A Dual-Site Functional MOF Engineered for Effective Degradation of Polycyclic Aromatic Hydrocarbons Through...

Metal single-atom catalysts have emerged as promising candidates for advanced oxidation processes (AOPs) in environmental pollutant removal, yet their practical deployment is often hindered by rapid oxidant consumption. Herein, we design and construct a bifunctional MOF-derived catalyst integrating Co single-atom sites (Co-SAs) and N-doped Co₃O₄ nanoparticles (NPs), which synergistically lowers oxidant demand, enhances environmental adaptability, and operates under milder conditions. Mechanistic investigations reveal that the Co-SAs act as indispensable active sites for the activation of peroxydisulfate (PDS), driving the efficient degradation of polycyclic aromatic hydrocarbons (PAHs). In the PAHs/PDS/Co-SAs/NPs degradation system, singlet oxygen constitutes the dominant reactive species, underpinning remarkable catalyst recyclability, acid-base stability, and practical potential. Furthermore, the N-doped Co₃O₄ NPs facilitate the conversion of sulfate radicals to the photo-induced regeneration of PDS; thereby achieving reduced consumption of peroxydisulfate during the degradation process. In summary, this work demonstrates an innovative and promising single-atom-catalyst-based strategy for the removal of PAHs and sustainable water purification.