Citation: YE Shi-Xiong, SHU Qing. Effect of Nitric Acid Activation Melamine Precursor on Structure and Visible-Light Photocatalytic Performance of g-C₃N₄[J]. Chinese Journal of Inorganic Chemistry, ;2020, 36(1): 1-10. doi: 10.11862/CJIC.2019.262 shu

Effect of Nitric Acid Activation Melamine Precursor on Structure and Visible-Light Photocatalytic Performance of g-C₃N₄

YE Shi-Xiong ,
SHU Qing ^,

College of Chemicaland Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, China

Corresponding author: SHU Qing, shuqing@jxust.edu.cn
Received Date: 12 July 2019
Revised Date: 26 September 2019

Figures(12)

In order to shorten the migration pathway of e^- and h⁺ and improve the defect of recombination of photo-generated carriers in g-C₃N₄, this study used different molar concentrations of HNO₃ to activate melamine precursor, and formed a series of x-HNO₃-g-C₃N₄ (x=1, 2, 3, 4, 5 mol·L^-1) photocatalyst by forming a protonated amino group. In order to investigate the effect of the structure of the catalyst on its photocatalytic properties, all these above obtained photocatalysts were characterized by nitrogen gas adsorption-desorption isotherms, X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectra (XPS), photoluminescence (PL), ultraviolet-visible diffuse reflection (UV-Vis DRS), transient photocurrent spectroscopy (TCS), electrochemical impedance spectroscopy (EIS), etc. The difference of visible light catalytic degradation activity of x-HNO₃-g-C₃N₄ and g-C₃N₄ obtained by direct calcination of melamine was studied with the using of rhodamine B (RhB) as a simulated dye contaminant. The resuts of experimental showed that the photocatalytic activity of 3 mol·L^-1-HNO₃-g-C₃N₄ was the highest. Compared with g-C₃N₄ obtained by directly calcining melamine, the degradation rate of RhB increased from 38% to 99% within 60 minutes. The 3 mol·L^-1-HNO₃-g-C₃N₄ catalyst was recycled 4 times, and the catalytic effect was still 99%. The high catalytic activity and stability of x-HNO₃-g-C₃N₄ can be explained as follows:after activation of HNO₃, the melamine precursor can make the g-C₃N₄ product prepared by thermal polymerization have a higher degree of polymerization, thereby a multi-layer g-C₃N₄ with large specific surface area was obtained. The PL results showed that the fluorescence intensity was significantly reduced, and the carrier lifetime was significantly improved. The EIS results showed that the carrier transport capacity was significantly enhanced, which improved the photocatalytic activity of g-C₃N₄.
- melamine,
- g-C₃N₄,
- photocatalysis,
- stability,
- visible light
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Effect of Nitric Acid Activation Melamine Precursor on Structure and Visible-Light Photocatalytic Performance of g-C3N4

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通讯作者: 陈斌, bchen63@163.com

Effect of Nitric Acid Activation Melamine Precursor on Structure and Visible-Light Photocatalytic Performance of g-C₃N₄