Artículos de revistas
Photocatalytic thin films containing TiO 2:N nanopowders obtained by the layer-by-layer self-assembling method
Fecha
2012Registro en:
Applied Surface Science, Volumen 258, Issue 6, 2018, Pages 2103-2106
01694332
10.1016/j.apsusc.2011.03.150
Autor
Rojas-Blanco, L.
Urzúa, M. D.
Ramírez-Bon, R.
Espinoza Beltrán, F. J.
Institución
Resumen
In this work, TiO 2-N powders were synthesized by high-energy ball milling, using commercial titanium dioxide (TiO 2) in the anatase phase and urea to introduce nitrogen into TiO 2 in order to enhance their photocatalytic properties in the visible spectral region. Several samples were prepared by milling a mixture of TiO 2-urea during 2, 4, 8, 12 and 24 h and characterized by spectroscopic and analytical techniques. X-ray diffraction (XRD) results showed the coexistence of anatase and high-pressure srilankite TiO 2 crystalline phases in the samples. Scanning electron microscopy (SEM) revealed that the grain size of the powder samples decreases to 200 nm at 24 h milling time. UV-Vis diffuse reflectance spectroscopic data showed a clear red-shift in the onset of light absorption from 387 to 469 nm as consequence of nitrogen doping in the samples. The photocatalytic activity of the TiO 2-N samples was evaluated by methylene blue degradation under visible light irradiation. It was found th