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

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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Correspondence to Liang Wei.

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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 (2021). https://doi.org/10.1007/s10854-021-05333-7

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