Abstract
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 × 104 kJ kg TOC−1 while the constant potential method reached 73.4% at −0.5 V and corresponding energy consumption was 1.54 × 104 kJ kg TOC−1.
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