A series of bismuth-oxychloride/bismuth-oxyiodide/graphene-oxide nanocomposites: Synthesis, characterization, and photcatalytic activity and mechanism

作者：Lee Yu Hsun; Dai Yong Ming; Fu Jing Ya; Chen Chiing Chang^*

来源：Molecular Catalysis, 2017, 432: 196-209.

DOI：10.1016/j.mcat.2017.01.002

• Bismuth oxychloride
• Bismuth oxyiodide
• Graphene oxide
• Composites
• Photocatalytic
• Crystal violet

This is the first report that a series of bismuth oxychloride/bismuth oxyiodide/graphene oxide (BiOmCln/BiOxIy/GO) nanocomposites with different GO contents are synthesized through a simple hydrothermal method and characterized using X-ray diffraction, transmission electron microscopy, scanning electron microscopy energy-dispersive spectroscopy, Fourier transform infrared, X-ray photoelectron spectroscopy, and diffuse reflectance spectroscopy. The BiOmCln/BiOxIy/GO composites exhibit excellent photocatalytic activities in the degradation of crystal violet (CV) and phenol under visible light irradiation. The order of rate constants appears BiOCl/Bi3O4Cl/BiOI/Bi7O9I3/GO > BiOCl/Bi12O17Cl2/BiOI/GO > BiOCl/Bi12O17Cl2/BiOI/GO > BiOCl/Bi3O4Cl/BiOI/Bi7O9I3/GO > Bi12O17Cl2/Bi5O7I/GO > Bi12O17Cl2/Bi5O7I/GO > Bi4O5I2 > Bi7O9I3 > BiOI > Bi5O7I > BiOCl > GO for photocatalytic degradation of CV. The photocatalytic activity of BiOCl/Bi3O4Cl/BiOI/Bi7O9I3/GO composites reaches a maximum rate constant of 0.422 h(-1), which is 2.3 times higher than that of BiOCl/Bi3O4Cl/BiOI/Bi7O9I3, 9 and 2 times higher than that of BiOI and Bi4O5I2, and 18 and 12 times higher than that of BiOCl and Bi3O4Cl. When being irradiated, it can produce two major active species, superoxide radical (O-2(center dot-)) and hydroxyl radical (center dot OH), and a minor active species, singlet oxygen (O-1(2)), for the CV degradation.

• 出版日期2017-5