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Photocatalytic activity of Bi0.8La0.2FeO3−xK0.5Na0.5NbO3 ceramic powders

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Abstract

(1−x)Bi0.8La0.2FeO3−xK0.5Na0.5NbO3) (x = 0.00; 0.05; 0.10, 1.00) or ‘BLFO-KNN’ was prepared by the combustion method, using KNO3, NaNO3, NH4NbO(C2O4)2(H2O)2, Bi(NO3)⋅5H2O, La(CH3COO)3 and 5Fe(NO3)3⋅9H2O as starting materials. The microstructural features of the synthesized nanoparticles were characterized by X-ray powder diffraction and Raman spectroscopy. Rietveld refinement showed coexistence of orthorhombic-monoclinic phases for the powders obtained with x = 0.05 and 0.10. The photocatalytic activity of the BLFO-KNN, at different pH values, was investigated via degradation of rhodamine 6G (Rh6G) dye in a photoreactor equipped with commercial lamps that simulated sunlight. The results showed that BLFO can absorb visible light, whereas KNN absorbs in the ultraviolet range. There is a strong effect of the pH on the photocatalytic activity, with the highest activity for the Bi0.8La0.2FeO3 system at pH = 2 (~90% degradation efficiency for x = 0.0).

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Acknowledgements

We acknowledge the financial support from Universidad del Cauca and the Companhia Brasileira de Metalurgia e Mineração (CBMM) for the donation of the niobium ammonium oxalate used in this research.

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Authors and Affiliations

  1. Grupo de Ciencia y Tecnología de Materiales Cerámicos (CYTEMAC), Universidad del Cauca, Calle 5 No 4-70, Sede Tulcan, Popayán, 190002, Colombia

    Elvira-Giraldo Sebastián, Gaona J Sonia & C F V Raigoza

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  1. Elvira-Giraldo Sebastián
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  2. Gaona J Sonia
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  3. C F V Raigoza
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Correspondence to Gaona J Sonia.

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Sebastián, EG., Sonia, G.J. & Raigoza, C.F.V. Photocatalytic activity of Bi0.8La0.2FeO3−xK0.5Na0.5NbO3 ceramic powders. Bull Mater Sci 46, 33 (2023). https://doi.org/10.1007/s12034-022-02872-5

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  • DOI: https://doi.org/10.1007/s12034-022-02872-5

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