Synthesis of A-position Ba-doped Perovskite LaCoO3 and Performance of Photocatalytic Phenol Degradation
The utilization of perovskite oxide materials as catalysts for the photodegradation of organic pollutants in water is a promising and rapidly advancing field.In this study,a series of La1-xBaxCoO3(x=0.2,0.3,0.4,0.5,0.6)catalysts with varying Ba doping ratios were synthesized using the citric acid complexation-hydrothermal synthesis combined method for the degradation of phenol under visible light irradiation.Among the synthesized catalysts,La0.5Ba0.5CoO3 exhibited the highest photocatalytic activity.In addition,the photocatalytic mechanism for La0.5Ba0.5CoO3 perovskite degradation of phenol was also discussed.The synthesized catalysts were characterized using XRD,SEM,FT-IR,XPS,MPMS and other characterization techniques.The results revealed that the diffraction peak intensity of La1-xBaxCoO3 increased with higher Ba doping ratios,and the La0.4Ba0.6CoO3 exhibited the strongest diffraction peaks.The catalyst particle sizes ranged from 10 to 50 nm,and the specific surface area decreased with increasing Ba content.Additionally,the paramagnetic properties of La0.5Ba0.5CoO3 were similar to that of La0.4Ba0.6CoO3.The experimental results suggested that the incorporation of Ba could significantly improve the catalytic performance of La1-xBaxCoO3 perovskites,promote electron transfer and favor to the generation of hydroxyl radicals(·OH),leading to the efficiently degradation of phenol.
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