新型光催化剂钨酸锌的制备及性能改性研究进展

doi:10.11896/cldb.18040056

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Abstract Nowadays, the global energy crisis and environmental pollution are becoming more and more serious, which greatly endangers human health and restricts the development of society. Aiming at the sustainable development of human beings, it is urgent to solve environmental problems by developing and applying new clean energy with less pollution. In recent years, photocatalytic oxidation technology has become an efficient and ideal environmental pollution control technology and aroused numerous interests at home and abroad, due to its capacity of deep reaction at room temperature and utilizing solar energy as light source to directly driven reaction. Accordingly, the development and application of highly efficient photocatalysts has become a research hot spot in the field of the environment.
In the past decades, titanium dioxide (TiO₂) has been a widely studied semiconductor photocatalyst, thanks to its nontoxicity, low cost, and favorable stability. Nevertheless, its narrow optical frequency response range and low solar energy utilization rate constitute the bottlenecks for its practical application. Therefore, great efforts have been put into the development of non-TiO₂ photocatalytic materials with different structures by various preparation approaches. These photocatalytic materials include simple oxide, composite metal oxide, perovskite-type composite oxide and series compound. Among of them, zinc tungstate (ZnWO₄) is a novel non-TiO₂ semiconductor photocatalyst with great significance, which features unique physicochemical properties of wide band gap, high excitation energy, strong ultraviolet light response, and satisfactory catalytic activity. Hence, ZnWO₄ has been considered as one of the most promising metal tungstate photocatalysts. The synthesis and properties study of ZnWO₄ nano-powders pave the way for a novel approach for photocatalytic degradation of organic pollutants, exhibiting extremely important research value and is also the focus of new photocatalyst research in recent years.
Generally, the photocatalytic activity of ZnWO₄ semiconductor photocatalyst are greatly affected by the crystal morphology, size, composition, and the dopant. Currently, ZnWO₄ nano-photocatalysts with various morphologies, sizes and crystallinities have been synthesized by diverse preparation methods, including solid phase reaction, hydrothermal method, solvothermal method, sol-gel method, chemical precipitation method, micro-emulsion method, and template method. The relationships among preparation process, crystal characteristics (namely crystal morphology, size, composition, and the degree of crystallization), and photocatalytic properties have been studied. However, the photoresponse range of ZnWO₄ synthesized by these methods is still narrow, and only the ultraviolet with high energy can be absorbed in the entire solar spectrum, resulting in a low optical quantum yield. For the sake of further broadening the photo response range of ZnWO₄, therefore, a variety of improvement approaches of photocatalytic activity, including doping modification and material compounding, have been employed to broaden the photo response range of ZnWO₄, realize its strong visible light responsivity, and further enhance the photocatalytic properties of ZnWO₄.
Consequently, it is of great scientific significance and practical value in promoting the research and application of tungstate photocatalytic materials to dig out the impact of preparation processes and properties modification approaches on the crystal morphology, size and composition of ZnWO₄, and the effect of these characteristics on the photocatalytic activity. Based on the analysis of the ZnWO₄ crystal structure characteristics, the research progress of ZnWO₄ photocatalyst in recent years is summarized from the aspects of preparation method, doping modification and material compounding, and the interrelations among structure, morphology and properties are discussed as well. Meanwhile, the future development prospects of ZnWO₄ photocatalyst is pointed out, and the main measures for optimizing the photocatalytic properties of ZnWO₄ are proposed.

Key words： zinc tungstate semiconductor photocatalysis nanomaterial doping modification

Published: 10 May 2019

CLC number:

TM281

Fund:This work was financially supported by the Open Project of State Key Laboratory of Solidification Technology (SKLSP201624), the National Natural Science Foundation of China (51602252), and the Sub-topic of National Key Basic Research and Development Project (2017YFC0703204).

About author:: Shan Hou received her B.S. degree from Shaanxi University of Technology in 2015. She is currently pursuing her M.S. degree at the College of Materials Science and Engineering in Xi’an University of Science and Technology under the supervision of Prof. Xiangchun Liu. She is mainly engaged in the research on the synthesising of novel functional nano-semiconductor materials for photocatalytic applications.Xiangchun Liu received his B.S. degree from China University of Geosciences in 1998, and his M.S. and Ph.D. degrees from Northwestern Polytechnical University in 2005 and 2007, respectively. Now he is a full professor and academic leader of materials science at the College of Materials Science and Engineering, Xi’an University of Science and Technology. His research interests mainly focus on the synthesis of novel functional nanostructured materials for photocatalytic applications.

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HOU Shan,LIU Xiangchun. Preparation and Properties Modification of Novel Photocatalyst Zinc Tungstate: a Review[J]. Materials Reports, 2019, 33(9): 1541-1549.

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http://www.mater-rep.com/EN/10.11896/cldb.18040056 OR http://www.mater-rep.com/EN/Y2019/V33/I9/1541

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