Bi 2WO 6 photocatalytic films fabricated by layer-by-layer technique from Bi 2WO 6 nanoplates and its spectral selectivity
Abstract
Bi 2WO 6 multilayer films have been fabricated successfully by a layer-by-layer (LbL) technique from Bi 2WO 6 nanoplates, which show higher visible-light photoactivity ( λ>420 nm) than that of Bi 2WO 6 nanoplate powders and P25 TiO 2 films. The films were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and UV-visible absorption spectroscopy. Photocatalytic activities of the films were evaluated by the rhodamine B (RhB) decomposition under UV and visible-light irradiation. Thickness and photoactivity of the film can be modified easily by changing the deposition cycles. Bi 2WO 6 films have the spectral selectivity of the photocatalytic degradation of RhB. Under the wavelength greater than 300 nm, the RhB molecules tend to be transformed to rhodamine over Bi 2WO 6 films selectively. However, in the case of shorter wavelength ( λ=254 nm) light irradiation, the RhB molecules can be photodegraded completely.
- Publication:
-
Journal of Solid State Chemistry France
- Pub Date:
- April 2007
- DOI:
- 10.1016/j.jssc.2007.02.013
- Bibcode:
- 2007JSSCh.180.1456Z