Efficient cobalt-based metal-organic framework derived magnetic Co@C-600 Nanoreactor for peroxymonosulfate activation and oxytetracycline degradation

Abstract

A magnetic carbon material Co@C-600 was fabricated by the in situ thermal conversion of a precursor metal organic frameworks (CUST-563) with structure for peroxymonosulfate (PMS) activation. The composition of the material changes regularly by carbonizing the precursor at different temperatures. The Cobalt-based carbon materials with well dispersibility were obtained by carbonizing MOF, which avoided aggregation and exposed more active sites. The reaction parameters (catalyst content, PMS dosage, temperature, pH value, etc.) in the oxytetracycline (OTC) degradation process had been investigated. The degradation rate of OTC (20 mg/L) in 15 min reached more than 89%. According to the electron paramagnetic resonance (EPR) test results, the degradation process was carried out by the synergistic effect of two degradation mechanisms: free radicals (SO4·-,·OH) and non-radicals (1O2) process, and Co0 acts as the initiator of the free radical reaction. It proved that the synthesized efficient nanocarbon-based Co@C-600 was equipped with highly stability and reusability after 10 cycles experiments. This work studied the difference in the crystal at composition after calcining crystal at various temperatures and the mechanism of activation of PMS, which provided a design idea about the preparation of high-efficiency catalytic materials.