TiO2-Modified Flower-Like Bi2WO6 Nanostructures with Enhanced UV-Vis Photocatalytic Activity

Anatase TiO2‐modified flower‐like Bi2WO6 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 irr...

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Bibliographic Details
Published in:Chemical engineering & technology 2011-10, Vol.34 (10), p.1630-1634
Main Authors: Zheng, Y., Lv, K. L., Li, X. F., Deng, K. J., Sun, J., Chen, L. Q., Cui, L. Z., Du, D. Y.
Format: Article
Language:English
Subjects:
Adsorption
Applied sciences
Bismuth tungstate
Catalysis
Catalytic reactions
Chemical engineering
Chemistry
Exact sciences and technology
General and physical chemistry
Nanocomposites
Photocatalytic activity
Semiconductor
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Titanium dioxide
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Summary:Anatase TiO2‐modified flower‐like Bi2WO6 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 TiO2. The hybrid coated with four layers of TiO2 (containing 20 wt‐% TiO2) showed the highest photocatalytic activity, which is 10.45 and 3.20 times higher than that of pure Bi2WO6 and TiO2, respectively. The improved photocatalytic performance of TiO2‐modified Bi2WO6 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. TiO2‐modified flower‐like Bi2WO6 nanostructures were prepared by a simple method. The hybrid coated with four layers of TiO2 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.
ISSN:0930-7516
1521-4125
DOI:10.1002/ceat.201100228