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2D g-C3N4/BiOBr heterojunctions with enhanced visible light photocatalytic activity

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Abstract

The two-dimensional (2D) layered photocatalysts are promising to improve the separation efficiency of photogenerated electron-hole pairs. Herein, 2D graphitic carbon nitride (g-C3N4)/BiOBr heterojunctions were successfully prepared via a facile solvothermal method. The micromorphology, structure, and chemical composition/states were characterized. The visible light–induced photocatalytic properties were estimated by the degradation of rhodamine B (RhB), photocurrent responses, Nyquist spectra, and Mott-Schottky measurement. Comparing with pure g-C3N4 and BiOBr, 2D g-C3N4/BiOBr heterojunctions exhibit the enhanced visible light photodegradation. After coupling between (001) crystal planes of BiOBr with (002) planes of g-C3N4, 2D g-C3N4/BiOBr heterojunctions have the large and intimate contact surface allowing fast interfacial charge transfer rate. It is explored that photoinduced superoxide radicals (·O2) and holes (h+) actively participate in the photodegradation, while the contribution of hydroxyl (·OH) radicals is negligible.

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Funding

This research was funded by the National Natural Science Foundation of China (51303022) and the Shanghai Municipal Natural Science Foundation (12ZR1400400), the Fundamental Research Funds for the Central Universities (2232015D3-17, 15D110558), and Industry-University-Institute Project (Booster Plan) of Shanghai Municipal Education Commission (15cxy55).

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Correspondence to Yaping Zhao.

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Zhou, M., Huang, W., Zhao, Y. et al. 2D g-C3N4/BiOBr heterojunctions with enhanced visible light photocatalytic activity. J Nanopart Res 22, 13 (2020). https://doi.org/10.1007/s11051-019-4739-3

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  • DOI: https://doi.org/10.1007/s11051-019-4739-3

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