Applied Catalysis B: Environment and Energy, 15 March, 2025, DOI：https://doi.org/10.1016/j.apcatb.2025.125256

Synergistic optimization of electron layout at spatially adjacent dual-atom sites promotes regeneration of nanozymes and deep removal of paracetamol

Xin-Xin Lv, Xing Chen, Yao Liu, Hui-Lai Liu, Li-Zeng Gao

Abstract

Peroxidase-like (POD-like) represent a promising alternative for the heterogeneous catalytic degradation of pollutants, given their high catalytic activity. Nevertheless, it remains a significant challenge to optimize the performance of POD-like by precise modulation of the active site. In this study, a FeMn-N₆ dual-atom nanozyme (FeMn-DSAzyme) with adjacent active sites was constructed. This strategy effectively optimizes the charge distribution in the centers of adjacent Fe-Mn dual-atom and reduces the potential of Fe atoms through a strong electronic coupling mechanism. Concurrently, the synergistic effect between Fe-Mn dual atoms brings the d-band centre of Fe closer to the Fermi energy level, which enhances the activation of H₂O₂ and promotes the efficient generation of ·OH. As a result, paracetamol (PCM) was effectively removed within the FeMn-DSAzyme/H₂O₂ system. Moreover, the charge-directed flow between Fe-Mn facilitated the active regeneration of the nanozyme. Consequently, the FeMn-DSAzyme/H₂O₂ system demonstrated noteworthy anti-interference characteristics and cyclic stability. A continuous flow reaction device for wastewater purification was subsequently developed to achieve stable and efficient removal of pollutants. This study breaks through the catalytic limitations of single-site catalysts, overcomes the challenge of nanozymes regeneration, and providing valuable insights into the regulation of dual-atom nanozymes activities and their application in pollutant control.

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