Citation: Guo-Min LI, Bing WANG, Rui WANG. g-C₃N₄/Ag/GO Composite Photocatalyst with Efficient Photocatalytic Performance: Synthesis, Characterization, Kinetic Studies, Toxicity Assessment and Degradation Mechanism[J]. Chinese Journal of Structural Chemistry, ;2020, 39(9): 1675-1688. doi: 10.14102/j.cnki.0254-5861.2011-2685 shu

g-C₃N₄/Ag/GO Composite Photocatalyst with Efficient Photocatalytic Performance: Synthesis, Characterization, Kinetic Studies, Toxicity Assessment and Degradation Mechanism

Guo-Min LI ^a ,
Bing WANG ^b ,
Rui WANG ^a,,

a.
School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
b.
College of Chemical Engineering, Northeast Electric Power University, Jilin 132012, China

Corresponding author: Rui WANG, wangrui001@hit.edu.cn
Received Date: 4 December 2019
Accepted Date: 6 March 2020

Fund Project: the National Natural Science Foundation of China 11374080

Figures(10)

The g-C₃N₄/Ag/GO (CNAG) photocatalysts were synthesized by a facile two-step reaction route. The as-prepared CNAG samples were characterized by X-ray diffraction (XRD), Fourier transform-infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), photoluminescence spectroscopy (PL) and ultraviolet-visible diffuse reflectance spectroscopy techniques (UV-vis DRS). The photocatalytic activity was obtained by degrading rhodamine B (RhB) under simulated sunlight and the results showed that photocatalytic activity of CNAG was much higher than that of pure g-C₃N₄ and g-C₃N₄/Ag. When the mass ratio of GO was 6%, the as-prepared CNAG-6% sample possessed the highest photocatalytic activity and the kinetic constant of RhB degradation was 0.077 min^-1, which was almost 4.3 times higher than that of pure g-C₃N₄ (0.018 min^-1) and 2.5 times higher than that of the g-C₃N₄/Ag (0.031 min^-1) composite, respectively. The toxicity of CNAG samples was assessed via seed germination experiment and no significant inhibitory effect was observed. The enhanced photocatalytic activity could be attributed to the synergistic effect of partial surface plasma resonance (SPR) effect of Ag, strong visible light absorption and the high separation efficiency of photon-generated carrier. The CNAG-6% sample exhibited excellent stability during the cycle experiment. Finally, a possible photocatalytic mechanism was proposed.
- g-C₃N₄,
- g-C₃N₄/Ag/GO,
- photocatalytic degradation,
- simulated sunlight irradiation,
- toxicity assessment
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g-C3N4/Ag/GO Composite Photocatalyst with Efficient Photocatalytic Performance: Synthesis, Characterization, Kinetic Studies, Toxicity Assessment and Degradation Mechanism

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通讯作者: 陈斌, bchen63@163.com

g-C₃N₄/Ag/GO Composite Photocatalyst with Efficient Photocatalytic Performance: Synthesis, Characterization, Kinetic Studies, Toxicity Assessment and Degradation Mechanism