Identificador persistente para citar o vincular este elemento: http://hdl.handle.net/10662/20403
Títulos: Solar photo-ozonation: A novel treatment method for the degradation of water pollutants
Autores/as: Chávez Águedo, Ana María
Rey Barroso, Ana
Beltrán Novillo, Fernando Juan
Álvarez Peña, Pedro Modesto
Palabras clave: AOP;Contaminantes emergentes;Emerging contaminants;Foto-ozonización;Photo-ozonation;Radiación UVA-visible;UVA-visible radiation;Tratamiento de agua;Water treatment
Fecha de publicación: 2016
Editor/a: Elsevier
Resumen: The decomposition of aqueous ozone by UV–vis radiation has been investigated with focus on the impact of ozone photolysis on the degradation of water pollutants during solar ozonation processes. The apparent first-order rate constants of the decomposition of ozone (kobs) have been determined at various pHs in the 4–9 range using radiation of different wavelengths in the UV–vis range. It was found that UVA–visible radiation (λ>320nm) highly enhanced ozone decomposition, especially at pH 4, for which kobs was three-folded with respect to the process in the absence of radiation. Hydrogen peroxide was identified as a main intermediate of ozone photo-decomposition at pH 4. Experiments of degradation of oxalic acid by ozone showed that solar irradiation brings about an increase in the hydroxyl radical to ozone exposures ratio (Rct). Finally, photo-ozonation (λ>300nm) was shown advantageous over single ozonation in the mineralization of a selection of emerging contaminants (metoprolol, ibuprofen, N,N-diethyl-meta-toluamide and clofibric acid) in both ultrapure water and a synthetic secondary effluent. Thus, TOC removal in 2-h treatments increased from 10 to 25% in the absence of radiation to about 50% in the presence of radiation.
Descripción: Publicado en: Journal of Hazardous Materials. vol. 317, pp.36-43. https://doi.org/10.1016/j.jhazmat.2016.05.050
URI: http://hdl.handle.net/10662/20403
ISSN: 0304-3894
DOI: 10.1016/j.jhazmat.2016.05.050
Colección:DIQQF - Artículos

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