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Título:
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Photocatalytic degradation of contaminants of concern with composite NF-TiO2 films under visible and solar light
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Autores:
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Barndok, Helen ;
Peláez, M. ;
Han, C. ;
Platten III, W.E. ;
Campo, P. ;
Hermosilla, Daphne ;
Blanco, Ángeles ;
Dionysiu, D.D.
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Tipo de documento:
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texto impreso
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Editorial:
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Springer, 2013
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Dimensiones:
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application/pdf
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Nota general:
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info:eu-repo/semantics/openAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Química: Agua
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Materia = Ciencias: Química: Ingeniería química
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Materia = Ciencias: Química: Residuos
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Tipo = Artículo
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Resumen:
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This study reports the synthesis and characterization of composite nitrogen and fluorine co-doped titanium dioxide (NF-TiO2) for the removal of contaminants of concern (COCs) in wastewater under visible and solar light. Monodisperse anatase TiO2 nanoparticles of different sizes and Evonik P25 were assembled to immobilized NF-TiO2 by direct incorporation into the sol-gel or by the layer-by-layer technique. The composite films were characterized with X-ray diffraction, high resolution-transmission electron microscopy, environmental scanning electron microscopy, and porosimetry analysis. The photocatalytic degradation of atrazine, carbamazepine, and caffeine was evaluated in a synthetic water solution and in an effluent from a hybrid biological concentrator reactor (BCR). Minor aggregation and improved distribution of monodisperse titania particles was obtained with NF-TiO2-monodisperse (10 and 50 nm) from the layer-by-layer technique than with NF-TiO2 + monodisperse TiO2 (300 nm) directly incorporated into the sol. The photocatalysts synthesized with the layer-by-layer method achieved significantly higher degradation rates in contrast with NF-TiO2-monodisperse titania (300 nm) and slightly faster values when compared with NF-TiO2-P25. Using NF-TiO2 layer-by-layer with monodisperse TiO2 (50 nm) under the solar light irradiation, the respective degradation rates in synthetic water and BCR effluent were 14.6 and 9.5·10-3 min-1 for caffeine, 12.5 and 9.0·10-3 min-1 for carbamazepine, and 10.9 and 5.8·10-3 min-1 for atrazine. These results suggest that the layer-by-layer technique is a promising method for the synthesis of composite TiO2-based films compared to the direct addition of nanoparticles into the sol.
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En línea:
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https://eprints.ucm.es/id/eprint/29258/1/Photocatalytic%20degradation%20of%20contaminants%20with%20NF%20TiO2%20films_Barndok_2013.pdf
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