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首页> 外文期刊>Environmental Science & Technology >Dual Electrodes Oxidation of Dye Wastewater with Gas Diffusion Cathode
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Dual Electrodes Oxidation of Dye Wastewater with Gas Diffusion Cathode

机译：气体扩散阴极双电极氧化染料废水

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摘要

The high energy cost of an electrochemical method is the fatal drawback that hinders its large scale application in wastewater treatment. In traditional single-chamber electrolysis cell, only direct oxidation at an anode exists. Although a small amount of hydrogen peroxide is produced at the cathode by reduction, it is transferred to the anode and destroyed there without adding much benefit to organic decomposition. A two-chamber electrolytic cell, connected with an electrolyte bridge, was developed in this work. In this new reactor, direct oxidation at anode and indirect oxidation by hydrogen peroxide at cathode can occur simultaneously. Therefore "dual electrodes oxidation" in one electrochemical reactor was achieved successfully. Compared to a traditional one cell reactor, this reactor cuts the energy cost by 50%, and thus might lead to reconsideration of the electrochemical role in wastewater treatment. A Pt/C gas diffusion electrode (GDE) is fabricated and used as a cathode fed with oxygen-containing gases to produce hydrogen peroxide. When purified air diffuses through the active layer on the GDE, oxygen is reduced to hydrogen peroxide with a high yield to decompose organics. It has been found that the direct oxidation process at an anodic zone is slightly affected by factors such as pH variation, Fe(II) existence and aeration, while indirect oxidation at the cathodic zone is strongly affected. Dye used as a model pollutant was oxidized into small organic acids in both anode and cathode regions in this electrolytic reactor. GC-MS and IR spectrum were employed to analyze the intermediates formed during the degradation. Twenty intermediates have been detected, including 14 esters, 3 acids and 3 compounds with NO{sub}2 or N-OH groups. Thereafter, the degradation pathways of dye Acid Red B are proposed.
机译：电化学方法的高能量成本是致命的缺点，阻碍了其在废水处理中的大规模应用。在传统的单室电解槽中，仅存在阳极处的直接氧化。尽管通过还原在阴极上产生了少量的过氧化氢，但过氧化氢被转移到阳极并在那里被破坏，而对有机分解没有太大的好处。在这项工作中，开发了一个与电解质桥连接的两腔电解池。在这种新的反应器中，阳极同时发生直接氧化，而阴极发生过氧化氢间接氧化同时发生。因此，成功地在一个电化学反应器中实现了“双电极氧化”。与传统的单电池反应器相比，该反应器将能源成本降低了50％，因此可能导致对废水处理中电化学作用的重新考虑。制备了Pt / C气体扩散电极（GDE），并将其用作供入含氧气体以产生过氧化氢的阴极。当纯净空气通过GDE上的活性层扩散时，氧气以高收率被还原为过氧化氢以分解有机物。已经发现，在阳极区的直接氧化过程受到诸如pH变化，Fe（II）存在和通气等因素的轻微影响，而在阴极区的间接氧化受到很大影响。在该电解反应器中，用作模型污染物的染料在阳极和阴极区域均被氧化成小的有机酸。使用GC-MS和IR光谱分析降解过程中形成的中间体。已检测到20种中间体，包括14种酯，3种酸和3种具有NO {sub} 2或N-OH基团的化合物。此后，提出了染料酸性红B的降解途径。

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