Nonradical-dominated peroxymonosulfate activation by FeMn nanoparticles for the degradation of organic pollutants
Mesoporous FeMn nanoparticles(FMNPs)with high catalytic activity and stability were successfully synthesized by a two-step hydrothermal-calcination method.The physicochemical properties,morphology,and structure of FMNPs were analyzed by scanning electron microscopy(SEM),X-ray energy dispersive spectroscopy(EDS),Specific surface and pore size analyzer(BET),Fourier transform infrared spectroscopy(FTIR),and X-ray powder diffractometry(XRD).The synthesized catalysts,featuring abundant mesopores and a large specific surface area,significantly enhanced the catalytic degradation of organic pollutants.To assess the reusability,stability,and adaptability of the catalysts,degradation experiments were conducted with reactive black 5(RBK5)under various conditions.The optimal parameters were established at a pH of 7,a persulfate(PMS)concentration of 2mmol/L,and a catalyst dosage of 0.2g/L,achieving a 96.74%removal of 10mg/L RBK5 within 60 minutes.The catalytic mechanism was investigated through Electron Paramagnetic Resonance(EPR),quenching experiments,and Chronocurrent(i-t)tests,confirming that the non-radical pathway(1O2 and mediated electron transfer)played a dominant role in the degradation process.X-ray photoelectron spectroscopy(XPS)analysis revealed that the synergistic effect between Fe and Mn promoted the redox cycle of Fe3+/Fe2+and Mn2+/Mn3+,accelerating the electron transfer to PMS and thereby boosting the activation efficiency of PMS.
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