Chinese Journal of Catalysis ›› 2024, Vol. 59: 137-148.DOI: 10.1016/S1872-2067(24)60009-4

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Is single-atom catalyzed peroxymonosulfate activation better? Coupling with metal oxide may be better

Junlei Zhanga,d, Wencong Liua, Biao Liub, Xiaoguang Duanc, Zhimin Aob,*(), Mingshan Zhua,*()   

  1. aGuangdong Key Laboratory of Environmental Pollution and Health, School of Environment, Jinan University, Guangzhou 511443, Guangdong, China
    bAdvanced Interdisciplinary Institute of Environment and Ecology, Beijing Normal University, Zhuhai 519087, Guangdong, China
    cSchool of Chemical Engineering, The University of Adelaide, Adelaide, SA 5005, Australia
    dSchool of Materials Science and Engineering, State Key Laboratory of Solidification Processing, Atomic Control & Catalysis Engineering Laboratory, Northwestern Polytechnical University, Xi’an 710072, Shaanxi, China
  • Received:2023-12-22 Accepted:2024-02-26 Online:2024-04-18 Published:2024-04-15
  • Contact: *E-mail: zhimin.ao@bnu.edu.cn (Z. Ao); zhumingshan@jnu.edu.cn (M. Zhu).
  • Supported by:
    The National Natural Science Foundation of China(52300218);The National Natural Science Foundation of China(22322604);The National Natural Science Foundation of China(22176041);The Pearl River Talent Recruitment Program of Guangdong Province(2019QN01L148)

Abstract:

Single-atom catalysts (SACs) as a new class of peroxymonosulfate (PMS) activator are still limited by the low metal loading and activity. Here, we introduce a new strategy of interfacial coupling SACs with metal oxides to fine-tune the active single-atom sites and improve the atomic utilization efficiency. Taking Co3O4@Co1/C3N5 as a case, the formation of heterostructures enhanced the activity of outer-sphere SACs for PMS activation, further upgrading the kinetics of diclofenac sodium degradation. The degradation rate of the composite increases by up to approximately 28.0 and 2.5 times compared to Co3O4and Co1/C3N5, respectively. The Co1-O (Co3O4) and Co-N (Co1/C3N5) bonds between Co1/C3N5 and Co3O4 make a tightly coupled interface for charge migration, which synergically optimizes the PMS adsorption configuration toward reactive species generation with lower activation energy. Co3O4@Co1/C3N5 also exhibits excellent reusability and can be employed in broad application scenarios.

Key words: Single-atom catalyst, Metal oxide, Synergy, Peroxymonosulfate activation, Co3O4@Co1/C3N5