当前位置: X-MOL 学术Front. Environ. Sci. Eng. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Characterization of electrode fouling during electrochemical oxidation of phenolic pollutant
Frontiers of Environmental Science & Engineering ( IF 6.4 ) Pub Date : 2020-10-09 , DOI: 10.1007/s11783-020-1345-7
Xuefeng Liu , Shijie You , Fang Ma , Hao Zhou

Electrode fouling is a problem that commonly occurs during electro-oxidation water purification. This study focused on identifying the fouling behavior of Pt electrode associated with the formation of polymeric layer during electro-oxidation of phenol. The in situ electrochemical measurements and non-destructive observation of the electrode morphology were reported. The results demonstrated that the electrode fouling was highly dependent on thermodynamic process of electrode that was controlled by anode potential. At anode potential lower than 1.0 V vs SHE, the direct electro-oxidation caused the electrode fouling by the formation of polymeric film. The fouling layer decreased the electrochemically active surface area from 8.38 cm2 to 1.57 cm2, indicated by the formation of polymeric film with thickness of 2.3 µm, increase in mass growing at a rate of 3.26 µg/cm/min. The degree to which the anode was fouled was independent of anion in the electrolyte. In comparison, at anode potential higher than 2.7 V vs SHE, the anions (e.g., chloride) could exert a major influence to the behavior of electrode fouling. The presence of chloride was shown to mitigate the fouling of electrode significantly through preventing the formation of polymeric film by active chlorine (e.g., Cl• and Cl2) produced from anodic oxidation of chloride. Since chloride is the most abundant anionic species existing in both natural and engineered water system, this study not only offers a deep insight into the mechanism of electrode fouling, but also suggests strategies for anti-fouling in the presence of chloride in electro-oxidation process.



中文翻译:

酚类污染物电化学氧化过程中电极结垢的表征

电极结垢是在电氧化水净化过程中经常发生的问题。这项研究的重点是确定苯酚电氧化过程中与聚合物层形成有关的Pt电极结垢行为。报告了电极形态的原位电化学测量和无损观察。结果表明,电极结垢高度依赖于由阳极电势控制的电极热力学过程。在阳极电势低于SHE的1.0 V时,直接电氧化会通过形成聚合物膜而导致电极结垢。污垢层将电化学活性表面积从8.38 cm 2减少到1.57 cm 2通过形成厚度为2.3 µm的聚合物膜可以看出,以3.26 µg / cm / min的速度增长的质量增加。阳极结垢的程度与电解质中的阴离子无关。相比之下,在高于SHE的2.7 V阳极电势下,阴离子(例如氯离子)可能对电极结垢的行为产生重大影响。通过防止活性氯(例如Cl•和Cl 2)形成聚合物膜,氯化物的存在可显着减轻电极结垢。)由氯化物的阳极氧化产生。由于氯化物是天然水和工程用水系统中存在的最丰富的阴离子物质,因此该研究不仅可以深入了解电极结垢的机理,而且还提出了在电氧化过程中存在氯化物时的防结垢策略。 。

更新日期:2020-10-15
down
wechat
bug