Synthesis and photocatalytic activity of V-doped mesoporous TiO2 photosensitized with porphyrin supported by SBA-15

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• 作者：Ahmad Najafian ; Rahmatollah Rahimi ; Solmaz Zargari…
• 关键词：Mesoporous TiO2 ; V ; doped ; Porphyrin ; SBA ; 15 ; Degradation ; 2 ; 4 ; Dichlorophenol
• 刊名：Research on Chemical Intermediates
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：42
• 期：4
• 页码：3441-3458
• 全文大小：1,846 KB
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• 作者单位：Ahmad Najafian (1)
  Rahmatollah Rahimi (1)
  Solmaz Zargari (1)
  Masoumeh Mahjoub-Moghaddas (1)
  Azadeh Nazemi (1)
  
  1. Department of Chemistry, Iran University of Science and Technology, Tehran, 16846-13114, Iran
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Catalysis
  Physical Chemistry
  Inorganic Chemistry
  
• 出版者：Springer Netherlands
• ISSN：1568-5675

文摘

A highly efficient photocatalyst was produced by immobilizing V-doped mesoporous TiO₂/tetrakis(4-carboxyphenyl)porphyrin (V-TiO₂/TCPP) onto SBA-15 walls, and was then investigated for photodecomposition of 2,4-dichlorophenol (2,4-DCP) in aqueous solutions. In the present paper, first, in order to activate titanium dioxide by visible light, the TiO₂ mesoporous was doped by vanadium (V-TiO₂) and then it was sensitized by tetrakis(4-carboxyphenyl)porphyrin (TCPP). To improve the photocatalytic activity of the prepared catalyst, SBA-15 was functionalized with the prepared V-TiO₂/TCPP by pre-anchorage of 3-(aminopropyl)-triethoxysilane via post-synthesis method (V-TiO₂/TCPP/SBA). The obtained materials were characterized by UV–Vis absorption, FT-IR spectroscopy, diffuse reflectance (DRS), scanning electron microscopy, X-Ray diffraction, and N₂ adsorption–desorption. Furthermore, a comparative study on the photodegradation of 2,4-DCP between V-TiO₂/TCPP/SBA and V-TiO₂/TCPP composites was performed and the role of SBA-15 was investigated. The results showed that the decomposition efficiency of the 2,4-DCP by using the V-TiO₂/TCPP/SBA was much more than that of applying TCPP/V-TiO₂ in high initial concentration of pollutant (up to 99 % in 300 mg/L). In addition, the photocatalytic degradations of 2,4-DCP using above photocatalysts all followed a first-order kinetic model. The V-TiO₂/TCPP/SBA was recycled four times without significant loss of photocatalytic activity.