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 Fe3O4-MnO2 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 MnO2 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)-O-center dot and SO4 center dot- contribute to CBZ degradation, but SO4 center dot- 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.

Automated summary

The study successfully prepared a catalyst for the degradation of carbamazepine by loading cobalt-based metal organic framework nanoparticles onto a composite material, demonstrating significant potential in water treatment.