ZIF-67 Loaded on Fe3O4-MnO2 as Efficient Peroxymonosulfate Activator for Rapid Degradation of Carbamazepine

Poor sorption capacity and low biodegradability of carbamazepine (CBZ) lead to the difficulties in CBZ removal from water. Sulfate radical-based advanced oxidation process shows great potential for organic pollutant removal. Metal organic frameworks (MOFs) demonstrate great potential in catalytic field due to their excellent properties. Hence, cobalt-based metal organic framework (ZIF-67) nanoparticles are loaded on Fe 3 O 4 -MnO 2 composite, and then this composite is applied as peroxymonosulfate (PMS) activator for CBZ degradation. The prepared catalyst exhibits excellent catalytic performance because of the central metal cobalt of ZIF-67 and the synergistic effect between MnO 2 and ZIF-67. 81% of CBZ with a high initial concentration of 20 mg L −1 is rapidly removed from water within 2.5 min. The prepared catalyst can be convenient to recycle under magnetic field while maintaining its high catalytic stability. Degradation mechanism analysis indicates that both • OH and SO 4 •− contribute to CBZ degradation, but SO 4 •− is the main radical species. XPS spectra reveal that Co(II)/Co(III), Mn(II)/Mn(III)/Mn(IV), and Fe(II)/Fe(III) are involved in PMS activation. The degradation pathway is put forward based on the detection of intermediates. This study provides a new inspiration for the fabrication of magnetic metal oxide-MOFs catalysts with outstanding recycling performance for PMS activation.