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| Visible light degradation of methylene blue from water by triangle Au@TiO2 mesoporous catalyst |
| Author Name | Affiliation | E-mail | | LIU Bing | Beijing Capital Eco-Environment Protection Group Co., Ltd., Beijing 100037, China
Beijing Capital Beike Environmental Technology Research Institute Co., Ltd., Beijing 100044, China | | | ZHANG Huang | College of Environment and Energy Engineering, Beijing University of Technology, Beijing 100124, China | 18010156720@163.com | | HAN Hongliang | Department of Chemistry, Capital Normal University, Beijing 100089, China | | | HU Changwen | College of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 102401, China | | | ZHANG Yinglei | Beijing Capital Eco-Environment Protection Group Co., Ltd., Beijing 100037, China
Beijing Capital Beike Environmental Technology Research Institute Co., Ltd., Beijing 100044, China | |
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| Abstract: 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 finitedifference time-domain (FDTD) analysis, we proposed a mechanism for the photodegradation process. |
| Keywords: photodegradation TiO2 triangle Au particle visible light |
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| LIU Bing,ZHANG Huang,HAN Hongliang,HU Changwen,ZHANG Yinglei.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. |
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