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Self-cleaning test of doped TiO2-coated Glass plates under solar exposure / Medina-Valtierra, Jorge in Industrial & engineering chemistry research, Vol. 48 N°2 (Janvier 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°2 (Janvier 2009) . - p. 598–606 Titre : Self-cleaning test of doped TiO2-coated Glass plates under solar exposure Type de document : texte imprimé Auteurs : Medina-Valtierra, Jorge, Auteur ; Frausto-Reyes, Claudio, Auteur ; Jorge Ramírez-Ortiz, Auteur ; Gabriela Camarillo-Martínez, Auteur Année de publication : 2009 Article en page(s) : p. 598–606 Note générale : chemical engineering Langues : Anglais (eng) Mots-clés : photodegradation Résumé : Photocatalytic films of TiO2 doped with metal oxides, ZnFe2O4, ZnO, and CuO, were formed on glass plates by the ultraspinning method from Ti(IV) isopropoxide-based sol−gels. To test the self-cleaning properties of TiO2 films on glass, a layer of crystalline fluoranthene, a polycyclic aromatic compound, was placed over the glass by spraying and then exposing it to solar irradiation. The covering of fluoranthene on the 1 wt % metal oxide-doped anatase films was degraded nearly to 100% at 20 h of exposure time. Thus, the coated-glass transparency was recovered totally between 35 and 52 h of exposure time for the doped anatase film, which did not occur with anatase on glass, even after more than 85 h of solar irradiation. For some samples, a correlation was found between the weight losses of the solid compound and the intensity of the Raman vibration at 671 cm−1 during photocatalytic degradation. After 20 h of solar exposure, while the presence of fluoranthene was not detected by Raman spectroscopy, some glass plates presented ultrathin zones of degradation products. Regarding fluoranthene photodegradation and weight loss in the results when the different metal-oxide dopants were compared, a sequential efficiency was observed: ZnFe2O4 > CuO > ZnO. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8008555 [article] Self-cleaning test of doped TiO2-coated Glass plates under solar exposure [texte imprimé] / Medina-Valtierra, Jorge, Auteur ; Frausto-Reyes, Claudio, Auteur ; Jorge Ramírez-Ortiz, Auteur ; Gabriela Camarillo-Martínez, Auteur . - 2009 . - p. 598–606. chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°2 (Janvier 2009) . - p. 598–606 Mots-clés : photodegradation Résumé : Photocatalytic films of TiO2 doped with metal oxides, ZnFe2O4, ZnO, and CuO, were formed on glass plates by the ultraspinning method from Ti(IV) isopropoxide-based sol−gels. To test the self-cleaning properties of TiO2 films on glass, a layer of crystalline fluoranthene, a polycyclic aromatic compound, was placed over the glass by spraying and then exposing it to solar irradiation. The covering of fluoranthene on the 1 wt % metal oxide-doped anatase films was degraded nearly to 100% at 20 h of exposure time. Thus, the coated-glass transparency was recovered totally between 35 and 52 h of exposure time for the doped anatase film, which did not occur with anatase on glass, even after more than 85 h of solar irradiation. For some samples, a correlation was found between the weight losses of the solid compound and the intensity of the Raman vibration at 671 cm−1 during photocatalytic degradation. After 20 h of solar exposure, while the presence of fluoranthene was not detected by Raman spectroscopy, some glass plates presented ultrathin zones of degradation products. Regarding fluoranthene photodegradation and weight loss in the results when the different metal-oxide dopants were compared, a sequential efficiency was observed: ZnFe2O4 > CuO > ZnO. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8008555