Strategies for Effective Degradation of Methyl Orange Dye in Aqueous Solution via Electrochemical Treatment with Copper/Graphite Electrodes

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-04-04 DOI:10.3311/ppch.22645

K. Oguzie, John O. Anyanwu, Onyinyechi U. Enyia, Chikwado E. Anene, L. Vrsalović, Emeka Emanuel Oguzie

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Abstract

This study investigated the electrochemical degradation of methyl orange dye (MO) in aqueous solution using copper/graphite electrodes as anode and cathode respectively. The process parameters such as electrolyte concentrations, current density, pH and temperature were analyzed. The results proved that copper/graphite electrodes were effective for MO degradation and the reaction followed the first-order kinetic model. The degradation efficiency decreased with increasing MO concentration and increased steadily with current density. The pH trend with degradation efficiency was pH 9 (98%) > pH 7 (96%) > pH 3 (77%) after 70 min of electrolysis time, which shows that the alkaline conditions favoured the degradation process. Fourier transform infrared spectroscopy (FTIR) and UV–Vis absorption spectroscopy confirmed the dye degradation process, with the formation of degradation intermediates. The FTIR results revealed that the oxidative degradation of MO may be initiated at the N=N azo bond, which was confirmed by quantum chemical modelling of the electronic structure parameters of MO.

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通过铜/石墨电极的电化学处理有效降解水溶液中甲基橙染料的策略

本研究采用铜/石墨电极分别作为阳极和阴极，对水溶液中甲基橙染料（MO）的电化学降解进行了研究。研究分析了电解质浓度、电流密度、pH 值和温度等工艺参数。结果证明，铜/石墨电极能有效降解 MO，且反应遵循一阶动力学模型。降解效率随 MO 浓度的增加而降低，随电流密度的增加而稳步上升。电解 70 分钟后，降解效率的 pH 值变化趋势为 pH 9（98%）> pH 7（96%）> pH 3（77%），这表明碱性条件有利于降解过程。傅立叶变换红外光谱（FTIR）和紫外可见吸收光谱证实了染料的降解过程，并形成了降解中间体。傅立叶变换红外光谱结果表明，MO 的氧化降解可能是从 N=N 偶氮键处开始的，这一点通过对 MO 的电子结构参数进行量子化学建模得到了证实。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.