Is single-atom catalyzed peroxymonosulfate activation better?Coupling with metal oxide may be better
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 effi-ciency.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 degrada-tion.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 be-tween 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 activa-tion energy.Co3O4@Co1/C3Ns also exhibits excellent reusability and can be employed in broad ap-plication scenarios.
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