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One-step synthesis of oxygen vacancy-rich α-Bi2O3-Bi4O7-BiO2 − x heterojunctions for photocatalytic degradation of organic pollutants

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Abstract

In order to make full use of sunlight and broaden the response spectral range of photocatalysts, herein, we prepared α-Bi2O3-Bi4O7-BiO2 − x composite photocatalysts with near-infrared response by a one-step hydrothermal method for the first time using Bi(NO3)3·5H2O and NaBiO3·2H2O as raw materials. The results showed that the α-Bi2O3-Bi4O7-BiO2 − x composite photocatalyst achieved 99.5% removal efficiency of rhodamine B (RhB) within 180 min under visible light irradiation, which was much higher than that of binary materials (17.8% for Bi4O7-BiO2 − x, 79.3% for α-Bi2O3-Bi4O7, and 38.4% for α-Bi2O3-BiO2 − x), single compounds (α-Bi2O3 18.6%, Bi4O7 63.4%, and BiO2 − x 13.6%), the reaction kinetic constants were about 18, 3, and 24 times higher than those of α-Bi2O3, Bi4O7, and BiO2 − x. The degradation rates of α-Bi2O3-Bi4O7-BiO2 − x for RhB, TC-HCl, OTC-HCl, ketoprofen, SMZ, and 2,4-DCP within 180 min were 99.5%, 100%, 100%, 81.1%, 90.4%, and 87.1%. Meanwhile, α-Bi2O3-Bi4O7-BiO2 − x still showed efficient removal of RhB in river water, lake water, and sea water, and showed higher activity under solar irradiation. Additionally, experimental characterization demonstrated that the enhanced photocatalytic performance was due to oxygen vacancies’ effective participation in electron transport, which made it easier to separate electron–hole pairs. Due to the narrow band gap of BiO2 − x, α-Bi2O3-Bi4O7-BiO2 − x displayed the removal performance of RhB under near-infrared light irradiation. This research is conducive to resulting in useful applications for photocatalysts in various settings including natural waterways.

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The data that support the findings of this study are available on request from the corresponding author. The data are not publicly available due to privacy or ethical restrictions.

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Acknowledgements

This research was supported by Guangxi Natural Science Foundation under Grant No. 2021GXNSFAA220003.

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Authors and Affiliations

  1. School of Resources, Environment and Materials, Guangxi University, 530004, Nanning, People’s Republic of China

    Juncheng Han, Ye Lei, Xiyuan Dong, Menghan Pang, Donghuan Meng, Jianrong Qiu, Qingge Feng & Dongbo Wang

  2. Guangxi Universities Key Laboratory of Environmental Protection, Guangxi University, 530004, Nanning, People’s Republic of China

    Qingge Feng & Dongbo Wang

  3. Solid Waste and Chemical Environmental Management Center of GuangXi Zhuang Autonomous Region, Nanning, People’s Republic of China

    Han Wei

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  1. Juncheng Han
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Contributions

JH: Investigation, Methodology, Writing—original draft. YL: Investigation. XD: Writing—review & editing, Investigation. MP: Writing—review & editing. DM: Investigation. JQ: Writing—review & editing. HW: Investigation, Resources. QF: Resources, Supervision. DW: Conceptualization, Writing—original draft.

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Han, J., Lei, Y., Dong, X. et al. One-step synthesis of oxygen vacancy-rich α-Bi2O3-Bi4O7-BiO2 − x heterojunctions for photocatalytic degradation of organic pollutants. J Mater Sci: Mater Electron 34, 877 (2023). https://doi.org/10.1007/s10854-023-10291-3

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