Bi<sub>2</sub>WO<sub>6</sub>/石墨烯复合材料的制备与光催化应用研究进展

doi:10.11896/cldb.19020029

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Abstract Photocatalytic solar energy conversion has been regarded as an effective approach to address the increasing energy shortage and environmental pollution issues. Therefore, it is imperative to explore novel photocatalysts owning preferable photocatalytic activity and excellent cyclic performance for the development of photocatalytic technologies. As one of the simplest Aurivillius type oxides, Bi₂WO₆ is an important n-type semiconductor material, which exhibits excellent visible-light response photocatalytic performance and has been highly desired for organic pollutants degradation under solar irradiation. However, bare Bi₂WO₆ has drawbacks of high recombination efficiency of photogenerated electron-hole pairs and limited visible light absorption ability, which hinder the enhancement of photocatalytic performance. To solve these problems, it is an effective solution to couple graphene, carbon quantum dots, TiO₂ and other materials with Bi₂WO₆.
　　Graphene has recently attracted tremendous attention owing to its fascinating electrical and chemical properties. Graphene is a new type of two-dimensional nanomaterials with hexagonal honeycomb lattice composed of carbon atoms with sp² hybrid orbitals, which has excellent electrical and optical properties. The main performance improvements after Bi₂WO₆ coupled with graphene are as follows: i. The excellent electronic conductivity of graphene will promote the charge transfer through its conjugated structure, inhibiting the recombination of the photogenerated electron-hole pairs. ii. Based on the fact that graphene has a large π-conjugated bonding system and a two-dimensional plane structure, small molecules or high molecular pollutants with conjugated bonding systems can easily be adsorbed on the surface of graphene through π-π interaction, which is beneficial to the catalytic reaction. iii. The excellent optical properties of graphene can enhance the visible-light absorption of the composites.
　　At present, hydrothermal, solvothermal and ultrasonic chemical synthesis methods are the most common methods for preparing Bi₂WO₆/graphene composites. Hydrothermal method is both economical and practical, which has been widely used. Solvothermal method utilize certain properties of non-aqueous medium to implement many reactions which cannot be carried out in aqueous solution. Ultrasonic chemical synthesis method attracts widely attention in recent years because of its unique acoustic cavitation effect.
　　In this paper, the preparation method of Bi₂WO₆/graphene composites is classified into four categories: hydrothermal method, solvothermal method, ultrasonic chemical synthesis and other synthetic methods. The photocatalytic enhancement mechanism of composites are briefly described. The specific application of composites in photocatalysis are summarized and the preparation and application of Bi₂WO₆/graphene composites are prospected.

Key words： Bi₂WO₆ graphene composite photocatalysis energy shortage environmental pollution

Published: 16 January 2020

CLC number:

TB33

About author:: Jing Renreceived her B.E. degree in applied chemistry from Qilu University of Technology in 2018. She is currently pursuing her master's degree at School of Chemistry and Pharmaceutical Engineering, Qilu University of Technology (Shandong Academy of Sciences) under the supervision of Prof. Guowei Zhou. Her research focuses on nanocomposite photocatalytic mate-rial.;Guowei Zhoureceived his B.S., M.S., and Ph.D. degrees in Chemistry at Shandong University (1986, 1989, and 2001). He carried out postdoctoral research in Prof. Young Soo Kang’s group at Pukyong National University (Korea, 2002—2003) and in Prof. Shihe Yang’s group at The Hong Kong University of Science and Technology (2005—2006). He is currently a Professor at Qilu University of Technology. His research interests include the ordered mesoporous materials for catalysis, and energy conversion and storage.

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	REN Jing
	LI Xiuyan
	XIN Wangpeng
	ZHOU Guowei

Cite this article:

REN Jing,LI Xiuyan,XIN Wangpeng, et al. Progress on the Preparation and Application in Photocatalysis of Bi₂WO₆/Graphene Composites[J]. Materials Reports, 2020, 34(5): 5001-5007.

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http://www.mater-rep.com/EN/10.11896/cldb.19020029 OR http://www.mater-rep.com/EN/Y2020/V34/I5/5001

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