Engineered carbon supported single iron atom sites and iron clusters from Fe-rich Enteromorpha for Fenton-like reactions via nonradical pathways

By L. Peng, Xiaoguang Duan, Ya-nan Shang, Baoyu Gao, Xing Xu. 2021

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Abstract Enteromorpha as a seawater pollutant was innovatively converted into a functional carbocatalyst to driven Fenton-like reactions.After direct pyrolysis of Enteromorpha at 900 °C without additional chemicals, a large number of Fe clusters and single Fe sites are anchored onto N-doped carbon matrixes (Enteromorpha-derived Fe-N-C) with a high Fe loading of 0.84 wt.%. The Enteromorpha-derived Fe-N-C exhibits a high activity in the heterogeneous activation of peroxymonosulfate (PMS) for organic pollutant degradation. Radical quenching experiments and electrochemical analysis tests verify the nonradical oxidation by high-valence iron-oxo species and an electron-transfer pathway. The single Fe atoms, which only accounted for the minority of the Fe species in Fe-N-C, acted as the dominated reactive sites for the formation of highly oxidizing FeIV=O and FeV=O sites. This work unveils the evolution of bio-Fe in Enteromorpha during thermal pyrolysis and the role of the derived Fe-N-C in PMS activation and organic degradation.

Subfields: Renewable Energy, Sustainability and the Environment, Water Science and Technology

View Paper: https://www.semanticscholar.org/paper/d461a5675b79e2a57c270c95af090b01f13bd27f