Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 287, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2021.119963
Keywords
Enteromorpha; Single atom sites; High-Valence iron; Peroxymonosulfate; Nonradical oxidation
Funding
- Tai Shan Scholar Foundation [ts201511003]
- Young Scholars Program of Shandong University [2018WLJH52]
- Pawsey Supercomputing Centre [pawsey0344]
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Enteromorpha, a seawater pollutant, was converted into a functional carbocatalyst for Fenton-like reactions. The Enteromorpha-derived Fe-N-C exhibited high activity in activating peroxymonosulfate for organic pollutant degradation. Single Fe atoms played a crucial role as dominant reactive sites in forming highly oxidizing Fe-IV=O and Fe-V=O species.
Enteromorpha as a seawater pollutant was innovatively converted into a functional carbocatalyst to driven Fenton-like reactions. After direct pyrolysis of Enteromorpha at 900 degrees 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 Fe-IV=O and Fe-V=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.
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