Citation: Junxiu Wang, Zhenzong Zhang, Xi Wang, Yi Shen, Yongfu Guo, Po Keung Wong, Renbi Bai. Synthesis of novel p-n heterojunction m-Bi₂O₄/BiOCl nanocomposite with excellent photocatalytic activity through ion-etching method[J]. Chinese Journal of Catalysis, ;2018, 39(11): 1792-1803. doi: 10.1016/S1872-2067(18)63142-0 shu

Synthesis of novel p-n heterojunction m-Bi₂O₄/BiOCl nanocomposite with excellent photocatalytic activity through ion-etching method

a Center for Separation and Purification Materials & Technologies, Suzhou University of Science and Technology, Suzhou 215009, Jiangsu, China;
b School of Life Science, The Chinese University of Hong Kong, Shatin, Hong Kong, China

Received Date: 23 May 2018
Revised Date: 20 July 2018

Fund Project: This work was supported by the National Natural Science Foundation of China (51578354), Suzhou Science and Technology Bureau (SS201667), Six Talent Peaks Program (2016-JNHB-067), and Qing Lan Project of Jiangsu Province.

A novel p-n heterostructure photocatalyst m-Bi₂O₄/BiOCl was successfully synthetized through a facile ion-etching method. Via adjusting the added volume of HCl solution, a series of different ratios of composite photocatalysts were obtained. The as-prepared samples of physical, chemical and optical characteristics were examined by X-ray diffraction, scanning electron microscope, transmission electron microscope, energy dispersive X-ray spectroscopy, selected-area electron diffraction, Fourier transform infrared absorption, Raman microscope, N₂ adsorption-desorption, X-ray photoelectron spectroscopy and UV-vis spectrum technologies. The photocatalysts showed high degradation rate and complete mineralization ability for methyl orange and tetracycline solution under visible light. The reaction rate constant of m-Bi₂O₄/BiOCl for methyl orange was 52.28 times higher than that of BiOCl. The characterization presented a good stability of materials. Furthermore, the photocurrent response test certified that the heterostructure effectively accelerated the separation and migration of photo-generated carries. The scavenger experiments evidenced that hole (h⁺) and superoxide radical (·O₂^-) were the primary active radicals. A possible photocatalytic mechanism was proposed. This work provided an alternative photocatalyst applied to water environmental remediation.
- Dibismuth tetroxide,
- Photocatalysis,
- Methylene orange,
- Tetracycline,
- Degradation mechanism
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通讯作者: 陈斌, bchen63@163.com

Synthesis of novel p-n heterojunction m-Bi₂O₄/BiOCl nanocomposite with excellent photocatalytic activity through ion-etching method