Abstract
Different transition metal single-atoms may lead to a variety of reaction mechanisms in advanced oxidation processes (AOPs). The transition metal (Fe, Ni and Mn) single-atom C2N3 catalysts were used to degrade acetaminophen (AP) by activating periodate (PI). Mn-CN+PI system can completely remove AP in 2 min, and its rate constant (5.7550 min−1) was 9.37 and 22.69 times higher than that of Ni-CN+PI and Fe-CN+PI. The system showed excellent performance in different influencing factors and micropollutant removal experiments. The recyclable Mn-CN sponge sheet showed good practical application performance in microreactor experiments. Electron paramagnetic resonance, radical quenching, electrochemical experiments, combined with theoretical simulation certified that Mn-CN+PI system was dominated by electron transfer mechanism, which was superior to reactive oxygen species that dominated Ni-CN+PI and Fe-CN+PI systems. The electron transfer-mediated pollutant degradation provides insights into PI-based AOPs, and offers a feasible pathway for micropollutant degradation.
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