Photocatalytic activation of peroxymonosulfate using ilmenite (FeTiO3) for Enterococcus faecalis inactivation
Entity
UAM. Departamento de Ingeniería QuímicaPublisher
ElsevierDate
2022-10-01Citation
10.1016/j.jece.2022.108231
Journal of Environmental Chemical Engineering 10.5 (2022): 108231
ISSN
108231 (online)DOI
10.1016/j.jece.2022.108231Funded by
PGM acknowledges Escuela Técnica Superior de Ingenieros Industriales (UPM) for the project ETSII-UPM20–03. SGR acknowledges UPM for the predoctoral contract granted within the ’Programa Propio’. JRC acknowledges Comunidad de Madrid for funding the research project IN_REUSE (APOYO-JOVENES-X5PKL6–88-KZ46KU), and also by the pluriannual agreement with the Polytechnic University of Madrid in the line of action Programme of Excellence for University Teaching StaffEditor's Version
https://doi.org/10.1016/j.jece.2022.108231Subjects
Alcohols; Charge Transfer; Ilmenite; Iron Compounds; Titanium Compounds; Wastewater Reclamation; QuímicaRights
© 2022 The Author(s)Abstract
In this work, a raw and low cost mineral, ilmenite (FeTiO3), has been tested for the first time as a photocatalyst paired with peroxymonosulfate (HSO5-; PMS) for the inactivation of Enterococcus faecalis as an alternative to conventional treatments to disinfect wastewater for reuse. The influence of some operational parameters such as reagent dosage, catalyst concentration, initial pH, or flow rate was also studied and optimized. After several tests, the scarce pure photoactivity under UV-A was remarked by ilmenite because of its high iron content, which favors photogenerated charge recombination. However, ilmenite activity was highly promoted when combined with low concentrations of PMS and UV-A light, reaching total inactivation of Enterococcus faecalis in 120 min. Quenching tests were performed using methanol, tert-butyl alcohol, furfuryl alcohol, and Cu(II) to assess the main reactive species involved in the disinfection process determining the critical role of both HO·and SO4·- radicals in the process. Finally, the influence of the water matrix was also evaluated by studying the effect of water hardness and the presence of nutrients on the system. Overall, the PMS/Ilmenite/UV-A system yielded promising results with a total removal of Enterococcus faecalis in 120 min. However, it also showed the need for further study and understanding of the disinfection mechanism to achieve the same level of performance in real wastewater
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Google Scholar:García Muñoz, Patricia
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Lopez-Maxías, Cecilia
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Guerra-Rodríguez, Sonia
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Carbajo Olleros, Jaime
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Casas de Pedro, José Antonio
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Rodríguez-Chueca, Jorge
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