Synthesis and characterization of g-C₃N₄/Ag₃VO₄ composites with significantly enhanced visible-light photocatalytic activity for triphenylmethane dye degradation

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• 作者：Shaomang Wang ; Dinglong Li ; Cheng Sun ; Shaogui Yang ; Yuan Guan ; Huan He
• 关键词：G-C3N4/Ag3VO4 ; Photocatalytic degradation ; Triphenylmethane dyes ; Degradation mechanism
• 刊名：Applied Catalysis B: Environmental
• 出版年：2014
• 出版时间：January, 2014
• 年：2014
• 卷：144
• 期：Complete
• 页码：885-892
• 全文大小：4783 K

文摘

The g-C₃N₄/Ag₃VO₄ hybrid photocatalysts were prepared by Ag₃VO₄ anchoring on the surface of g-C₃N₄. The transmission electron microscope, X-ray diffraction, Fourier transform infrared spectroscopy and X-ray photo-electron spectroscopy analyses demonstrated that Ag₃VO₄ nanoparticles well distributed on the surface of g-C₃N₄ and the g-C₃N₄/Ag₃VO₄ hetero-junctions were formed. Compared with pure g-C₃N₄ and Ag₃VO₄, the g-C₃N₄/Ag₃VO₄ hybrid materials displayed much higher photocatalytic activity for basic fuchsin degradation (20 mg/L, 50 mL) under visible-light irradiation. The 40 wt % g-C₃N₄/Ag₃VO₄ photocatalyst exhibited optimal removal rate constant of 0.92 h^?1, which was 11.5 and 6.6 times higher than that of pure g-C₃N₄ and Ag₃VO₄, respectively. Density functional theory calculations indicated that complementary conduction and valence band-edge hybridization between g-C₃N₄ and Ag₃VO₄ could apparently increase separation efficiency of electron-hole pairs of g-C₃N₄/Ag₃VO₄ composites, which was confirmed by photoluminescence spectra. In addition, it was found that h⁺ and ?O₂^?1generated in the photocatalytic process played a key role in basic fuchsin degradation.