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Effect of Nitric Acid Activation Melamine Precursor on Structure and Visible-Light Photocatalytic Performance of g-C3N4
Author NameAffiliationE-mail
YE Shi-Xiong College of Chemicaland Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, China  
SHU Qing College of Chemicaland Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, China shuqing@jxust.edu.cn 
Abstract: 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.
Keywords: melamine  g-C3N4  photocatalysis  stability  visible light
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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.
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Chinese Journal of Inorganic Chemistry