Active Edge Sites Engineering on Amorphous Co–Mn Spinel‐Based Oxides for Efficient Peroxymonosulfate Activation

Abstract Rational modulation of edge active sites in the Fenton‐like reaction, utilizing defect engineering to form efficient catalytic activity centers, is a hot topic in the heterogeneous catalysis field, yet the applicability of large‐scale manufacturing remains a severe challenge. Herein, a general wet‐chemical approach is reported to large‐scale prepare porous CoMn 2 O 4 with abundant active edge sites for enhanced peroxymonosulfate (PMS)‐based Fenton‐like activation without using a template or heat treatment. The obtained Turing‐type structure not only can be assembled into spatially restricted domain CoMn 2 O 4 nanoreactors but also greatly facilitates the exposure of active edge sites with oxygen‐rich vacancies in promoting PMS adsorption and interfacial charge transfer. The unique CoMn 2 O 4 /PMS system exhibited efficient and stable removal of organic pollutants with dominant nonradical ( 1 O 2 ) pathways and maintained a degradation rate of 99.8% within 5 min after seven‐cycle runs. Moreover, the application prospect of the PMS‐based Fenton‐like process for large‐scale wastewater treatment, including sulfadiazine (SD) antibiotics in real river water and real pharmaceutical wastewater, was demonstrated by the fixed‐bed tower reactor and the in‐situ floating water treatment device. This work will provide guidance for the development of low‐cost and efficient heterogeneous PMS‐activation catalysts through rational defect engineering.