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    • Keywords


      Combustion; visible-light irradiation; photocatalysis; rhodamine 6G.

    • Abstract


      (1-x)Bi$_{0.8}$La$_{0.2}$FeO$_{3-x}$K$_{0.5}$Na$_{0.5}$NbO$_3$) (x = 0.00; 0.05; 0.10, 1.00) or ‘BLFO-KNN’ was prepared by the combustion method, using KNO$_3$, NaNO$_3$, NH$_4$NbO(C$_2$O$_4$)$_2$(H$_2$O)$_2$, Bi(NO$_3$).5H$_2$O, La(CH$_3$COO)$_3$ and 5Fe(NO$_3$)$_3$.9H$_2$O 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 Bi$_{0.8}$La$_{0.2}$FeO$_3$ system at pH = 2 (${\sim}$90% degradation efficiency for x = 0.0).

    • Author Affiliations



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

  • Bulletin of Materials Science | News

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