Preparation of M₂O₃-CeO₂ (M=La, Fe, and Al) Compoundoxide Catalyst and Its Degradation Performance

Abstract

As one of the most active rare earths, CeO₂ has caused extensive concern due to its multifunctional properties. CeO₂-based compound oxide of M₂O₃-CeO₂ (M=La, Fe, and Al) were prepared by coprecipitation and impregnation methods. The photocatalytic performance of the samples for the degradation methylene blue was studied under UV and visible light irradiation. The effects of constituents on the properties of the CeO₂-based catalysts were investigated by XRD, TEM, BET, and UV-Vis spectrophotometer. The highest degradation of methylene blue under 230W UV light was almost 100% at 50 min by La₂O₃/Fe₂O₃-CeO₂/γ-Al₂O₃ catalyst and 99.42% at 50 min by Fe₂O₃-CeO₂/γ-Al₂O₃ catalyst. The methylene blue removal efficiency under indoor natural light reaches 93.81% by La₂O₃/Fe₂O₃-CeO₂/γ-Al₂O₃ catalyst and 92.34% by Fe₂O₃-CeO₂/γ-Al₂O₃ catalyst at 50 min. The order of catalytic degradation activity is La₂O₃/Fe₂O₃-CeO₂/γ-Al₂O₃>Fe₂O₃-CeO₂/γ-Al₂O₃> La₂O₃-CeO₂/γ-Al₂O₃>Al₂O₃, owing to their structural features. The doping of La³⁺ or Fe³⁺ onto CeO₂/γ-Al₂O produced much more oxygen vacancies under light irradiation and reduced the energy laps of CeO₂ with value of 2.86 ev, which improved the photocatalytic redox performance of the composite oxide.

Keywords

CeO₂-based / compound oxide / catalyst / degradation / catalysis

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