Bismuth Tungstate Composite Photocatalyst Preparation by Solvothermal Method

Bismuth tungstate is a photocatalyst in the field of star products, due to its narrow band gap (about 2.7eV), in response to 400-460 nm of visible light, but due to the Bi₂WO₆ structure by WO6 eight surface layer and Bi₂O₂ layer composed of alternating layers of features, making it easy to form assembled by nanoplates of 3D structure, it can not only provide more sex sites for the photocatalytic reaction, but also have better recycling and recycling, thus showing potential application value in environmental purification.

Although Bi₂WO₆ is more capable of using solar energy than traditional photocatalyst TiO₂, but due to its intrinsic absorption threshold (460nm), the pure bismuth tungstate photocatalyst still has some bottlenecks that limit its practical application. One is that the absorption range of visible light is narrower, and the other is that the recombination rate of the photogenerated carrier is faster.

The construction of heterogeneous structures is one of the ways to effectively solve the above problems. Therefore, Zhang Guoying and other scholars have put forward the idea of improving Bi₂WO₆ by bismuth overdose. The Bi₂WO₆ heterogeneous photocatalyst with Bi(OH)₃ complex was prepared by a one-pot solvothermal method by utilizing the biodegradability of Bi source and using only one kind of bismuth source and making it excess.

Compared with the pure Bi₂WO₆ prepared by the measurement of Bi and W, the activity of the composite photocatalyst is significantly improved. The Bi(OH)₃ / Bi₂WO₆ composite photocatalysts showed high photocatalytic activity in the degradation of industrial dye wastewater, saccharin wastewater and papermaking wastewater, compared with other bismuth tungstate photocatalysts, such as titanium, silver and other elements, the technology has the advantages of simplicity, low cost, high performance and recyclability. It can effectively solve the bottleneck problem of Bi₂WO₆ photocatalyst in practical applications.

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