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首页> 外文期刊>International Journal of Environmental Science and Technology >Electrochemical degradation of textile dyes in a flow reactor: effect of operating conditions and dyes chemical structure
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Electrochemical degradation of textile dyes in a flow reactor: effect of operating conditions and dyes chemical structure

机译：流动反应器中纺织染料的电化学降解：操作条件和染料化学结构的影响

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In this study, electrochemical oxidation of five azo dyestuffs (Yellow D-5GN, Red D-B8, Ruby F-2B, Blue D-5RN, Black DN), that are widely used in the textile industry, was investigated in a flow reactor. BDD electrode with a high boron doping level (C/B=10000) was prepared and used. Two configurations of reactor were considered, i.e., one with the undivided cell, and the other with the cell divided by anodic and cathodic compartments. The effect of current density and the initial pH of the solution on the dyestuff degradation process was investigated. As expected, higher degradation rate was found for higher current density, while the effect of pH was marginal. Next, electrochemical oxidation of azo dyestuffs with different chemical structures was investigated. Based on the cyclic voltammetry measurements, the correlation between the dyestuff removal rate and the oxidation potential value of dyestuff was found. These results suggest that the direct oxidation of dyestuffs at the highly doped BDD anode plays a significant role in the electrochemical oxidation. Finally, the electrochemical removal of dyestuffs was carried out in two types of dyeing baths. The dyeing bath composition has a significant effect on the degradation efficiency. Chlorides in F-type dyeing bath accelerated electrochemical removal due to effective generation of Cl-2/HOCl at the highly B-doped BDD anode. In contrast, OH- inhibited the D-type dyestuff removal from dyeing bath, because they acted as scavengers of (bold)/boldOH radicals. Highly B-doped BDD anode is promising material to F-type dyestuff treatment in industrial wastewater.
机译：在该研究中，在流量反应器中研究了五种偶氮染料的电化学氧化（黄色D-5GN，红色D-B8，Ruby F-2b，蓝色D-5RN，黑DN），在流动反应器中研究。制备并使用具有高硼掺杂水平（C / B = 10000）的BDD电极。考虑了两种反应器的构态，即用未分割的细胞，另一个用细胞除以阳极和阴极隔室。研究了电流密度和溶液对染料染料降解过程的初始pH的影响。正如预期的那样，发现较高的电流密度较高的降解率，而pH的效果是边缘的。接下来，研究了用不同化学结构的偶氮染料的电化学氧化。基于循环伏安法测量，发现了染料去除率与染料的氧化潜在值之间的相关性。这些结果表明，高掺杂的BDD阳极在高掺杂BDD阳极的直接氧化在电化学氧化中起着重要作用。最后，在两种类型的染色浴中进行染料的电化学除去。染色浴组合物对降解效率具有显着影响。 F型染色浴中的氯化物加速了电化学除去由于高B掺杂BDD阳极的Cl-2 / Hocl的有效产生。相比之下，OH-抑制从染色浴中去除的D型染料，因为它们用作（＆粗体＆）的清除剂。高度B掺杂的BDD阳极是工业废水中F型染料处理的有希望的材料。

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