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Article

Single-Atom Iron Catalysts with Core-Shell Structure for Peroxymonosulfate Oxidation

by
Jielei Fan
,
Ruoxue Wang
,
Xiaodong Zheng
,
Hancheng Jiang
and
Xiuli Hu
*
Institute of Polymer Science and Engineering, School of Chemical Engineering, Hebei University of Technology, Tianjin 300130, China
*
Author to whom correspondence should be addressed.
Molecules 2024, 29(15), 3508; https://doi.org/10.3390/molecules29153508
Submission received: 3 July 2024 / Revised: 22 July 2024 / Accepted: 24 July 2024 / Published: 26 July 2024
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Abstract

The chemical tolerance of ketoenamine covalent organic frameworks (COFs) is excellent; however, the tight crystal structure and low surface area limit their applications in the field of catalysis. In this work, a porous single-atom iron catalyst (FeSAC) with a core–shell structure and high surface area was synthesized by using Schiff base COF nanospheres as the core and ketoenamine COF nanosheets growth on the surfaces. Surface defects were created using sodium cyanoborohydride etching treatment to increase specific surface area. The dye degradation experiments by peroxymonosulfate (PMS) catalyzed by the FeSAC proved that methylene blue can be degraded with a degradation rate constant of 0.125 min−1 under the conditions of 0.1 g L−1 catalyst dosage and 0.05 g L−1 peroxymonosulfate. The FeSAC/PMS system effectively degrades various pollutants in the pH range of 4–10 with over 80% efficiency for four cycles and can be recovered by soaking in iron salt solution. Free radical quenching experiments confirmed that singlet oxygen and superoxide radicals are the main active species for catalysis.
Keywords: covalent organic framework; peroxymonosulfate; single-atom iron catalyst; porous material; water pollution covalent organic framework; peroxymonosulfate; single-atom iron catalyst; porous material; water pollution

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MDPI and ACS Style

Fan, J.; Wang, R.; Zheng, X.; Jiang, H.; Hu, X. Single-Atom Iron Catalysts with Core-Shell Structure for Peroxymonosulfate Oxidation. Molecules 2024, 29, 3508. https://doi.org/10.3390/molecules29153508

AMA Style

Fan J, Wang R, Zheng X, Jiang H, Hu X. Single-Atom Iron Catalysts with Core-Shell Structure for Peroxymonosulfate Oxidation. Molecules. 2024; 29(15):3508. https://doi.org/10.3390/molecules29153508

Chicago/Turabian Style

Fan, Jielei, Ruoxue Wang, Xiaodong Zheng, Hancheng Jiang, and Xiuli Hu. 2024. "Single-Atom Iron Catalysts with Core-Shell Structure for Peroxymonosulfate Oxidation" Molecules 29, no. 15: 3508. https://doi.org/10.3390/molecules29153508

APA Style

Fan, J., Wang, R., Zheng, X., Jiang, H., & Hu, X. (2024). Single-Atom Iron Catalysts with Core-Shell Structure for Peroxymonosulfate Oxidation. Molecules, 29(15), 3508. https://doi.org/10.3390/molecules29153508

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