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Degradation of phenol and trichlorophenol by heterogeneous photo-Fenton process using Granular Ferric Hydroxide®: comparison with homogeneous system
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  • 作者:V. Kavitha ; K. Palanivelu
  • 关键词:Granular ferric hydroxide (GFH) ; Heterogeneous photo ; Fenton process ; Homogeneous photo ; Fenton process ; Hydroxyl radical ; Intermediates ; Mineralization
  • 刊名:International Journal of Environmental Science and Technology
  • 出版年:2016
  • 出版时间:March 2016
  • 年:2016
  • 卷:13
  • 期:3
  • 页码:927-936
  • 全文大小:655 KB
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  • 作者单位:V. Kavitha (1)
    K. Palanivelu (2)

    1. Department of Chemistry, Sathyabama University, Chennai, Tamil Nadu, 600119, India
    2. Centre for Environmental Studies and Centre for Climate Change and Adaptation Research, Anna University, Chennai, Tamil Nadu, 600025, India
  • 刊物主题:Environment, general; Environmental Science and Engineering; Environmental Chemistry; Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution; Soil Science & Conservation; Ecotoxicology;
  • 出版者:Springer Berlin Heidelberg
  • ISSN:1735-2630
文摘
The decomposition of phenol and trichlorophenol (TCP) by using granular ferric hydroxide (GFH) as a photo-Fenton catalyst was investigated and compared with homogeneous photo-Fenton process. Experiments were conducted in a batch mode, duplicate for the degradation of phenol and TCP in the presence of solar light for both the processes. The effect of operating variables for heterogeneous photo-Fenton process like pH, peroxide concentration and GFH concentration on the degradation of the model compounds was optimized by univariate approach. The optimum conditions for the degradation of phenol and TCP were pH 3.0 ± 0.2, peroxide concentration 29.4 mM for phenol and 14.7 mM for TCP at GFH concentration of 0.5 g/500 mL. At optimum conditions, the mineralization efficiency of phenol and TCP by heterogeneous process was compared with homogeneous process. The mineralization efficiency for phenol and TCP was 96 and 86 %, respectively, for heterogeneous photo-Fenton process, while almost complete mineralization (~96 %) was observed for homogeneous process. In heterogeneous photo-Fenton process, longer reaction time was witnessed for complete mineralization of the compounds studied. Low molecular weight aliphatic acids like oxalic acid, acetic acid and inorganic chloride ion (in case of TCP) were observed during both the processes. In these processes, the reaction proceeds by hydroxyl radical (·OH) abstraction of the model compound studied. The mineralization of phenol and TCP obeys pseudo-first-order kinetics irrespective of the processes studied. The results indicate that GFH can be an effective heterogeneous photo-Fenton catalyst for the degradation of phenol and TCP. Keywords Granular ferric hydroxide (GFH) Heterogeneous photo-Fenton process Homogeneous photo-Fenton process Hydroxyl radical Intermediates Mineralization

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