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首页> 外文期刊>Environmental Science & Technology >Electrochemical oxidation of hydroquinone, resorcinol, and catechol on boron-doped diamond anodes
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Electrochemical oxidation of hydroquinone, resorcinol, and catechol on boron-doped diamond anodes

机译：掺硼金刚石阳极上对苯二酚，间苯二酚和邻苯二酚的电化学氧化

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摘要

The electrochemical oxidation of aqueous wastes polluted with hydroquinone, resorcinol, or catechol on borondoped diamond electrodes has been studied. The complete mineralization of the organic waste has been obtained independently of the nature of each isomer. No aromatic intermediates were found during the treatment, and solely aliphatic intermediates (carboxylic acids C-4 and C-2, mainly) were detected in the three cases. Although as from the bulk electrolyses study no differences in the electrochemical oxidation of dihydroxybenzenes seem to exist, different voltammetric behavior between resorcinol and the other two isomers was obtained in the voltammetric study. Catechol and hydroquinone have a reversible quinonic form, and a cathodic reduction peak appears in their voltammograms. The characterization of the first steps in the electrochemical oxidation of the three dihydroxybenzenes showed the formation of a larger number of intermediates in the oxidation of catechol, although no carbon dioxide was detected in its oxidation. Conversely, the oxidation of resorcinol and hydroquinone lead to the formation of important concentrations of carbon dioxide. The nondetection of aromatic intermediates, even if small quantities of charge are passed, confirms that the oxidation must be carried out directly on the electrode surface or by hydroxyl radicals generated by decomposition of water.
机译：研究了在对接的金刚石电极上对苯二酚，间苯二酚或邻苯二酚污染的含水废物的电化学氧化。与每种异构体的性质无关，已经获得了有机废物的完全矿化作用。在处理过程中未发现芳族中间体，在这三种情况下仅检测到脂族中间体（主要是羧酸C-4和C-2）。尽管从本体电解研究来看，似乎不存在二羟基苯的电化学氧化差异，但在伏安法研究中，间苯二酚与其他两种异构体的伏安行为不同。邻苯二酚和对苯二酚具有可逆的喹啉形式，并且在其伏安图中出现阴极还原峰。三种二羟基苯的电化学氧化第一步的表征表明，儿茶酚氧化过程中形成了大量中间体，尽管在氧化过程中未检测到二氧化碳。相反，间苯二酚和对苯二酚的氧化导致形成重要浓度的二氧化碳。即使通过少量电荷也未检测到芳族中间体，这证实了氧化必须直接在电极表面进行或通过水分解产生的羟基进行。

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