Preparation of flower-like Bi 2 WO 6 /ZnO heterojunction photocatalyst with improved photocatalytic performance
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Preparation of flower-like Bi2WO6/ZnO heterojunction photocatalyst with improved photocatalytic performance Xiangjie Jin1,* 1
and Haichao Liu1
North China University of Water Resources and Electric Power, Zhengzhou 450046, China
Received: 31 May 2020
ABSTRACT
Accepted: 4 September 2020
Flower-like hierarchical Bi2WO6/ZnO nanostructures have been successfully obtained through the hydrothermal method. The composite is characterized by XRD, UV–Vis, SEM, EDS and XPS. The synthesized flower-like Bi2WO6/ZnO heterojunction photocatalyst can effectively degrade rhodamine (RhB) and methylene blue (MB). The photocatalyst degradation efficiency of MB can reach 96%, and the degradation efficiency of RhB can reach 92%. Recycle experiments show that Bi2WO6/ZnO maintains good photocatalytic activity and stability after five cycles of use. Through various characterizations, the photocatalytic mechanism was well explained and proved.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction Semiconductor nanomaterials are considered to be the most important category of multifunctional materials due to their excellent properties and various potential application prospects, especially in the application and research of environmental treatment and solar energy conversion [1–3]. Photocatalysis is a kind of technology which involves many fields such as nanomaterials, catalytic chemistry and material science. Since it can utilize pollution-free and infinite solar energy to catalyze pollutants at room temperature and can be reused for many times, which has become an important means of sewage treatment [4, 5]. ZnO is an ideal photocatalyst material with high quantum efficiency and low preparation cost [6].
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https://doi.org/10.1007/s10854-020-04415-2
However, the ZnO is difficult to generate photogenerated electrons in the visible light [7]. This characteristic greatly restricts the application of ZnO. For improving the utilization rate of ZnO to sunlight, scientific researchers began to explore the possibility of ZnO composites in the field of photocatalysis. By combining with other materials, the defects of ZnO materials can be improved, which makes ZnO composites more widely used in the field of photocatalysis [8].The methods of composition include element doping and heterogeneous composition. At present, element doping research can be divided into two types according to the difference of doping elements, including doping of metal elements (such as Au [9], Ag [10], Mg [11], Cu [12]) and doping of nonmetal elements (C) [13], N [14], B [15]). VAIANO V [16] synthesized Cu-doped ZnO materials and
J Mater Sci: Mater Electron
Alshammari [17] synthesized C-doped ZnO materials by high temperature pyrolysis. At present, it is an effective modification method to combine different semiconductors to form heterogeneous structures. The heterogeneous structures can improve the separation efficiency of photogenerated electrons and photogenerated holes usin
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