Photocatalytic degradation of pentachlorophenol by visible light Ν–F–TiO2 in the presence of oxalate ions: optimization, modeling, and scavenging studies

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• 作者：M. Antonopoulou ; I. Konstantinou
• 关键词：Photocatalysis ; Pentachlorophenol ; Oxalates ; N–F–TiO2 ; RSM ; Scavengers
• 刊名：Environmental Science and Pollution Research
• 出版年：2015
• 出版时间：June 2015
• 年：2015
• 卷：22
• 期：12
• 页码：9438-9448
• 全文大小：1,194 KB
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• 作者单位：M. Antonopoulou (1)
  I. Konstantinou (1)
  
  1. Department of Environmental and Natural Resources Management, University of Patras, 30100, Agrinio, Greece
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Environment
  Atmospheric Protection, Air Quality Control and Air Pollution
  Waste Water Technology, Water Pollution Control, Water Management and Aquatic Pollution
  Industrial Pollution Prevention
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1614-7499

文摘

The efficiency of heterogeneous photocatalysis using N-/em>F–TiO2 as photocatalyst to degrade a priority pollutant, pentachlorophenol (PCP), in the presence of oxalates (OA) was investigated in detail. Response surface methodology was used to optimize the effect of three variables (catalyst concentration, OA/PCP ratio, and pH) on the photocatalytic degradation of pentachlorophenol. A quadratic model was established as a functional relationship between three independent variables and the degradation efficiency of PCP. The results of model fitting and statistical analysis demonstrated that the pH played a key role in the degradation of PCP. Within the studied experimental ranges, the optimum conditions for maximum PCP degradation efficiency (97.5?%) were: catalyst concentration 600?mg?L?, OA/PCP ratio 2, and pH 10. The contribution of HO·, O2 ·?/sup>, and e?/sup> produced during the photocatalytic treatment was investigated with the addition of scavengers. The photocatalytic degradation was essentially proceeded through an oxidative mechanism at both acid and alkaline pH values by HO. and O2 ·?/sup> radicals attack. It was found that O2 ·?/sup> were the major reactive species involved in PCP degradation in pH 4 and HO· in pH 10.