Enhanced Heterogeneous Catalytic Activity of Peroxymonosulfate for Rhodamine B Degradation via a Co-Based Metal-Organic Framework.

A stable metal-organic framework with the formula {[Co(BBZB)(IPA)]·HO} (, BBZB = 4,7-bis(1-benzimidazole-1-yl)-2,1,3-benzothiadiazole and HIPA = isophthalic acid) was constructed by incorporating Co ions and two conjugated ligands under solvothermal conditions. takes a dinuclear cluster-based layer structure with a porosity of 2.7%. In this work, was used to activate peroxymonosulfate (PMS) to degrade rhodamine B (RhB), a difficult-to-degrade pollutant in water. Compared with pure PMS or , the /PMS system displays the best degradation ability of RhB in neutral solution. When the mass ratio of to PMS was 2:3, 99.72% of RhB (50 ppm) was removed within 60 min, and the reaction rate was 0.1 min. Furthermore, free radical quenching experiments show that SO was the main free radical during the process of RhB degradation. In addition, exhibits good reusability for the degradation of the organic dye RhB, making it a potential candidate for environmental remediation.