Publication Date:
2011-09-28
Description:
Anatase TiO 2 -modified flower-like Bi 2 WO 6 nanostructures were prepared by a simple hydrothermal reaction followed by layer-by-layer deposition and calcination. The photocatalytic activity was evaluated using Brilliant Red X3B, an anionic azo dye, as the target organic pollutant under UV-Vis light irradiation. The experiment results showed that the photocatalytic activity of the hybrid increases first and then decreases with increasing loading amount of TiO 2 . The hybrid coated with four layers of TiO 2 (containing 20 wt-% TiO 2 ) showed the highest photocatalytic activity, which is 10.45 and 3.20 times higher than that of pure Bi 2 WO 6 and TiO 2 , respectively. The improved photocatalytic performance of TiO 2 -modified Bi 2 WO 6 nanostructures could be ascribed to the improved light-harvesting ability, efficient photo-generated electron-hole separation, and enhanced adsorption of the dye. This work may shed light on the design of complex architectures and the exploitation of their potential applications. TiO 2 -modified flower-like Bi 2 WO 6 nanostructures were prepared by a simple method. The hybrid coated with four layers of TiO 2 shows the highest photocatalytic activity due to improved light-harvesting ability, efficient separation of photo-generated electron-hole pairs, and enhanced adsorption of the dye.
Print ISSN:
0930-7516
Electronic ISSN:
1521-4125
Topics:
Chemistry and Pharmacology
,
Process Engineering, Biotechnology, Nutrition Technology
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