Co-MoS2@BC catalyzed ultrafast degradation of tetracycline by peroxymonosulfate: Domination of non-radical pathway based on 1O2

Abstract

Co-MoS₂@BC catalysts were prepared using pine cones as biochar source, and the surface morphology and microstructure of the catalysts were analyzed and the successful preparation of the materials was verified by adopting the characterization means such as BET, SEM, XRD, FTIR, TEM, XPS, Raman. At the concentration of tetracycline (TC) in water of 20 mg/L, the reaction system with catalyst participation resulted in 98.88 % pollutant removal and efficient degradation, and the effects of TC concentration, coexisting chemicals, initial pH, catalyst dosage, PMS dosage, and other factors on the catalytic performance of Co-MoS₂@BC were investigated. The results of quenching experiments and electron paramagnetic resonance (EPR) examinations were combined, the reactive substances whose main roles in the reaction process were identified as single linear oxygen (¹O₂), and the simultaneous presence of electron transfer-mediated non-radical pathways in the Co-MoS₂@BC/PMS/TC system was confirmed using Linear sweep voltammetry (LSV). The reaction process's intermediates were examined using liquid chromatography-mass spectrometry (LC-MS), which also offered potential degradation routes.