AIMS Geosciences, 2017, 3(4): 498-513. doi: 10.3934/geosci.2017.4.498 Research article Special Issues

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

José Luis Sánchez-Salas, Alejandra Aguilar Ubeda, Beatriz Flores Gómez, Oscar Daniel Máynez Navarro, Miguel Ángel Méndez Rojas, Silvia Reyna Tellez, Erick R. Bandala

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

Received: , Accepted: , Published:

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

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ZnO-Fe₂O₃nanoparticles (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 UV_365nm 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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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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