Single-atom co sites confined in layered double hydroxide for selective generation of surface-bound radicals via peroxymonosulfate activation
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(Published version)
Date
2024
Authors
Chen, C.
Yan, M.
Li, Y.
Hu, Y.
Chen, J.
Wang, S.
Wu, X.L.
Duan, X.
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Journal article
Citation
Applied Catalysis B: Environmental, 2024; 340:123218-1-123218-10
Statement of Responsibility
Chaofa Chen, Minjia Yan, Yu Li, Yuwen Hu, Jianrong Chen, Shaobin Wang, Xi-Lin Wu, Xiaoguang Duan
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Abstract
Selective production of specific radical species with prolonged lifetime is challenging in advanced oxidation process. Herein, we constructed single-atom Co (SA-Co) catalytic sites confined in layered double hydroxide (LDH) for selectively and sustainably generate radical species via peroxymonosulfate (PMS) activation. The negatively charged PMS was stabilized by the positively charged LDH and simultaneously activated by the nanoconfined Co single-atom sites, resulting in oriented-production of surface-bonded •OH and SO4•− radicals with long-term efficiency (up to 48 h), suppressed PMS decomposition and radical self-quenching. Ion competition experiments and in-situ spectroscopic studies were applied to monitor the PMS activation processes. The SA-Co-LDH/PMS system outperforms the benchmark homogeneous (Co2+/PMS) and heterogeneous (Co3O4/PMS) catalytic systems for the degradation of emerging organic contaminants (EOCs) with the lowest Co consumption and highest catalytic efficiency.
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Available online 25 August 2023
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© 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/bync-nd/4.0/).