Degradation of methyl orange by electro-Fenton-like process in the presence of chloride ion

Wenyan HeSchool of Chemistry and Chemical Engineering, Institute of Energy Chemistry, Shaanxi Normal University, Xi’an710062, China, Tel. +86 29 81530726; Fax: +86 29 81530727

Xiaoning YanXi’an Hangjie Chemical Technology Co., Ltd, Shaanxi Province710067, China.

Hongzhu MaSchool of Chemistry and Chemical Engineering, Institute of Energy Chemistry, Shaanxi Normal University, Xi’an710062, China, Tel. +86 29 81530726; Fax: +86 29 81530727Correspondence[email protected]

Jie YuSchool of Chemistry and Chemical Engineering, Institute of Energy Chemistry, Shaanxi Normal University, Xi’an710062, China, Tel. +86 29 81530726; Fax: +86 29 81530727

Jing WangSchool of Chemistry and Chemical Engineering, Institute of Energy Chemistry, Shaanxi Normal University, Xi’an710062, China, Tel. +86 29 81530726; Fax: +86 29 81530727

Xiaoli HuangSchool of Chemistry and Chemical Engineering, Institute of Energy Chemistry, Shaanxi Normal University, Xi’an710062, China, Tel. +86 29 81530726; Fax: +86 29 81530727

Abstract

The degradation of azo dye methyl orange (MO) in wastewater by several electrochemical processes, especially the electro-Fenton-like process with chloride ion, was investigated. The effect of some important operating parameters, Fe³⁺ and Cl⁻ dosage, the initial concentration of MO on the decolorization and COD removal was also investigated. The response surface methodology was selected to optimize the operating conditions, and the results showed that almost 100% color and 78.93% COD removal efficiency were obtained, when [Fe³⁺] = 2.14 mM, [Cl⁻] = 16.36 mM, [MO] = 106 mg L⁻¹, [Na₂SO₄] = 0.05 M, pH = 3 at 2.1 A, and approximately 96.93% COD removal was achieved after 90 min of electrolysis and 8 min centrifuged with speed of 500 r min⁻¹. The oxidation kinetics of the process and the reaction order were also studied.

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Degradation of methyl orange by electro-Fenton-like process in the presence of chloride ion

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Degradation of methyl orange by electro-Fenton-like process in the presence of chloride ion

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