Citation: HU Jin-Juan, MA Chun-Yu, WANG Jia-Lin, LENG Chao, QIN Fu-Wen, ZHANG Qing-Yu. Preparation and Photocatalytic Properties of GO/TiO₂-g-C₃N₄ Nanocomposites[J]. Chinese Journal of Inorganic Chemistry, ;2020, 36(12): 2240-2248. doi: 10.11862/CJIC.2020.241 shu

Preparation and Photocatalytic Properties of GO/TiO₂-g-C₃N₄ Nanocomposites

Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, School of Physics, Dalian University of Technology, Dalian, Liaoning 116024, China

Corresponding author: MA Chun-Yu, chunyuma@dlut.edu.cn
Received Date: 15 April 2020
Revised Date: 17 September 2020

Figures(6)

GO/TiO₂-g-C₃N₄ ternary composites having good visible light catalytic performances, which was based on the prepared 20%g-C₃N₄/TiO₂ composites (the mass fraction of g-C₃N₄ was 20%) by hydrothermal process, were successfully synthesized by mixing graphene oxide (GO) dispersions with different mass fractions. X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS), photoluminescence spectroscopy (PL), and transient photocurrent analytical tests are used to characterize and analyze the crystal structures, morphologies and optical properties of g-C₃N₄/ TiO₂-based photocatalysts. The effect of TiO₂-g-C₃N₄ compounded with different GO mass fractions on the degradation of methylene blue (MB) solution under visible light was studied. The results show that with the optimized amount of GO of 15%, the smallest anatase phase TiO₂ particles attached to the surface of g-C₃N₄ and GO sheets was found to be the enhancing photocatalytic efficiency, which can be attributed to higher light absorption and lower photoelectron-hole recombination rate in comparison with g-C₃N₄/TiO₂ binary composites or pure TiO₂. The degradation rate of MB by 15%GO/TiO₂-g-C₃N₄ composite could reach 98.4% within three hours, and its degradation rate constant (0.022 4 min^-1) was about 15 times and 9 times higher than those of pure TiO₂ (0.001 5 min^-1) and g-C₃N₄/ TiO₂ (0.002 5 min^-1), respectively.
- g-C₃N₄/TiO₂,
- GO,
- heterojunction,
- visible light catalysis
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