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Research Article

Atomically dispersed hierarchically ordered porous Fe-N-C single-atom nanozymes for dyes degradation

Shuangli Wu1,2Weiwei Wu1,2Xinyang Zhu1,2Minghua Li1,3Jianguo Zhao1,2Shaojun Dong1,2( )
Changchun State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
University of Science and Technology of China, Hefei 230026, China
College of Chemistry, Jilin University, Changchun 130012, China
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Graphical Abstract

we designed and synthesized Fe-N-C single-atom nanozymes (SAzymes) with atomically dispersed FeN4 active sites anchored on a three-dimensional hierarchically ordered microporous-mesoporous-macroporous nitrogen doped carbon matrix (3DOM Fe-N-C). 3DOM Fe-N-C exhibited three kinds of enzyme-mimic activities and could be used for the degradation of a targeted environmental pollutant (rhodamine B (RhB)).

Abstract

The development of novel nanozymes for environmental contamination remediation is a worthwhile research direction. However, most of the reported nanozymes cannot degrade efficiently due to the limitation of the internal active sites not being able to come into direct contact with contaminants. Therefore, we reported Fe-N-C single-atom nanozymes (SAzymes) with atomically dispersed FeN4 active sites anchored on a three-dimensional hierarchically ordered microporous-mesoporous-macroporous nitrogen doped carbon matrix (3DOM Fe-N-C) for the degradation of a targeted environmental pollutant (rhodamine B (RhB)). The three-dimensional (3D) hierarchically ordered porous structure may accelerate mass transfer and improve the accessibility of active sites. This structure and high metal atom utilization endow Fe-N-C SAzyme with enhanced tri-enzyme-mimic activities, comprising oxidase-mimic, peroxidase-mimic, and catalase-mimic activities. Based on its excellent peroxidase-mimic activity, 3DOM Fe-N-C can degrade RhB by hydroxyl radicals (·OH) generated in the presence of hydrogen peroxide. This study provides a new idea for designing porous Fe-N-C SAzymes for environmental contamination remediation.

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Nano Research
Pages 10840-10847
Cite this article:
Wu S, Wu W, Zhu X, et al. Atomically dispersed hierarchically ordered porous Fe-N-C single-atom nanozymes for dyes degradation. Nano Research, 2023, 16(8): 10840-10847. https://doi.org/10.1007/s12274-023-5847-z
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Received: 18 March 2023
Revised: 08 May 2023
Accepted: 19 May 2023
Published: 05 July 2023
© Tsinghua University Press 2023
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