Synthesis of Bi 2 WO 6 /TiO 2 flake nano-heterostructure photocatalyst and its photocatalytic performance under visible
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Synthesis of Bi2WO6/TiO2 flake nano-heterostructure photocatalyst and its photocatalytic performance under visible light irradiation Meina Zhang1,* 1
Jilin Vocational College of Industry and College, Jilin 132013, China
Received: 26 April 2020
ABSTRACT
Accepted: 22 September 2020
Bi2WO6/TiO2 heterostructure was obtained by a simple way. The crystal form and elemental composition of Bi2WO6/TiO2 photocatalyst were characterized by XRD, UV-vis, SEM, TEM, EDS as well as XPS. The synthesized heterojunction has a wide absorption in the visible light area, which provides a good basis for the photocatalytic degradation of organic dye applications. The photocatalytic performance and pollutant degradation efficiency of Bi2WO6/TiO2 photocatalyst were studied. The photocatalytic degradation activity of Bi2WO6/TiO2 is stronger than Bi2WO6 and TiO2. The degradation of Bi2WO6/TiO2 photocatalyst to Methylene blue (MB) was investigated under visible light irradiation. According to the energy band position, the result of photoluminescence (PL) and the capture experiment of active species, a mechanism to significantly improve the photocatalytic performance is proposed. In addition, the photocatalyst not only has good photocatalytic performance but also has good stability.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction In order to effectively use solar energy for practical applications, researchers have been developing photocatalysts for decades [1–3]. In recent years, TiO2 is widely used in the field of water purification, especially with great success in the degradation of organic pollutants [4–6]. However, due to the wide band gap of TiO2 and its ability to separate photogenerated electron-hole pairs, its practical application is limited [7–9]. Therefore, the research of modifying TiO2 to improve its photocatalytic ability in visible light area
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https://doi.org/10.1007/s10854-020-04534-w
has become a hot spot in the field of photocatalysis. The most popular way is that combining with other semiconductors to extend the spectral response range [10–12]. Bi2WO6, a narrow band gap semiconductor, is considered to be a preferred photocatalyst because of its excellent intrinsic physical and chemical characteristics, non-toxicity and chemical stability [13]. Recently, Bi2WO6 which can catalytically degrade dyes under visible light is widely used [14–16]. Compared with single semiconductor photocatalysts, semiconductor heterojunctions with proper band gap
J Mater Sci: Mater Electron
and band orientation of semiconductors have been extensively studied to inhibit the recombination of photogenerated charges. For instance, several studies have shown that the layered Bi2WO6/TiO2 structure exhibits highly superior photocatalytic activity [17–19]. However, the photocatalytic mechanism in these studies has not been studied in detail. In this paper, Bi2WO6/TiO2 nanocomposites were prepared by a simple way. The prepared Bi2WO6/ TiO2 has good visible
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