Xie Jiangzhou, Zhang Changyong, Waite T David
UNSW Water Research Centre, School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW 2052, Australia.
UNSW Water Research Centre, School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW 2052, Australia; CAS Key Laboratory of Urban Pollutant Conversion, Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei, 230026, China.
Water Res. 2022 Jun 15;217:118425. doi: 10.1016/j.watres.2022.118425. Epub 2022 Apr 8.
Anodic oxidation has emerged as a promising treatment technology for the removal of a broad range of organic pollutants from wastewaters. Hydroxyl radicals are the primary species generated in anodic oxidation systems to oxidize organics. In this review, the methods of identifying hydroxyl radicals and the existing debates and misunderstandings regarding the validity of experimental results are discussed. Consideration is given to the methods of quantification of hydroxyl radicals in anodic oxidation systems with particular attention to approaches used to compare the electrochemical performance of different anodes. In addition, we describe recent progress in understanding the mechanisms of hydroxyl radical generation at the surface of most commonly used anodes and the utilization of hydroxyl radical in typical electrochemical reactors. This review shows that the key challenges facing anodic oxidation technology are related to i) the elimination of mistakes in identifying hydroxyl radicals, ii) the establishment of an effective hydroxyl radical quantification method, iii) the development of cost effective anode materials with high corrosion resistance and high electrochemical activity and iv) the optimization of electrochemical reactor design to maximise the utilization efficiency of hydroxyl radicals.
阳极氧化已成为一种很有前景的处理技术，用于去除废水中的多种有机污染物。羟基自由基是阳极氧化系统中氧化有机物的主要物种。在这篇综述中，讨论了识别羟基自由基的方法以及关于实验结果有效性的现有争论和误解。考虑了阳极氧化系统中羟基自由基的定量方法，特别关注用于比较不同阳极电化学性能的方法。此外，我们描述了在理解最常用阳极表面羟基自由基生成机制以及典型电化学反应器中羟基自由基利用方面的最新进展。这篇综述表明，阳极氧化技术面临的关键挑战与以下方面有关：i）消除识别羟基自由基时的错误；ii）建立有效的羟基自由基定量方法；iii）开发具有高耐腐蚀性和高电化学活性的经济高效阳极材料；iv）优化电化学反应器设计以最大限度提高羟基自由基的利用效率。
