School of Environment, Beijing Key Laboratory for Emerging Organic Contaminants Control, State Key Joint Laboratory of Environmental Simulation and Pollution Control, Tsinghua University, Beijing, 100084, China.
School of Environment, Beijing Key Laboratory for Emerging Organic Contaminants Control, State Key Joint Laboratory of Environmental Simulation and Pollution Control, Tsinghua University, Beijing, 100084, China; Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan, 650500, China.
Water Res. 2015 Sep 1;80:20-9. doi: 10.1016/j.watres.2015.05.024. Epub 2015 May 14.
Electro-peroxone (E-peroxone) is a novel electrocatalytic ozonation process that combines ozonation and electrolysis process to enhance pollutant degradation during water and wastewater treatment. This enhancement has been mainly attributed to several mechanisms that increase O3 transformation to ·OH in the E-peroxone system, e.g., electro-generation of H2O2 from O2 at a carbon-based cathode and its subsequent peroxone reaction with O3 to ·OH, electro-reduction of O3 to ·OH at the cathode, and O3 decomposition to ·OH at high local pH near the cathode. To get more insight how these mechanisms contribute respectively to the enhancement, this study investigated total organic carbon (TOC) elimination from oxalic acid (OA) solutions by the E-peroxone process. Results show that the E-peroxone process significantly increased TOC elimination rate by 10.2-12.5 times compared with the linear addition of the individual rates of corresponding ozonation and electrolysis process. Kinetic analyses reveal that the electrochemically-driven peroxone reaction is the most important mechanism for the enhanced TOC elimination rate, while the other mechanisms contribute minor to the enhancement by a factor of 1.6-2.5. The results indicate that proper selection of electrodes that can effectively produce H2O2 at the cathode is critical to maximize TOC elimination in the E-peroxone process.
电过氧（E-peroxone）是一种新颖的电催化臭氧氧化工艺，它将臭氧氧化和电解过程结合起来，以增强水和废水处理过程中污染物的降解。这种增强主要归因于几种机制，这些机制增加了 E-peroxone 系统中 O3 向·OH 的转化，例如，在碳基阴极上从 O2 电生成 H2O2，随后与 O3 进行过氧反应生成·OH，在阴极上电还原 O3 生成·OH，以及在阴极附近的高局部 pH 下 O3 分解生成·OH。为了更深入地了解这些机制各自对增强的贡献，本研究通过 E-peroxone 过程研究了从草酸（OA）溶液中去除总有机碳（TOC）。结果表明，与相应的单独臭氧氧化和电解过程的速率线性相加相比，E-peroxone 过程显著提高了 TOC 去除率 10.2-12.5 倍。动力学分析表明，电驱动的过氧反应是提高 TOC 去除率的最重要机制，而其他机制的贡献较小，增强倍数为 1.6-2.5。结果表明，选择能够在阴极有效产生 H2O2 的电极对于在 E-peroxone 过程中最大限度地去除 TOC 是至关重要的。
