Polycrystalline BiVO4 visible-light photocatalytic activity: Rietveld refinement, microstructural, vibrational, and photocatalytic properties

Lotfi, Safia and El Ouardi, Mohamed and Arab, Madjid and Assani, Abderrazzak and BaQais, Amal and Haspel, Henrik and Kónya, Zoltán and Ait Ahsaine, Hassan (2025) Polycrystalline BiVO4 visible-light photocatalytic activity: Rietveld refinement, microstructural, vibrational, and photocatalytic properties. OXFORD OPEN MATERIALS SCIENCE, 5 (1). No. itaf005. ISSN 2633-6979

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Abstract

Herein, we have successfully synthesized BiVO4 photocatalysts via a simple chemical precipitation method followed by heat treatment at 400°C, 500°C, and 600°C. The samples were characterized by XRD combined with Rietveld refinement, Raman spectroscopy, SEM, and UV- vis DRS. XRD results showed that we obtained monoclinic scheelite phase (m-s BiVO4) with I112/b space group. The visible–light photocatalytic activities of BiVO4 -400°C, 500°C, and 600°C for organic dye degradation (MB: methylene blue; MO: and methyl orange) were investigated, and the BiVO4 400°C showed the highest activity in the photodegradation of MB (95%) and MO (80%) after 150 min of visible illumination. The photocatalytic degradation mechanism was proposed based on radical trapping measurements and Mott–Schottky analysis.

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