Efficient bimetallic metal–organic framework derived magnetic Co/N-PC-800 nanoreactor for peroxymonosulfate activation and carbamazepine degradation†

Abstract

Co/N-PC-T precursors were obtained in this study using solvent heating and immersion methods. Subsequently, simple pot calcination of Co@Zn-MOF (metal–organic framework) and dicyandiamide green precursors was carried out to prepare N-doped magnetic carbon materials, known as Co/N-PC-T. Co/N-PC-T were employed to activate peroxymonosulfate (PMS) and degrade developing pollutants. The Co/N-PC-800 catalyst exhibited excellent catalytic activity. When Co/N-PC-800 was used for PMS activation, carbamazepine (CBZ) degradation could exceed 98% within 30 min, with a degradation rate of 0.23 min⁻¹, which was 4.77, 5.73, and 1.28 times higher than that of Co/N-PC-600 (0.05 min⁻¹), Co/N-PC-700 (0.04 min⁻¹), and Co/N-PC-900 (0.18 min⁻¹), respectively. The Co/N-PC-800/PMS system contained radical and non-radical pathways, which were further confirmed by electron paramagnetic resonance (EPR) tests, and the corresponding catalytic reaction mechanisms were proposed. The breakdown pathways of CBZ in the Co/N-PC-800/PMS system were described, and the ecotoxicity of CBZ and its degradation by-products was assessed. After five cycles, Co/N-PC-800 was shown to be stable and recyclable. This study proposes a novel synthetic technique for developing MOF-derived environmental functional materials.