A dual-cathode electro-Fenton oxidation coupled with anodic oxidation system used for 4-nitrophenol degradation
A dual-cathode electro-Fenton oxidation coupled with anodic oxidation system used for 4-nitrophenol degradation
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双阴极电芬顿氧化结合阳极氧化系统用于4-硝基苯酚降解
DOI：
10.1016/j.jhazmat.2011.10.079
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发表时间：
2012-01-15
影响因子：
13.6
通讯作者：
Deng, X. L.
中科院分区：
文献类型：
--
作者：
Chu, Y. Y.;Qian, Y.;Deng, X. L.
采用一种新型的电化学氧化体系研究了4-硝基苯酚在Ti/SnO_2-Sb_2O_5-IrO_2电极上的阳极氧化和双阴极电Fenton氧化。该体系采用气体扩散电极(GDE)进行氧气还原生成过氧化氢，采用石墨电极对Fe3+进行还原，再生Fe2+。当GDE和石墨阴极的电势分别控制在-0.80和-0.10V/SCE时，Fe2+降解对硝基苯酚的最佳浓度约为0.10 mM，远低于单阴极体系中的0.25 mM。由于电芬顿氧化和阳极氧化的结合，实现了有效的降解和高的矿化电流效率(MCE)。经600min处理后，双阴极氧化系统可去除74.5%的原TOC。此外，还证实了模拟废水中57.0%的原始氮可以被以气态形式去除。这些结果表明，该电化学氧化过程可能为有机污染物的降解提供了一种替代方法。(C)2011爱思唯尔B.V.保留所有权利。
The degradation of 4-nitrophenol was investigated using a novel electrochemical oxidation system, in which the anodic oxidation at Ti/SnO2-Sb2O5-IrO2 electrode and the electro-Fenton oxidation with two cathodes were involved. In this system, gas diffusion electrode (GDE) was used to generate H2O2 by O-2 reduction and graphite electrode was employed for the reduction of Fe3+ regenerating Fe2+. When the potential values of GDE and graphite cathode were controlled at -0.80 and -0.10 V/SCE respectively, the optimum Fe2+ concentration for 4-nitrophenol degradation was about 0.10 mM, much lower than the concentration of 0.25 mM obtained in the single-cathode system. Due to the combination of electro-Fenton oxidation and anodic oxidation, an effective degradation and a high mineralization current efficiency (MCE) were achieved. After 600 min treatment, 74.5% of the original TOC was removed by the dual-cathode oxidation system. Moreover, it was confirmed that 57.0% of the original nitrogen could be removed in gaseous form from the simulated wastewater. These results indicate that this electrochemical oxidation process might provide an alternative for the degradation of organic pollutants. (C) 2011 Elsevier B.V. All rights reserved.