Hydrothermal Synthesis of LaCoO۳ Perovskite Catalyst and Its Application for the Degradation of Phenol under Visible Light

In this study, a series of LaCoO۳ perovskite catalysts with varying calcination temperatures were synthesized hydrothermally, and their structure, morphology, and optical properties were investigated using X-Ray powder Diffraction (XRD), Scanning Electron Microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), X-ray electron spectroscopy analysis (XPS), Magnetic Property Measurement System (MPMS), and other characterization techniques. Using phenol as the target degradation product, the photocatalytic degradation reaction was carried out in the presence of visible light. In addition, the photocatalytic mechanism of LaCoO۳ perovskite was also discussed. The experimental results showed that the LaCoO۳ perovskite catalyst has been prepared with good crystallization. The particle size of the catalysts ranged from ۱۰ to ۴۰ nm, and the specific surface area decreased with calcination depth. Moreover, all the LaCoO۳ catalysts showed strong paramagnetism, and the particles were regularly agglomerated under the action of magnetic force. LaCoO۳ catalyst (the calcination temperature of ۷۵۰ °C) exhibited high photocatalytic activity. In addition, the study of photocatalytic mechanisms revealed three degradation pathways for degrading phenol into inorganic small molecules such as CO۲ and H۲O via highly active HO•, HO۲•, and h+ radicals.

کلیدواژه ها:

Perovskite ، LaCoO۳ ، catalyst ، Photocatalysis ، Phenol