Formation of BiOI/g-C3N4 nanosheet composites with high visible-light-driven photocatalytic activity

doi:10.1016/S1872-2067(17)62927-9

Abstract

Abstract:

Constructing binary heterojunctions is an important strategy to improve the photocatalytic performance of graphitic carbon nitride (g-C₃N₄). In this paper, a novel g-C₃N₄ nanosheet-based composite was constructed via in situ growth of bismuth oxyiodide (BiOI) nanoplates on the surface of g-C₃N₄ nanosheets. The crystal phase, microstructure, optical absorption and textural properties of the synthesized photocatalysts were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), ultraviolet-visible (UV-vis) diffuse reflectance spectroscopy (DRS), and nitrogen adsorption-desorption isotherm measurements. The BiOI/g-C₃N₄ nanosheet composite showed high activity and recyclability for the photodegradation of the target pollutant rhodamine B (RhB). The conversion of RhB (20 mg L^-1) by the photocatalyst was nearly 100% after 50 min under visible-light irradiation. The high photoactivity of the BiOI/g-C₃N₄ nanosheet composite can be attributed to the enhanced visible-light absorption of the g-C₃N₄ nanosheets sensitized by BiOI nanoplates as well as the high charge separation efficiency obtained by the establishment of an internal electric field between the n-type g-C₃N₄ and p-type BiOI. Based on the characterization and experimental results, a double-transfer mechanism of the photoinduced electrons in the BiOI/g-C₃N₄ nanosheet composite was proposed to explain its activity. This work represents a new strategy to understand and realize the design and synthesis of g-C₃N₄ nanosheet-based heterojunctions that display highly efficient charge separation and transfer.

Key words: g-C₃N₄, BiOI, Nanosheet, Photodegradation, Double-transfer mechanism, Visible light

Hua An, Bo Lin, Chao Xue, Xiaoqing Yan, Yanzhu Dai, JinJia Wei, Guidong Yang. Formation of BiOI/g-C₃N₄ nanosheet composites with high visible-light-driven photocatalytic activity[J]. Chinese Journal of Catalysis, 2018, 39(4): 654-663.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(17)62927-9

https://www.cjcatal.com/EN/Y2018/V39/I4/654

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Formation of BiOI/g-C₃N₄ nanosheet composites with high visible-light-driven photocatalytic activity

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