Effect of precursor ratio on the structural characteristics and photocatalytic activity of g-C3N4/SiO2 composite materials
DOI:
https://doi.org/10.62239/Keywords:
CN/SiO₂, photocatalysis, Rhodamine B, visible light, compositeAbstract
In this study, a g-C₃N₄/SiO₂ (CN/SiO₂) composite material was synthesized via a thermal polymerization method using urea as the precursor for g-C₃N₄ and SiO₂ prepared from tetraethyl orthosilicate (TEOS). The effect of the urea/SiO₂ precursor ratio on the structural characteristics and photocatalytic activity of the material was investigated. The synthesized materials were characterized using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), ultraviolet–visible diffuse reflectance spectroscopy (UV-Vis DRS) and photoluminescence (PL) spectroscopy. The results demonstrated the successful formation of the CN/SiO₂ composite, with SiO₂ particles uniformly distributed on the surface of g-C₃N₄ without significantly altering its crystal structure. The CN/SiO₂-30 sample exhibited the lowest photoluminescence intensity, indicating a more effective suppression of photogenerated electron–hole pair recombination compared with the other samples. The photocatalytic activity was evaluated through the degradation of rhodamine B (RhB) under visible-light irradiation. The results showed that the CN/SiO₂-30 sample achieved the highest RhB degradation efficiency, reaching 82.2% after 90 minutes of irradiation, with an apparent reaction rate constant of 0.0193 min⁻¹. In addition, the effects of the initial RhB concentration and solution pH on the photocatalytic process were also investigated.
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Copyright (c) 2026 Phan Thi Thuy Trang, Nguyen Tan Lam, Trinh Ngoc Dat, Le Vu Truong Son, Dinh Thanh Khan, Le Thi Hoa, Nguyen Phi Hung, Nguyen Thi Lan
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