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Fabrication and visible-light photocatalytic performance of two-dimensional ZnO/Bi3.9Zn0.4V1.7O10.5 nanoscale heterostructures
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Huzhou University

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National Natural Science Foundation of China (21607041),Science and Technology Planning Project of Zhejiang Province, China (2017C33240) and Undergraduate Student’s Research Project on Training Innovation and Enterprise, Qiuzhen School of Huzhou Teachers College (163).

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    Abstract:

    Surface engineering is an effective means to improve photocatalytic activity of semiconductors. In this work, two-dimensional (2D) ZnO/Bi3.9Zn0.4V1.7O10.5 nanosheets were successfully prepared using Zn5(CO3)2(OH)6 nanosheets as substrate to anchor BiVO4 followed by calcination. As-prepared samples were characterized by X-ray diffraction and transmission electron microscopy with elemental mapping attachment. Results show that with the increasing Zn/Bi molar ratio, the surface composition of ZnO porous nanosheets evolves into Bi3.9Zn0.4V1.7O10.5 step by step. When the Zn/Bi molar ratio is above 1:0.02, additional BiVO4 begins to form and grow into particles in the Bi3.9Zn0.4V1.7O10.5 region. Diffuse reflectance spectra of as-prepared samples reveal that nanoscale heterostructures harvest visible light of 400 ~ 600 nm dependent on the varying Zn/Bi molar ratio. The experiment for photocatalytic degradation of rhodamine B under visible light (λ ≥ 420 nm) illumination shows that this 2D heterostructure with the Zn/Bi molar ratio of 1:0.0133 performs the best photocatalytic activity in spite of no remarkable visible-light absorption. Photoluminescence and photoelectrochemical tests indicate that the enhancement in catalytic activity is attributable to an effective separation and transfer of photoinduced carriers caused by the ZnO/Bi3.9Zn0.4V1.7O10.5 heterostucture. This 2D surface heterogenization can promote the photocatalytic process, being applicable to a wide range of 2D nanostructures.

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[Tingjie Mao, Shengbing Ye, Qingfeng Luo, Yangguang Chen, Xutao Fang, Te Hu, Yanhua Tong. Fabrication and visible-light photocatalytic performance of two-dimensional ZnO/Bi3.9Zn0.4V1.7O10.5 nanoscale heterostructures[J]. Rare Metal Materials and Engineering,2020,49(4):1110~1118.]
DOI:10.12442/j. issn.1002-185X. SG20190074

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History
  • Received:May 05,2019
  • Revised:August 28,2019
  • Adopted:September 06,2019
  • Online: May 07,2020
  • Published: