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Progress in Chemistry 2015, Vol. 27 Issue (8): 1123-1132 DOI: 10.7536/PC141233 Previous Articles   Next Articles

Treatment of Organic Pollutants Using Electro-Fenton and Electro-Fenton-Like Process in Aqueous Solution

Lin Heng, Zhang Hui*   

  1. Department of Environmental Engineering, Wuhan University, Wuhan 430079, China
  • Received: Revised: Online: Published:
  • Supported by:
    The work was supported by the National High?Tech R&D Program of China (No. 2008AA06Z332), Wuhan Science and Technology Bureau through “The Gongguan Project”(No. 201060723313), and the Fundamental Research Funds for the Central Universities (No. 2012205020207).
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Conventional Fenton process is one of the promising advanced oxidation technologies (AOTs) for the treatment of organic pollutants in water. In Fenton process, hydroxyl radical (·OH), a kind of strong oxidant, is formed through Fenton's reaction and then degrades organic pollutants. Similar to conventional Fenton process, transition metal ions (Fe2+, Co2+, Ag+, etc.) can also activate persulfate (PS) and generate sulfate radicals (SO4·-, SR). Sulfate radical is a powerful oxidant and can oxidize most of organic pollutants. This process is named as “Fenton-like process”. There are some disadvantages existed in conventional Fenton and Fenton-like process. For example, a high concentration of Fe2+ is required and a large amount of iron sludge is generated. In order to solve these problems, electro-Fenton and SR-based electro-Fenton-like processes are proposed. Fe2+ can be regenerated via cathodic reduction in electro-Fenton and electro-Fenton-like processes. Therefore, the Fe2+ concentration used in these processes is much lower than that in Fenton and Fenton-like processes. This paper provides an overview of mechanism and research progress of electro-Fenton and SR-based electro-Fenton-like processes. The types and improvements for electro-Fenton and electro-Fenton-like processes are summarized. Moreover, the prospects of the research areas meriting further investigation and developed trends are pointed out.

Contents
1 Introduction
2 Electro-Fenton process
2.1 Types of electro-Fenton processes
2.2 Improvements in electro-Fenton processes
3 Electro-Fenton-like process
3.1 Types of electro-Fenton-like processes
3.2 The effect of important parameters on electro-Fenon-like processes
3.3 Improvements in electro-Fenton-like processes
4 Comparison of oxidation mechanism
5 Conclusion and perspective

Key words: electro-Fenton, electro-Fenton-like, hydroxyl radicals, sulfate radicals, organic pollutants

CLC Number: 

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