Artículo
Improved stability in SBA-15 mesoporous materials as catalysts for photo-degradation processes
Elías, Verónica Rita
; Ferrero, Gabriel Orlando
; Oliveira, Rafael Gustavo
; Eimer, Griselda Alejandra
Fecha de publicación:
09/2016
Editorial:
Elsevier Science
Revista:
Microporous and Mesoporous Materials
ISSN:
1387-1811
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Resumen
SBA-15 materials were modified with Cr, Ni and Fe and characterized by ICP, SAXS, XRD, N2 adsorption, TPR and UV–Vis DRS. Their photo-catalytic activity was evaluated for the degradation of Acid Orange 7 (AO7) in aqueous suspensions irradiated by artificial UV–Vis light. The results showed that the Cr-modified catalyst exhibited the highest activity. The presence of Cr6+ highly dispersed on the internal surface of the SBA-15 structure would be responsible for this observed behavior. Then, when TiO2 was loaded on this solid, the photo-activity was increased due to a heterojunction effect between the two metals. Moreover, the TiO2 cover resulted in the Cr species protection leading to a notable decrease of the Cr leaching into the reaction medium. In addition, comparing with the already reported results for modified MCM-41 catalysts, the solid synthesized here allowed achieving the solution biodegradability in shorter irradiation periods and could be re-used even after four cycles without loss of activity. Thus, the high performance of this material leads to make it a very promising photo-catalyst for pre-treatment of recalcitrant contaminants present in aqueous effluents.
Palabras clave:
Nanostructures
,
Stability
,
Metallic Species
,
Catalytic Properties
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Identificadores
Colecciones
Articulos(CITEQ)
Articulos de CENTRO DE INVESTIGACION Y TECNOLOGIA QUIMICA
Articulos de CENTRO DE INVESTIGACION Y TECNOLOGIA QUIMICA
Citación
Elías, Verónica Rita; Ferrero, Gabriel Orlando; Oliveira, Rafael Gustavo; Eimer, Griselda Alejandra; Improved stability in SBA-15 mesoporous materials as catalysts for photo-degradation processes; Elsevier Science; Microporous and Mesoporous Materials; 236; 9-2016; 218-227
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