A dual-MOFs (Fe and Co)/g-C3N4 heterostructure composite for high-efficiently activating peroxymonosulfate in degradation of sertraline in water

• A state dual-MOFs composite was firstly synthesized by MIL-100(Fe) and ZIF-67/g-C 3 N 4 . • MOF-Fe nanoparticles/MOF-Co-based/g-C 3 N 4 showed excellent catalytic activity. • The composites, their micropores and heterojunction promoted to the high property. • Theoretical calculation and HPLC-MS/MS analysis inferred SER’s degradation pathways. A dual-MOFs (Fe and Co)/g-C 3 N 4 heterojunction composite was successful constructed and used to activate peroxymonosulfate (PMS) for degrading sertraline (SER). The composite showed outstanding catalytic activity with 100% of SER removal efficiency in 60 min and the degradation rate 0.057 min -1 . At the same time, the amount of catalyst, concentration of PMS and environmental pH on the degradation for SER were investigated in detail. The main degradation products and pathways of SER were analyzed by Gaussian theory calculation and high-performance liquid chromatography-mass spectrometry (HPLC-MS). Based on the free radical quenching experiments and electron paramagnetic resonance (EPR) characterization analysis, it was confirmed that •OH and SO 4 •- were produced in the catalytic reaction process, and explained catalytic mechanism elaborately. This work demonstrates the connection of MOF-Fe nanoparticles, micropores and heterojunction with the catalytic activity, providing an efficient catalytic system that can promote electron transfer and circulation of high activity center.