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Inactivation of Bacterial Spores and Vegetative Bacterial Cells by Interaction with ZnO-Fe2O3 Nanoparticles and UV Radiation

1 Department of Chemical and Biological Sciences. Sciences School. Universidad de las Américas Puebla. Ex-Hacienda de Santa Catarina Mártir. C.P. 72810. Cholula, Puebla, México
2 Division of Hydrologic Sciences, Desert Research Institute. Las Vegas, Nevada, USA

Special Issues: Water for an increasing population in a changing climate

ZnO-Fe2O3 nanoparticles (ZnO-Fe NPs) were synthesized and characterized by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and dynamic light scattering (DLS). The generation of chemical reactive hydroxyl radicals (OH) was measured spectrophotometrically (UV-Vis) by monitoring of p-nitrosodimethylaniline (pNDA) bleaching. Inactivation of E. coli and B. subtilis spores in the presence of different concentrations of ZnO-Fe NPs, under UV365nm or visible radiation, was evaluated. We observed the best results under visible light, of which inactivation of E. coli of about 90% was accomplished in 30 minutes, while B. subtilis inactivation close to 90% was achieved in 120 minutes. These results indicate that the prepared photocatalytic systems are promising for improving water quality by reducing the viability of water-borne microorganisms, including bacterial spores.
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