期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 313, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.micromeso.2020.110830
关键词
Hydrothermal synthesis; Bi2WO6; Concentration controlling; Photocatalysis; Tetracycline
类别
资金
- National Natural Science Foundation of China [22078071, 21777034]
- Natural Science Foundation of Guangdong Province [2020A1515010344]
- Maoming Science and Technology Project [mmkj2020032]
- Science and Technology Innovation Project of Guangdong Province College Students [201811656046, 201811656019]
- Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme (2019)
- Guangdong Basic and Applied Basic Research Foundation [2019A1515011249]
- Key Research Project of Natural Science of Guangdong Provincial Department of Education [2019KZDXM010]
- program for Innovative Research Team of Guangdong University of Petrochemical Technology
This study focused on the synthesis of 3-D hierarchical micro/nano-structures (3-D HMNSs) Bi2WO6 photocatalysts by hydrothermal method and revealed their excellent visible-light photocatalytic activity. Experimental results and analysis demonstrated the photocatalytic degradation mechanism and the advantages of Bi2WO6-4# sample in promoting the separation of electron-hole pair for high photocatalytic activity.
As one of the simplest aurivillius layered materials, Bi2WO6 is a promising photocatalyst with a wide range of applications. The construction of 3-D hierarchical micro/nano-structures (3-D HMNSs) can be considered as an excellent strategy to improve the photocatalytic activity. In this paper, a series of porous Bi2WO6 photocatalysts with 3-D HMNSs were synthesized by hydrothermal method via adjusting the concentration of reactants. All kinds of characterization methods (XRD, SEM, TEM, BET, UV-Vis, etc.) were used to characterize the as synthesized samples. Taking tetracycline as a model pollutant, the photocatalytic properties of these Bi2WO6 photocatalysts were investigated, and the mechanism of its photocatalytic degradation was also proposed. The Bi2WO6-4# sample showed the highest visible-light photocatalytic activity, with tetracycline removal rate of 99.9% in 1 h irradiation and a kinetic reaction rate constant of 0.06071 min(-1). The catalytic mechanism analysis shows that the active radicals of center dot OH and center dot O-2(-) produced by the photoelectron hole have strong oxidizing property, which can quickly decompose tetracycline. Bi2WO6-4# with oriented arrangement of nanocrystals and increased Eg have the advantage of promoting the separation of electron-hole pair, accounting for the high photocatalytic activity.
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