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Preparation and photo-electrochemical characterization of KAlPO4F: application to photodegradation of methyl violet under sunlight

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Abstract

The oxyfluorophosphate KAlPO4F compound was synthesized by hydrothermal route at 453 K and the physical and photo-electrochemical properties were reported for the first time. The as- prepared compound crystallizes in an orthorhombic system (Space Group: Pnna) with the refined lattice constants: a = 12.612(5) Å, b = 10.172(3) Å, c = 6.205(0) Å. The direct optical transition of 4.93 eV, determined from the diffuse reflectance, is assigned to the charge transfer F−: 2p → K+: 4 s. The electrochemical measurement in Na2SO4 electrolyte gives a flat band potential (Efb) of + 0.28 VSCE. The single crystal exhibits an intrinsic behavior with a donor density of 1015 cm−3 and a valence band deriving mostly from F−: 2p orbital. The electrochemical impedance spectroscopy shows a semicircle attributed to the bulk property, an intrinsic comportment. The photocatalytic performance was successfully tested through the degradation under solar light of methyl violet (MV), a hazardous and persistent dye. A total discoloration was obtained after 5 h illumination and a reaction mechanism is proposed.

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Acknowledgements

The authors are grateful to A.M. Djaballah for technical assistance in photocatalytic experiments.

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Authors and Affiliations

  1. Laboratory of Electrochemistry-Corrosion, Metallurgy and Inorganic Chemistry, Faculty of Chemistry, USTHB, BP 32, 16111, Algiers, Algeria

    R. Bagtache & K. Abdmeziem

  2. Laboratory of Storage and Valorization of Renewable Energies, Faculty of Chemistry, USTHB, BP 32, 16111, Algiers, Algeria

    R. Brahimi & M. Trari

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  1. R. Bagtache
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  2. R. Brahimi
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  3. K. Abdmeziem
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  4. M. Trari
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Correspondence to R. Bagtache or M. Trari.

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Bagtache, R., Brahimi, R., Abdmeziem, K. et al. Preparation and photo-electrochemical characterization of KAlPO4F: application to photodegradation of methyl violet under sunlight. Reac Kinet Mech Cat 133, 1111–1120 (2021). https://doi.org/10.1007/s11144-021-02010-y

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