Degradation of Cobalt-doped Manganese Dioxide(Co-MnO2)-like Oxidative Enzymes of Methylene Blue
Nanozymes,as an emerging catalytic oxidant,have garnered widespread attention in the fields of water treatment due to their low cost and consumption.The introduction of transition metals into nanozymes effectively boosts their catalytic activity,promoting the degradation of organic pollutants by manganese-based materials.In this study,a one-step hydrother-mal method was employed to effectively dope Co elements onto the surface of MnO2,forming highly active nanostructured oxides.The morphology and chemical composition of Co-MnO2 were analyzed by characterization techniques such as X-ray photoelectron spectroscopy(XPS),scanning electron microscopy(SEM),and X-ray diffraction(XRD),and further investiga-tion was conducted on its degradation performance towards organic pollutants(methylene blue).The results indicate that the doping of Co enhances the activity of Co-MnO2 nanozymes.At a methylene blue concentration of 20 mg/L and a Co-MnO2 dosage of 0.5 g/L,the degradation efficiency of methylene blue reached over 90％within 60-90 minutes.Additionally,Co-MnO2 exhibited excellent resistance to environmental interference.Free radical capture experiments and Electron Paramagnetic Resonance(EPR)analysis also demonstrated that Co-MnO2 nanozymes efficiently utilize dissolved oxygen to produce large amounts of 1O2 and O2.-species for the rapid degradation of methylene blue.This study provides new insights into the degradation of organic pollutants by nanozymes.
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维普
