Citation: Li Guo, Kailai Zhang, Xuanxuan Han, Qiang Zhao, Yuanyuan Zhang, Mian Qi, Danjun Wang, Feng Fu. 2D/2D type-II Cu₂ZnSnS₄/Bi₂WO₆ heterojunctions to promote visible-light-driven photo-Fenton catalytic activity[J]. Chinese Journal of Catalysis, ;2020, 41(3): 503-513. doi: S1872-2067(19)63524-2 shu

2D/2D type-II Cu₂ZnSnS₄/Bi₂WO₆ heterojunctions to promote visible-light-driven photo-Fenton catalytic activity

Shaanxi Key Laboratory of Chemical Reaction Engineering, College of Chemistry&Chemical Engineering, Yan'an University, Yan'an 716000, Shaanxi, China

Received Date: 6 August 2019
Revised Date: 23 September 2019

Fund Project: This work was supported by the National Natural Science Foundation of China (21663030, 21666039), the Open Project of State Key Laboratory of Organic-Inorganic Composites Beijing Key Laboratory, Beijing University of Chemical Technology (oic-201901009), the Project of Science & Technology Office of Shannxi Province (2018TSCXL-NY-02-01, 2013K11-08, 2013SZS20-P01), Industrial Key Project of Yan'an Science and Technology Bureau (2018KG-04), and the Project of Yan'an Science Graduate Innovation Project of Yan'an University (YCX201988).

In this work, a set of novel Cu₂ZnSnS₄/Bi₂WO₆ (CZTS/BWO) two-dimensional (2D)/two-dimensional (2D) type-II heterojunctions with different CZTS weight ratios (1%, 2%, and 5%) were successfully synthesized via a brief secondary solvothermal process. The successful formation of the heterojunctions was affirmed by characterization methods such as X-ray photoelectron spectroscopy and high-resolution transmission electron microscopy. The photocatalytic activity results showed that the prepared CZTS/BWO heterojunctions had excellent photocatalytic behaviors for organic degradation, especially when the mass fraction of CZTS with respect to BWO in the composite was 2%. Moreover, the addition of hydrogen peroxide (H₂O₂) could further improve the dye and antibiotic degradation efficiencies. The reinforced photocatalytic and photo-Fenton degradation performance were primarily attributable to the introduction of BWO, which afforded increased active sites, expanded the solar spectral response range, and accelerated the cycle of Cu(II)/Cu(I); after four cycling times, its catalytic activity did not decrease significantly. In addition, reasonable hypotheses of the photocatalytic and photo-Fenton catalytic mechanisms were formulated. This study is expected to provide a visual approach for designing a novel photo-Fenton catalyst to jointly utilize the photocatalytic and Fenton activities, which can be better applied to the purification of residual organics in wastewater.
- Cu₂ZnSnS₄,
- Bi₂WO₆,
- 2D/2D type-II heterojunction,
- Photo-Fenton,
- Photocatalysis
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通讯作者: 陈斌, bchen63@163.com

2D/2D type-II Cu₂ZnSnS₄/Bi₂WO₆ heterojunctions to promote visible-light-driven photo-Fenton catalytic activity