Photocatalytic degradation of contaminants of concern with composite NF-TiO2 films under visible and solar light



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Barndok, Helen and Peláez, M. and Han, C. and Platten III, W.E. and Campo, P. and Hermosilla, Daphne and Blanco, Ángeles and Dionysiu, D.D. (2013) Photocatalytic degradation of contaminants of concern with composite NF-TiO2 films under visible and solar light. Environmental Science and Pollution Research, 20 (6). pp. 3582-3591. ISSN 0944-1344 (Print) 1614-7499 (Online)

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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.

Item Type:Article
Uncontrolled Keywords:NF-TiO2, Monodisperse, Sol-gel method, Carbamazepine,Atrazine, Caffeine, TiO2 photocatalysis, Solar, Visible light, Contaminants, Emerging, Concern, Water, Reuse
Subjects:Sciences > Chemistry > Water
Sciences > Chemistry > Chemical engineering
Sciences > Chemistry > Waste products
ID Code:29258
Deposited On:18 Mar 2015 08:12
Last Modified:18 Mar 2015 12:44

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