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dc.contributor.authorBelekbir, S.
dc.contributor.authorEl Azzouzi, Mohammed
dc.contributor.authorEl Hamidi, A.
dc.contributor.authorRodríguez-Lorenzo, Laura
dc.contributor.authorSantaballa, J. Arturo
dc.contributor.authorCanle, Moisés
dc.date.accessioned2020-06-17T10:43:48Z
dc.date.available2020-06-17T10:43:48Z
dc.date.issued2020-05-22
dc.identifier.citationBelekbir, S.; El Azzouzi, M.; El Hamidi, A.; Rodríguez-Lorenzo, L.; Santaballa, J.A.; Canle, M. Improved Photocatalyzed Degradation of Phenol, as a Model Pollutant, over Metal-Impregnated Nanosized TiO₂. Nanomaterials 2020, 10, 996. https://doi.org/10.3390/nano10050996es_ES
dc.identifier.issn2079-4991
dc.identifier.urihttp://hdl.handle.net/2183/25725
dc.description.abstract[Abstract] Photocatalyzed degradation of phenol in aqueous solution over surface impregnated TiO₂ (M = Cu, Cr, V) under UV-Vis (366 nm) and UV (254 nm) irradiation is described. Nanosized photocatalyts were prepared from TiO₂-P25 by wet impregnation, and characterized by X-ray diffraction, X-ray fluorescence, transmission electron microscopy, UV-Vis diffuse reflectance spectroscopy, Raman spectroscopy, and adsorption studies. No oxide phases of the metal dopants were found, although their presence in the TiO₂-P25 lattice induces tensile strain in Cu-impregnated TiO₂-P25, whereas compressive strain in Cr- and V-impregnated TiO₂-P25. Experimental evidences support chemical and mechanical stability of the photocatalysts. Type IV N₂ adsorption–desorption isotherms, with a small H3 loop near the maximum relative pressure were observed. Metal surface impregnated photocatalysts are mesoporous with a similar surface roughness, and a narrow pore distribution around ca. 25 Å. They were chemically stable, showing no metal lixiviation. Their photocatalytic activity was followed by UV-Vis spectroscopy and HPLC–UV. A first order kinetic model appropriately fitted the experimental data. The fastest phenol degradation was obtained with M (0.1%)/TiO₂-P25, the reactivity order being Cu > V >> Cr > TiO₂-P25 under 366 nm irradiation, while TiO₂-P25 > Cu > V > Cr, when using 254 nm radiation. TOC removal under 366 nm irradiation for 300 min showed almost quantitative mineralization for all tested materials, while 254 nm irradiation for 60 min led to maximal TOC removal (ca. 30%). Photoproducts and intermediate photoproducts were identified by HPLC–MS, and appropriate reaction pathways are proposed. The energy efficiency of the process was analysed, showing UV lamps are superior to UVA lamps, and that the efficiency of the surface impregnated catalyst varies in the order Cu > V > Cr.es_ES
dc.description.sponsorshipThis research was partially supported by the Group of Chemical Reactivity & Photoreactivity at University and funded by the Spanish Ministerio de Economía y Competitividad through project CTQ2015-71238-R (MINECO/FEDER), and the regional government Xunta de Galicia (Project Grupo Potencial Crecemento (GPC) ED431B 2017/59), respectivelyes_ES
dc.description.sponsorshipXunta de Galicia; ED431B 2017/59es_ES
dc.language.isoenges_ES
dc.publisherMDPIes_ES
dc.relationinfo:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/CTQ2015-71238-R/ES/SOSTENIBILIDAD DE RECURSOS HIDRICOS: REDUCCION DE CONTAMINANTES ORGANICOS PERSISTENTES MEDIANTE UN SISTEMA COMBINADO DE HUMEDALES Y FOTOCATALISIS HETEROGENEA/
dc.relation.urihttps://doi.org/10.3390/nano10050996es_ES
dc.rightsAtribución 4.0 Internacionales_ES
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectPhenoles_ES
dc.subjectPhotocatalysises_ES
dc.subjectTitaniaes_ES
dc.subjectSurface impregnationes_ES
dc.subjectPhotodegradationes_ES
dc.subjectReaction mechanismes_ES
dc.subjectAdsorption analysises_ES
dc.subjectEnergy efficiencyes_ES
dc.titleImproved Photocatalyzed Degradation of Phenol, as a Model Pollutant, over Metal-Impregnated Nanosized TiO₂es_ES
dc.typeinfo:eu-repo/semantics/articlees_ES
dc.rights.accessinfo:eu-repo/semantics/openAccesses_ES
UDC.journalTitleNanomaterialses_ES
UDC.volume10es_ES
UDC.issue5es_ES
UDC.startPage996es_ES
dc.identifier.doi10.3390/nano10050996


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