Citation: Bing LIU, Huang ZHANG, Hongliang HAN, Changwen HU, Yinglei ZHANG. Visible light degradation of methylene blue from water by triangle Au@TiO2 mesoporous catalyst[J]. Chinese Journal of Inorganic Chemistry, ;2024, 40(5): 941-952. doi: 10.11862/CJIC.20230398 shu

Visible light degradation of methylene blue from water by triangle Au@TiO2 mesoporous catalyst

  • Corresponding author: Huang ZHANG, 18010156720@163.com
  • Received Date: 21 October 2023
    Revised Date: 10 January 2024

Figures(14)

  • TiO2-coated triangle Au with a core-shell structure (Au@TiO2) was synthesized using the sol-gel method. After hydrothermal crystallization, the particle size expanded to 300 nm with crystallization of the shell TiO2 into a mesoporous anatase phase, while the morphology of the triangle Au particle remained unchanged. The structure and properties of the samples were characterized using powder X-ray diffraction (PXRD), ζ potential, high-resolution transmission electron microscopy (HRTEM), thermogravimetric analysis (TGA), photoluminescence (PL) spectroscopy, photocurrent (i-t) measurements, and methylene blue (MB) photodegradation tests. The results revealed that the photocatalytic degradation rate of crystallized triangle Au@TiO2 was significantly higher than that of the amorphous material. Specifically, 1 mg·mL-1 Au@c-TiO2 achieved complete degradation of 60 mg·L-1 MB after one hour of visible light irradiation. An electron paramagnetic resonance (EPR) experiment was conducted, indicating that ·O2- and ·OH are the active species responsible for the degradation process. By combining experimental results with finite-difference time-domain (FDTD) analysis, we proposed a mechanism for the photodegradation process.
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