iii) 1 g/L TiO2/UV‐Vis irradiation; and (iv) 1 g/L TiO2/0.04 mM H2O2/UV‐Vis irradiation. The results showed that the process with TiO2/UV‐Vis irradiation reached the highest levels of inactivation of E. coli, around 3.30 log, after 30 min of contact time. In contrast, the addition of H2O2 to the photocatalytic treatment not only did not increase the inactivation result, it actually decreased it. After 30 min of contact time, the inactivation of E. coli was 0.97 log for the process with 1 g/L TiO2/0.04 mM H2O2/UV‐Vis irradiation. The fitting of experimental values to the corresponding equations through nonlinear regression techniques was carried out with Microsoft® Excel Solver and GInaFiT. The kinetic modeling of inactivation values is a powerful tool for identifying the influence of the different variables present in disinfection treatments.
Escherichia coli Inactivation in Fresh Water Through Photocatalysis with TiO2‐Effect of H2O2 on Disinfection Kinetics
Rodríguez‐Chueca, Jorge (author) / Ormad, Maria Peña (author) / Mosteo, Rosa (author) / Canalis, Saúl (author) / Ovelleiro, José Luis (author)
CLEAN – Soil, Air, Water ; 44 ; 515-524
2016-05-01
11 pages
Article (Journal)
Electronic Resource
English
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