等离子体辅助制备的 Co₃O₄光催化甲苯净化性能研究

Plasma modification is an effective way to improve the catalytic activities of materials.Firstly,Co₂(OH)₂CO₃ precursor was synthesized by a hydrothermal method.Then,the precursor was subjected to the oxygen atmosphere low-temperature plasma, and the surface modified Co₃O₄ catalyst (Co₃O₄-P) was obtained,which was further characterized the XRD,SEM,H₂-TPR,O₂-TPD,TEM,XPS,FTIR,Raman spectrum and UV-visible spectrum.The results demonstrate that plasma treatment could reduce the average valence state of Co elements in Co₃O₄ to form more defective sites on the catalyst surface,and lower the Co-O bond energy of Co₃O₄ to improve its low temperature reduction performance. Under the irradiation of full solar spectrum light with intensity of 776 mW/cm², reaction space velocity of 30 000 mL/（g·h）and toluene concentration of 500 μg/g，the toluene degradation performance of the Co₃O₄-P catalyst could reach 100.0%，which was approximately twice that of the Co₃O₄ catalyst (Co₃O₄-T) prepared by thermal calcination.