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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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Keywords Drinking water; nanoparticles; photocatalysis; hydroxyl radicals; zinc oxide; iron oxide; Bacterial inactivation; Bacterial spore inactivation

Citation: José Luis Sánchez-Salas, Alejandra Aguilar Ubeda,Beatriz Flores Gómez, Oscar Daniel Máynez Navarro, Miguel Ángel Méndez Rojas, Silvia Reyna Tellez, Erick R. Bandala. Inactivation of Bacterial Spores and Vegetative Bacterial Cells by Interaction with ZnO-Fe2O3 Nanoparticles and UV Radiation. AIMS Geosciences, 2017, 3(4): 498-513. doi: 10.3934/geosci.2017.4.498


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Copyright Info: 2017, José Luis Sánchez-Salas, et al., licensee AIMS Press. This is an open access article distributed under the terms of the Creative Commons Attribution Licese (http://creativecommons.org/licenses/by/4.0)

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