电解耦合臭氧化体系处理酸性废水的氧化效能

doi:10.13208/j.electrochem.210419

摘要/Abstract

摘要：

建立能有效处理酸性废水的臭氧类高级氧化技术（AOPs-O₃）是一个有待解决的难点。已有报道表明,臭氧氧化与电解结合（电解臭氧化,E-O₃）可以有效降解中性溶液中的污染物。本文研究了E-O₃在酸性溶液中降解乙酸（HAc,臭氧惰性物）的效率,发现E-O₃在pH小于3时仍具有较高的氧化效率,如在pH为1.0时处理100 mg·L^-1 乙酸溶液2小时后E-O₃的效率达到52.2%,而相同条件下电解和臭氧氧化的效率分别只有2.2%和3.5%。尽管酸度增加会降低E-O₃的氧化效率,但在pH等于0时其仍有相对较高的氧化效率。芳族化合物苯乙酮在pH等于1.0条件下也能被E-O₃有效地降解并矿化。机理解析表明,溶解臭氧或氧气可以从阴极获得电子,从而产生高活性的氧化物种,如羟基自由基。在预处理了一种实际酸性废水中E-O₃也具有较好的效率。本研究为酸性废水的有效（预）处理提供了一种新方法。

关键词: 电解, 臭氧, 乙酸, 效率, 酸性废水

Abstract:

Establishment of an ozone-based advanced oxidation process (AOPs-O₃) for effective treatment of acid wastewater is an important and difficult task. The process of ozonation coupled with electrolysis (electrolysis-ozonation, E-O₃) has been reported to effectively degrade pollutants in neutral solution. We studied the efficiency of E-O₃ for degradation of acetic acid (HAc, an ozone inert chemical) in acid solution and found that E-O₃ had high oxidative efficiency at pH less than 3. For example, 52.2% of 100 mg·L^-1 HAc could be removed by E-O₃ in 120 min at pH 1.0, but only 2.2% and 3.5% by electrolysis and ozonation, respectively. Although the efficiency of E-O₃ decreased with the increase of acidity of solution, it still remained relatively high even at pH 0. An aromatic compound of acetophenone could also be effectively degraded by E-O₃ at pH 1.0. The results indicate that electrons can transfer from cathode to dissolved ozone or oxygen in acidic solution, thus resulting in generation of reactive species, e.g. hydroxyl radicals. A real acidic wastewater was also effectively pretreated by E-O₃. This study provides a promising AOPs-O₃ for treatment of acid wastewaters.

Key words: electrolysis, ozone, acetic acid, efficiency, acid wastewater

胡泽友, 项丰云, 毛佶强, 丁亚磊, 童少平. 电解耦合臭氧化体系处理酸性废水的氧化效能[J]. 电化学（中英文）, 2022, 28(1): 2104191.

Ze-You Hu, Feng-Yun Xiang, Ji-Qiang Mao, Ya-Lei Ding, Shao-Ping Tong. Oxidative Efficiency of Ozonation Coupled with Electrolysis for Treatment of Acid Wastewater[J]. Journal of Electrochemistry, 2022, 28(1): 2104191.

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链接本文: https://electrochem.xmu.edu.cn/CN/10.13208/j.electrochem.210419

https://electrochem.xmu.edu.cn/CN/Y2022/V28/I1/2104191

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