Electrochemical abatement of chloroethanes in water: Reduction, oxidation and combined processes
Electrochemical abatement of chloroethanes in water: Reduction, oxidation and combined processes
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DOI：
10.1016/j.electacta.2009.09.039
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发表时间：
2010-01-01
影响因子：
6.6
通讯作者：
Randazzo, Serena
中科院分区：
文献类型：
--
作者：
Scialdone, Onofrio;Galia, Alessandro;Randazzo, Serena
提出了一种基于阳极氧化为二氧化碳，阴极还原为脱卤烃的电化学法处理受氯乙烷污染的水。对1，2-二氯乙烷和1，1，2，2-四氯乙烷两种模型化合物进行了银的阴极还原、掺硼金刚石(BDD)的阳极氧化和组合工艺的电化学去除。阳极氧化导致这些化合物的浓度和COD的浓度都有很高的降低。1，1，2，2-四氯乙烷的还原也有很高的减少量，但会形成一些卤化中间体和最终产物，即使在低浓度下也是如此。另一方面，对于1，2-二氯乙烷的还原，获得了较低的减少量。当还原和氧化过程同时进行时，与非耦合过程相比，在相同的通过电荷量(例如，通过时间)和施加的电池电压下，可以获得更高的污染物减少量。此外，在1，1，2，2-四氯乙烷的情况下，当在未分离的电解槽中执行组合工艺时，在电解液末端没有检测到其他卤化产物。(C)2009爱思唯尔有限公司。保留所有权利。
An electrochemical route, based on the anodic oxidation to carbon dioxide coupled with the cathodic reduction to de-halogenated hydrocarbons, was proposed for the treatment of waters contaminated by chloroethanes. The electrochemical abatement of two model compounds, namely 1,2-dichloroethane and 1,1,2,2-tetrachloroethane, was carried out by cathodic reduction at silver, anodic oxidation at boron doped diamond (BDD) and combined processes. The anodic oxidation gives rise to a high abatement of the concentration of both these compounds and of COD. The reduction of 1,1,2,2-tetrachloroethane proceeds also with high abatement but with the formation of some halogenated intermediates and final products, even if in low concentrations. Lower abatements were, on the other hand, obtained for the reduction of 1,2-dichloroethane. When reduction and oxidation processes were carried out simultaneously, a higher abatement of pollutants was obtained with the same amount of the passed charge (e.g., passed time) and applied cell voltage with respect to uncoupled processes. Furthermore, in the case of 1,1,2,2-tetrachloroethane, no other halogenated products were detected at the end of the electrolyses when the combined process was performed in an undivided cell. (C) 2009 Elsevier Ltd. All rights reserved.