Cobalt-based metal-organic framework for antibiotic elimination by activating peroxymonosulfate in aqueous solution

The novel heterogeneous catalyst based on transition metal ([Co7(BTB)4(DPE)2·DMF]·DMF·H2O, CUST-564) was successfully obtained by solvent thermal method and applied for peroxymonosulfate (PMS) activation to eliminate the tetracycline (TC) in aqueous solution. The aimed Co-MOF sample was characterized by XRD, FTIR, TGA and XPS, certified that CUST-564 was synthesized successfully. The crystal structure of CUST-564 was collected and analyzed to realize the bonding situation and composition. The CUST-564/PMS/TC system played the excellent degradation rate compared to PMS/TC and CUST-564/TC systems. The influence factors for PMS activation such as CUST-564 dosages, TC concentration, PMS concentration, different temperature conditions, initial pH and co-existing anions were investigated. Quenching experiments demonstrated that free radical pathway dominated the TC degradation process. Cycle experiments were conducted for three times to examine the stability of CUST-564. These results proved that CUST-564 could be a potential PMS activation catalyst for TC elimination.