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Fecha
2021-12-30
Derechos de acceso
info:eu-repo/semantics/openAccess
Título de la revista
ISSN de la revista
Título del volumen
Editorial
MDPI
Citas
Resumen
The combination of photocatalysis and membrane filtration in a single reactor has been proposed, since the photocatalytic treatment may degrade the pollutants retained by the membrane and reduce fouling. However, polymeric membranes can be susceptible to degradation by UV radiation and free radicals. In the present study, five commercial polymeric membranes were exposed to ultraviolet (UV) radiation before and after applying a sol–gel coating with TiO2 nanoparticles. Membrane stability was characterized by changes in hydrophilicity as well as analysis of soluble substances and nanoparticles detached into the aqueous medium, and by Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), and energy-dispersive X-ray spectrometry (EDS) for structural, morphological, and elemental distribution analysis, respectively. The TiO2 coating conferred photocatalytic properties to the membranes and protected them during 6 h of UV radiation exposures, reducing or eliminating chemical and morphological changes, and in some cases, improving their mechanical resistance. A selected commercial nanofiltration membrane was coated with TiO2 and used in a hybrid reactor with a low-pressure UV lamp, promoting photocatalysis coupled with cross-flow filtration in order to remove 17α-ethinylestradiol spiked into an aqueous matrix, achieving an efficiency close to 100% after 180 min of combined filtration and photocatalysis, and almost 80% after 90 min.
Descripción
The registered version of this article, first published in “Polymers, 14, 2022", is available online at the publisher's website: MDPI, https://doi.org/10.3390/polym14010124
La versión registrada de este artículo, publicado por primera vez en “Polymers, 14, 2022", está disponible en línea en el sitio web del editor: MDPI, https://doi.org/10.3390/polym14010124
Proyecto de Investigación PTDC/EQU-EPQ/29579/2017 de la 'Fundação para a Ciência e a Tecnologia en Portugal
Proyecto de Investigación PTDC/EQU-EPQ/29579/2017 de la 'Fundação para a Ciência e a Tecnologia en Portugal
Categorías UNESCO
Palabras clave
membrane stability, UV photodegradation, TiO2 coating, hybrid reactor, hormone removal
Citación
Labuto, G., Sanches, S., Crespo, J. G., Pereira, V. J., & Huertas, R. M. (2022). Stability of Polymeric Membranes to UV Exposure before and after Coating with TiO2 Nanoparticles. Polymers, 14(1), 124. https://doi.org/10.3390/polym14010124
Centro
Facultad de Ciencias
Departamento
Ciencias y Técnicas Fisicoquímicas