Abstract
Cu2O@SnS2 heterojunction photocatalysts with one-dimensional hierarchical nanostructure were prepared by the solvothermal method. The Cu2O@SnS2 hierarchical nanostructure is composed of Cu2O nanowire core as well as in situ grown ultra-thin SnS2 nanosheets on Cu2O nanowires. The hierarchical Cu2O@SnS2 composite shows higher catalytic activity, and the degradation ratio of MB reaches nearly 100% at 80 min. The first-order reaction kinetic constant of Cu2O@SnS2 is 0.045 min− 1, which is much higher than that of Cu2O (0.003 min− 1) and SnS2 (0.014 min− 1). The improvement in photocatalytic performance is mainly due to the formation of typical heterojunction between Cu2O and SnS2. Photo-induced electrons in the CB of Cu2O react with oxygen to form superoxide radicals (·O2−) with strong oxidation ability. At the same time, the photo-induced holes in the VB of SnS2 also have strong oxidation ability, and the two can synergistically induce the degradation of pollutants. In addition, SnS2 nanosheets not only provide a large number of reaction sites for photocatalytic degradation, but also facilitate the migration of photo-induced carrier to the surface. The unique hierarchical Cu2O@SnS2 microstructure can also promote multiple light scattering within the material to enhance light absorption. Thus, the one-dimensional hierarchical Cu2O@SnS2 is a promising new visible light catalyst, which has potential application prospect in environmental protection and wastewater treatment.
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The datasets generated and analyzed during this study are available from the first or corresponding author upon reasonable request.
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Acknowledgements
This study was supported by the Natural Science Foundation of Zhejiang Province (Grant Numbers LQ18E020003 and LY20F040005), The Fundamental Research Funds of Zhejiang Sci-Tech University (Grant Number 2019Q073), National Natural Science Foundation of China (Grant Numbers 51672249 and 11804300).
Funding
Funding was provided by the Natural Science Foundation of Zhejiang Province (Grant Numbers LQ18E020003, LY20F040005, LQ18A040005), The Fundamental Research Funds of Zhejiang Sci-Tech University (Grant Number 2019Q073), National Natural Science Foundation of China (Grant Numbers 51672249 and 11804300).
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All authors have participated in the research activities of this paper. XW, LC, HH, CS, QJ, LX and CC performed material preparation, data collection and analysis. The first draft of the manuscript was written by XW, and all authors have commented on previous editions. PW, PL and CC revised the English grammar of the original manuscript. All authors have given approval to the final version of the manuscript.
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Wu, X., Chen, L., Hu, H. et al. One-dimensional hierarchical Cu2O@SnS2 heterojunction with enhanced visible-light-driven photocatalytic activities. J Mater Sci: Mater Electron 34, 112 (2023). https://doi.org/10.1007/s10854-022-09407-y
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DOI: https://doi.org/10.1007/s10854-022-09407-y