Double-potential electro-Fenton: A novel strategy coupling oxygen reduction reaction and Fe2+/Fe3+ recycling

作者：Liang, Jiaxiang; Zhang, Yun; Song, Chencheng; Tang, Diyong; Sun, Jie^*

来源：Electrochemistry Communications, 2018, 94: 55-58.

DOI：10.1016/j.elecom.2018.08.006

• Electro-Fenton
• H2O2 generation
• Fe3+ reduction
• DMP mineralization

In general, the electro-Fenton degradation potential is set according to the optimal H2O2 generation potential without considering Fe2+/Fe3+ electrocatalytic recycling, resulting in high-energy consumption and iron sludge. In this work, a novel double-potential strategy was provided by alternately applying the optimal H2O2 generation potential and Fe2+/Fe3+ recycling potential during the degradation process. The double-potential method showed a coordination of in-situ H2O2 generation by oxygen reduction reaction (ORR) and Fe2+/Fe3+ recycling. EPR detection indicated that more hydroxyl radicals were produced during the double-potential process compared with the one achieved by constant potential. An outstanding DMP mineralization rate of 94.0% was achieved within 30 min and corresponding energy consumption was 0.762 x 10(4) kJ kg TOC-1 while the constant potential method reached 73.4% at -0.5 V and corresponding energy consumption was 1.54 x 10(4) kJ kg TOC-1.

• 出版日期2018-9
• 单位中南民族大学