一步溶剂热法合成Bi<sub>2</sub>S<sub>3</sub>/BiOBr多级异质结及其增强可见光光催化去除RhB的研究

doi:10.11896/cldb.21030140

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Abstract In recent years, with the rapid development of industry, the problem of environmental pollution has become increasingly aggravated. Photocatalysis, as an energy-saving and environment-friendly technology with broad application prospects, has become a research hotspot in the field of environmental pollution treatment. In the beginning, the photocatalysts were mainly studied on TiO₂, but the activity of TiO₂ can only be excited under UV illumination, so numerous visible light excitable photocatalysts were gradually developed at home and abroad. Among them, bismuth bromide oxide (BiOBr) has been regarded as an innovative photocatalyst due to its unique optical properties and special electronic structure. However, the short wavelength range of visible light absorption of pure BiOBr is the bottleneck of its practical application. Nowadays, coupling with other semiconductors possessing excellent visible light absorption capacity has been considered an effective method to improve the photocatalytic performance of BiOBr phototalysts. In this study, an efficient binary three-dimensional spherical Bi₂S₃/BiOBr hierarchical heterostructure photocatalyst composed of lamellar BiOBr and rod-like Bi₂S₃ was constructed via a one-step solvothermal route. The obtained samples with different Bi₂S₃ contents were characterized by X-ray powder diffraction, scanning electron microscopy, high-resolution transmission electron microscopy and X-ray photoelectron spectroscopy. The structural analysis showed that the nano-flower-like Bi₂S₃/BiOBr three-dimensional spheres were successfully prepared and a tight interfacial connection was formed between the two components. The photocatalytic tests revealed that the catalytic properties of the composites were highly dependent on the Bi₂S₃ content. Moreover, the 12.5%-Bi₂S₃/BiOBr composite exhibited the maximum activity for RhB degradation under visible light illumination, which was 4.2 times and 39.6 times higher than that of the BiOBr and Bi₂S₃ components, respectively. The mechanism of enhanced photocatalytic activity was proposed based on photoluminescence analysis, photocurrent measurements, electrochemical impedance and UV diffuse reflectance spectroscopy. The enhanced photocatalytic performance of the Bi₂S₃/BiOBr composites was mainly attributed to the formation of an effective heterojunction structure between the components, which led to an increase in carrier separation efficiency and an expansion of the visible light absorption range. The trapping experiments of active species showed that the degradation of RhB was mainly from the oxidation of cavities, followed by the action of superoxide radicals. The formation of superoxide radicals was found to be related to dye sensitization by energy band calculations and experimental analysis. The reusability test study showed that the 12.5%-Bi₂S₃/BiOBr samples still showed good stability and reusability after multiple cycles of degradation. Therefore, RhB removal by Bi₂S₃/BiOBr indicates the potential of the as-prepared composite to degrade other types of organic compounds for wastewater purification and environmental remediation applications.

Key words： Bi₂S₃/BiOBr heterojunction Rhodamine B visible light photocatalysts

Published: Online: 2023-01-03

CLC number:

X703

Fund:National Natural Science Foundation of China (51402030), Natural Science Foundation of the Chongqing Science and Technology Commission (cstc2017jcyjBX0028), and Science and Technology Research Program of Chongqing Municipal Education Commission (KJZD-K201800703).

About author: Yi Liu, is a graduate student of the School of River and Ocean Engineering, Chongqing Jiaotong University. Since entering the school in 2019, he had participated in national, provincial and ministerial projects hosted by his supervisor. His research work mainly focuses on the application of functional composite materials/nanomaterial in environmental remediation and energy and the fundamental theory & the environmental effects of graphene derivatives.
Xiaoya Yuan, received his Ph.D. and M.S. degrees from Nankai University and Hubei University, respectively. Now he is a professor and postgraduate tutor of Chongqing Jiaotong University. His main research directions include environmental catalytic materials, energy storage materials, concrete admixtures, functional building materials, etc. In the past five years, he has presided over more than 10 national, provincial and ministerial projects; published more than 60 academic papers in high-level magazines at home and abroad, including SCI/EI indexing more than 40 articles.

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Cite this article:

LIU Yi,FENG Zijuan,JIA Wen, et al. One-step Solvothermal Synthesis of Bi₂S₃/BiOBr Hierarchical Heterojunction for Enhanced Visible-light Photocatalytic RhB Removal[J]. Materials Reports, 2022, 36(24): 21030140-8.

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http://www.mater-rep.com/EN/10.11896/cldb.21030140 OR http://www.mater-rep.com/EN/Y2022/V36/I24/21030140

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