Abstract
The present study aims to fabricate heterogeneous electro-Fenton (HEF) cathode catalysts for the in-situ generation of H2O2 and the degradation of organic pollutants in water. To achieve this, preparation of Fe and N co-doped MXene composites (FeCN/MXene-x, where x represents the loading content of FeCN) and construction of the HEF system for the degradation of sulfathiazole (STZ) were carried out. The characterization results showed that Fe, C and N mainly existed in the form of Fe3C and Fe3N in the FeCN/MXene catalysts, which were favorable for promoting the ORR reaction in the HEF system. Among them, FeCN/MXene-2 exhibited the highest redox electron transfer rate and H2O2 selectivity (86%). The catalytic oxidation mechanism of the FeCN/MXene-2/HEF system was investigated by free radical quenching, electron paramagnetic resonance and frontier orbital theory studies. These studies demonstrated that the main active substances for the degradation of SDZ were ·OH and 1O2. In addition, the excellent stability and practical performance of the prepared cathodic catalysts were demonstrated by cycling experiments and real water sample tests.
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