Diatomite-templated synthesis of single-atom iron on nitrogen-doped carbon for efficient oxidation treatment of wastewater
Date
2025
Authors
Yao, Y.
Ma, Z.
Tao, Z.
Song, X.
Wang, J.
Liu, Y.
Wang, S.
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Advisors
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Journal article
Citation
Chemical Engineering Science (CES), 2025; 305:121127-1-121127-13
Statement of Responsibility
Yunjin Yao, Ziwei Ma, Zhongming Tao, Xueyi Song, Jingyi Wang, Yating Liu, Shaobin Wang
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Abstract
Single-atom catalysts (SACs) have shown promise for effectively removing organic contaminants, yet their rational design remains challenging. In this study, we present single-atomic iron-decorated three-dimensional nitrogen-doped carbon catalysts (3DFe-N-C) synthesized via a diatomite-templated method for peroxymonosulfate (PMS) activation and degradation of persistent organic pollutants. The unique hierarchical structure of 3DFe-N-C provides abundant active sites and high electron conductivity, resulting in superior reaction kinetics and stability, outperforming most reported iron-based catalysts and Fe2+ homogeneous systems. Characterization studies indicated that surface electron transport is the primary degradation pathway, alongside radical reactions (SO(· –)(4) and HO(⋅) ). Mechanistic investigations revealed that enhanced chemisorption and electron transfer between PMS and 3DFe-N-C facilitate an inner electron shuttle mechanism, with Fe-N(x) sites acting as conductive bridges that lower the energy barrier for the formation of the 3DFe-N-C-PMS* intermediate. This work provides new strategies for designing advanced carbon-based materials for PMS activation, contributing to effective environmental remediation.
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