Photocatalytic degradation of organic dyes with H₃PW₁₂O₄₀/TiO₂–SiO₂

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• 作者：Shui-Jin Yang ; Yu-Lin Xu ; Wen-Peng Gong ; Yong-Kui Huang ; Guo-Hong Wang…
• 关键词：Heteropoly acid ; TiO2 ; SiO2 ; Photocatalytic degradation ; Organic dye
• 刊名：Rare Metals
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：35
• 期：10
• 页码：797-803
• 全文大小：1,144 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Metallic Materials
  Chinese Library of Science
  
• 出版者：Journal Publishing Center of University of Science and Technology Beijing, in co-publication with Sp
• ISSN：1867-7185
• 卷排序：35

文摘

H₃PW₁₂O₄₀/TiO₂–SiO₂ was synthesized by impregnation method which significantly improved the catalytic activity under simulated natural light. The properties of the samples were characterized by Fourier transform infrared spectra (FTIR), X-ray powder diffraction pattern (XRD), Scanning electron micrographs (SEM), and Zeta potential. Degradation of methyl violet was used as a probe reaction to explore the influencing factors on the photodegradation reaction. The results show that the optimal conditions are as follows: initial concentration of methyl violet of 10 mg·L−1, pH of 3.0, catalyst dosage of 2.9 g·L−1, and light irradiation time of 2.5 h. Under these conditions, the degradation rate of methyl violet is 95.4 %. The reaction on photodegradation for methyl violet can be expressed as the first-order kinetic model, and the possible mechanism for the photocatalysis under simulated natural light is suggested. After used continuously for five times, the catalyst keeps the inherent photocatalytic activity for degradation of dyes. The photodegradation of methyl orange, methyl red, naphthol green B, and methylene blue was also tested, and the degradation rate of dyes can reach 81 %–100 %.