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

Authors :
Jielei Fan
Ruoxue Wang
Xiaodong Zheng
Hancheng Jiang
Xiuli Hu
Source :
Molecules, Vol 29, Iss 15, p 3508 (2024)
Publication Year :
2024
Publisher :
MDPI AG, 2024.

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.

Details

Language :
English
ISSN :
14203049
Volume :
29
Issue :
15
Database :
Directory of Open Access Journals
Journal :
Molecules
Publication Type :
Academic Journal
Accession number :
edsdoj.6b6f121ddf2b4965ba8115e8e82efc44
Document Type :
article
Full Text :
https://doi.org/10.3390/molecules29153508