Novel visible-light-driven AgX/graphite-like C3N4 (X = Br, I) hybrid materials with synergistic photocatalytic activity

Authors: Hui Xu, Jia Yan, Yuanguo Xu, Yanhua Song, Huaming Li, Jiexiang Xia, Chuanjing Huang, Huilin Wan

Abstract:
Novel visible-light-driven AgX/g-C₃N₄ (X= Br, I) hybrid materials were synthesized by the facile water bath method. The AgX/g-C₃N₄ hybrid materials were characterized by X-ray diffraction (XRD), energy dispersive X-ray spectrometer (EDS),transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), UV–visdiffuse reflectance spectroscopy (DRS),photoluminescence (PL), Fourier transform infrared spectra (FTIR), Raman and the special surface area. The XRD, EDS, TEM, FTIR, Raman and XPS analyses indicated that AgX nanoparticles were evenly distributed on the surface of g-C₃N₄ and the heterostructures were formed. The photocatalytic activity ofthe AgX/g-C₃N₄ hybrid materials was evaluated usingmethyl orange as a target organic pollutant. The as-preparedAgX/g-C₃N₄ hybridmaterials displayed much higher photocatalytic activity than the pure g-C₃N₄ and AgX nanoparticles. After the introduction of AgX nanoparticles, the photocurrent of the AgBr/g-C₃N₄ and AgI/g-C₃N₄ hybrid materials was found to increase by 21 and 8 times than that ofthe pure g-C₃N₄, respectively. The increased photocatalytic activity of the AgX/g-C₃N₄ hybrid materials was attributed to the synergic effect between g-C₃N₄ and AgX, which included the optical property, the better dispersion and the small size. A photocatalytic mechanism and the kinetics of AgX/g-C₃N₄ hybrid materials were also proposed.

Keywords:
g-C₃N₄ Silver halide
Graphite-like structure
Hybrid material
Photocatalytic

Published in: Applied catalysis B: Environmental  (Volume 129, Pages 1-614, 17 January 2013)

Publisher: Elsevier  

ISSN Information: 0926-3373

Novel visible-light-driven AgX/graphite-like C3N4 (X = Br, I) hybrid materials with synergistic photocatalytic activity

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