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Insight into the performance and mechanism of N,O,S-codoped porous carbon based CO single-atom catalysts in organic oxidation through peroxymonosulfate activation

Chemical Engineering Journal, ISSN: 1385-8947, Vol: 497, Page: 154668
2024
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Article Description

Single-atom catalysts (SACs) are charming for heterogeneous Fenton-like processes due to their unique and adjustable electron structure. Developing novel SACs and elucidating their mechanisms are critical for the development of water purification techniques. Herein, we present an N,O,S-codoped carbon based Co SAC (Co SA -N-C O,S ) synthesized by anchoring isolated Co atoms onto porous carbon derived from low-cost protic salt. This catalyst exhibits significant efficiency in activating peroxymonosulfate (PMS) for rapid ibuprofen (IBU) degradation, achieving approximately 98.2 % within 10 min at a concentration of 0.2 g/L catalyst and 2 mM PMS, under ambient pH and at 30 °C, and demonstrates excellent reusability. Intensive studies reveal that the highly active atomic Co sites are favorable for activating PMS to produce both radical (SO 4 − and OH) and nonradical 1 O 2, while the electron-rich O and S sites contribute to PMS reduction to generate SO 4 − and OH. The Co SA -N-C O,S /PMS system leverages the synergy between radical and nonradical oxidation across multiple active sites, resulting in exceptional resistance to interference and high efficiency in degradation and mineralization of diverse organic pollutants. This study develops a novel single-atom catalyst for wastewater treatment and elucidates the mechanism behind PMS activation by a carbon-based cobalt single atom catalyst.

Bibliographic Details

Xijun Fu; Qingming Zeng; Lu Song; Yuyan Wu; Rongzhong Wang; Qingyi Zeng

Elsevier BV

Chemistry; Environmental Science; Chemical Engineering; Engineering

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