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Synthesis and photocatalytic mechanism of visible-light-driven AgBr/g-C3N4 composite

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Abstract

g-C3N4 is a well-known visible-light-active photocatalyst for the degradation of environmental pollutants. However, its photocatalytic activity is restricted by the small specific surface area and the e−/h+ recombination rate. In order to improve the photocatalytic performance of g-C3N4, AgBr/g-C3N4 composite photocatalyst has been designed. The as-prepared AgBr/g-C3N4 was characterized by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), transmission electron microscope (TEM), Brunauer–Emmett–Teller (BET), X-ray photoelectron spectroscopy (XPS), ultraviolet–visible spectrophotometer (UV–Vis) and room temperature photoluminescence (PL). The photocatalytic activity was evaluated by the photodegradation of methyl orange (MO) under simulated visible-light irradiation. The results show that g-C3N4 is porous structure with a large specific surface area of loading AgBr nanoparticles greatly improves the photocatalytic activity. The AgBr content is optimized to 25 wt%, where the degradation rate of MO can reach 90% after 30 min. The enhancement in photocatalytic performances is mainly attributed to the effective production and transfer of e−/h+ for AgBr can absorb the visible light. Moreover, ·O2− is demonstrated to be the dominant radical for the photocatalytic degradation of MO.

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Acknowledgement

This work was supported by the National Natural Science Foundation of China (21862004), Natural Science Foundation of Guangxi Province (2018GXNSFAA281230, 2017GXNSFBA198059), Middle-aged and Young Teachers' Basic Ability Promotion Project of Guangxi (2017KY0407) and BAGUI Scholar Program of Guangxi Province of China. The financial support was gratefully appreciated.

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Authors and Affiliations

  1. Guangxi Key Laboratory of Natural Polymer Chemistry and Physics, Nanning Normal University, Nanning, 530001, People’s Republic of China

    Jing Yang, Xianqian Zhang, Jieqing Long, Chuanfang Xie, Liang Wei & Xiande Yang

  2. Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Material Science and Chemistry, China University of Geosciences, 388 Lumo Road, Wuhan, 430074, People’s Republic of China

    Yongqian Wang

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  1. Jing Yang
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Yang, J., Zhang, X., Long, J. et al. Synthesis and photocatalytic mechanism of visible-light-driven AgBr/g-C3N4 composite. J Mater Sci: Mater Electron 32, 6158–6167 (2021). https://doi.org/10.1007/s10854-021-05333-7

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