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

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

Hua An ^a, ,
Bo Lin ^a ,
Chao Xue ^a ,
Xiaoqing Yan ^a ,
Yanzhu Dai ^b ,
JinJia Wei ^a ,
Guidong Yang ^a

a XJTU-Oxford International Joint Laboratory for Catalysis, School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China;
b Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education, Center for Dielectric Research, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China

Received Date: 30 October 2017
Revised Date: 9 December 2017

Fund Project: This work was supported by the Natural Science Basic Research Plan in Shaanxi Province of China (2017JZ001), the National Natural Science Foundation of China (21303130), State Key Laboratory of Heavy Oil Processing (SKLOP201602001), and the Fundamental Research Funds for the Central Universities (cxtd2017004). Thanks for the technical support from International Center for Dielectric Research (ICDR), Xi'an Jiaotong University, Xi'an, China

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.
- g-C₃N₄,
- BiOI,
- Nanosheet,
- Photodegradation,
- Double-transfer mechanism,
- Visible light
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Formation of BiOI/g-C3N4 nanosheet composites with high visible-light-driven photocatalytic activity

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通讯作者: 陈斌, bchen63@163.com

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