Photocatalytic activity of doped lanthanum ferrites
Abstract
Water contamination by dyes represents a serious problem due to its detrimental effects on health and the environment, and multiple methods have been developed for its remediation. In this context, advanced oxidation processes, based on photocatalysis, emerge as one of the most effective. In this research, the degradation capacity of lanthanum ferrite with different doping levels, with Co2+ and Ca2+, synthesized by high-energy milling assisted by heat treatment at 800°C, was examined for the removal of methylene blue as a contaminant in aqueous media. X-ray diffraction results confirmed the synthesis of a pure lanthanum ferrite phase with orthorhombic (Pbnm) crystal structure, independent of the doping level. At the same time, the forbidden band energy of the ferrites was quantified, which were found to be in the visible light range, 2.10 to 2.30 eV. The degradation capacity was evaluated under a visible light spectrum using methylene blue as contaminant, evidencing a high degradation efficiency, close to 65 % in 180 minutes. The magnetic behavior of the samples, determined by vibrating sample magnetometry, revealed a ferromagnetic order for the doped samples, making this material a magnetically recoverable photocatalyst.
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References
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Copyright (c) 2024 Lucia Idalia Olivares Lugo, Melissa Claudio López, Félix Sánchez De Jesús, Claudia Alicia Cortés Escobedo, Antonia Martínez Luévanos, Ana María Bolarín Miró
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