Activating peroxymonosulfate with Co/Ce bimetallic metal-organic frameworks: structural stability and enhanced dye degradation

A series of bimetallic Co/Ce-MOFs materials (Co/Ce-MOFs-NH 2 ) were synthesized via a solvothermal method, and their catalytic performance in peroxymonosulfate (PMS) activation for the degradation of Rhodamine B (RhB) was systematically investigated. The results demonstrate that the 3:1 Co/Ce-MOFs-NH 2 not only retains high catalytic activity but also exhibits significantly enhanced structural stability due to the introduction of Ce 3+ . Over 99 % of RhB was degraded within 3 min, and the material maintained 92.3 % of its initial activity after five consecutive cycles. Mechanistic studies revealed that · OH and singlet oxygen ( 1 O 2 ) serves as the dominant reactive oxygen species, while the synergistic redox cycles of Co 2+ /Co 3+ and Ce 3+ /Ce 4+ effectively promote the continuous activation of PMS. This study provides a novel strategy for designing highly efficient and stable bimetallic Metal-Organic Frameworks(MOFs) catalysts.