The Advanced Oxidation Processes (AOPs) are promising environmentally friendly technologies for the treatment of wastewater containing organic pollutants in general and particularly dyes. The aim of this work is to determine which of the AOP processes based on the Fenton reaction is more effective in degrading the methyl orange (MO) dye. The comparative study of the Fenton, photo-Fenton (PF) and electro-Fenton (EF) processes has shown that electro-Fenton is the most efficient method for oxidizing Methyl Orange. The evolution of organic matter degradation was followed by absorbance (discoloration) and COD (mineralization) measurements. The kinetics of the MO degradation by the electro-Fenton process is very rapid and the OM degradation rate reached 90.87% after 5 min. The influence of some parameters such as the concentration of the catalyst (Fe (II)), the concentration of MO, the current density, the nature and the concentration of supporting electrolyte was investigated. The results showed that the degradation rate increases with the increase in the applied current density and the concentration of the supporting electrolyte. The study of the concentration effect on the rate degradation revealed optimal values for the concentrations 2.10 −5 M and 75 mg L −1 of Fe (II) and MO respectively.

中文翻译：

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三种不同高级氧化工艺去除水溶液中甲基橙的对比研究

高级氧化工艺 (AOP) 是一种很有前途的环保技术，用于处理一般含有有机污染物的废水，尤其是染料。这项工作的目的是确定哪种基于芬顿反应的 AOP 工艺在降解甲基橙 (MO) 染料方面更有效。芬顿、光芬顿 (PF) 和电芬顿 (EF) 工艺的比较研究表明，电芬顿是氧化甲基橙最有效的方法。有机物降解的演变之后是吸光度（变色）和 COD（矿化）测量。电芬顿法降解 MO 的动力学非常快，5 分钟后 OM 降解率达到 90.87%。考察了催化剂(Fe(II))浓度、MO浓度、电流密度、支持电解质的性质和浓度等参数的影响。结果表明，降解速率随着外加电流密度和支持电解质浓度的增加而增加。浓度对速率降解影响的研究揭示了 Fe (II) 和 MO 的浓度分别为 2.10 -5 M 和 75 mg L -1 的最佳值。