| Autor: |
Rosales-González, O., Olivares-Lugo, L. I., Sánchez-De Jesús, F., Cortés-Escobedo, C. A., Martínez-Luévanos, A., Bolarín-Miró, A. M. |
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| Zdroj: |
Journal of Electronic Materials; Nov2023, Vol. 52 Issue 11, p7652-7666, 15p |
| Abstrakt: |
In this work, the photocatalytic activity of bismuth-doped lanthanum ferrite, La1-xBixFeO3 (0 ≤ x ≤ 0.5), synthesized by high-energy ball milling assisted by annealing, is reported. X-ray diffraction and Rietveld refinement confirmed that pure lanthanum ferrite with an orthorhombic structure (Pbnm) was obtained for dopant levels lower than 0.2 mol Bi3+. Higher dopant levels produce the transformation from LaFeO3 to BiFeO3 with the same orthorhombic structure (Pnma), and consequently, a mixture of phases is present in these compositions. The band gap values obtained from diffuse reflectance spectroscopy show a general decrease as bismuth content increases, from 2.10 eV for undoped to 2.00 eV for 0.5 mol doped. For any increase in Bi3+ concentration, all values indicate visible-light absorption. LaFeO3 synthesized powders show high photocatalytic degradation of methylene blue under visible light. Nevertheless, the synthesized bismuth-doped ferrites show a slight decrease, attributed to (i) the modification in the band gap, (ii) the change in the band gap border, and (iii) the presence of a mixture of phases, inducing a heterojunction effect. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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