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Article Dans Une Revue Inorganic Chemistry Communications Année : 2023

Synthesis, physical and electrochemical characterization of CoCr2O4 and its application as photocatalyst under solar irradiation

Résumé

The aim of this study was to examine the potential of CoCr2O4, produced by co-precipitation method to degrade the hazardous dye Congo red (CR) when exposed to solar light irradiation. The as-prepared spinel was characterized by X-ray diffraction, attenuated total reflectance-Fourier transform, BET, X-ray photoelectron spectroscopy, scanning electron-microscopy with integrated EDX, and UV–Vis Diffuse Reflectance Spectroscopy. The experimental tests found that CoCr2O4 has a direct transition with a band gap (Eg) of 1.74 eV. Curiously, the normal spinel crystallizing in a cubic symmetry exhibits n-type conduction and to confirm such type behavior of CoCr2O4, electrochemical characterization was undertaken to determine the flat band potential using the Mott-Schottky plot of the interfacial capacitance. The pseudo-second order model was used to fit the kinetic data of CR adsorption. The results of the photodegradation tests showed that n- CoCr2O4 nanoparticles facilitated the separation of photogenerated electrons/holes (e-/h+) pairs by decreasing the recombination process. This increased the overall efficiency of the photocatalytic process, up to be 94% in oxidizing the CR molecules after 180 min with a low catalyst dose of 0.2 g/L. A reaction mechanism is suggested based on a potential band diagram to explain the photocatalytic degradation of the dye onto CoCr2O4 surface.
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Dates et versions

hal-04266268 , version 1 (31-10-2023)

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D. Chaibeddra, M. Benamira, Marie Colmont, H. Boulehbal, H. Lahmar, et al.. Synthesis, physical and electrochemical characterization of CoCr2O4 and its application as photocatalyst under solar irradiation. Inorganic Chemistry Communications, 2023, Inorganic Chemistry Communications, 155, ⟨10.1016/j.inoche.2023.111116⟩. ⟨hal-04266268⟩
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