Physicochemical properties and photocatalytic activity of H3PW12O40/TiO2

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• 作者：Na Li ; A. V. Vorontsov ; Liqiang Jing
• 刊名：Kinetics and Catalysis
• 出版年：2015
• 出版时间：May 2015
• 年：2015
• 卷：56
• 期：3
• 页码：308-315
• 全文大小：887 KB
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• 作者单位：Na Li (1) (2)
  A. V. Vorontsov (1)
  Liqiang Jing (2)
  
  1. Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090, Russia
  2. Heilongjiang University, Harbin, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Catalysis
  Physical Chemistry
  Russian Library of Science
  
• 出版者：MAIK Nauka/Interperiodica distributed exclusively by Springer Science+Business Media LLC.
• ISSN：1608-3210

文摘

For enhancing its photocatalytic activity, titanium dioxide P25 has been modified by adsorption of the heteropoly acid (HPA) H3PW12O40 from aqueous solution at an HPA concentration of 0.2 to 5 mmol/L. The deposition of the HPA does not alter the phase composition or morphology of the photocatalyst but only causes a slight change in its diffuse reflectance spectrum. IR spectroscopic and XPS studies have confirmed that the HPA molecules on the TiO2 surface are intact. The adsorption of the HPA increases the photovoltage and hydroxyl radical yield under UV irradiation. These characteristics reach their maximum values upon the adsorption of the HPA from its 0.5 mmol/L solution. Electrochemical measurements have demonstrated that the HPA increases the rate of interfacial electron transfer. The deposition of the HPA accelerates the gas-phase oxidation of acetaldehyde and the degradation of phenol and triethyl phosphate in the aqueous medium. The highest activity is shown by the catalyst obtained by the adsorption of H3PW12O40 from its 0.5 mM solution. The results of this study suggest that the HPA is promising for modifying the surface of the TiO2 photocatalyst.