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Article Dans Une Revue Journal of Materials Science: Materials in Electronics Année : 2021

Structural and electrochemical characterizations of Bi12CoO20 sillenite crystals: degradation and reduction of organic and inorganic pollutants

Résumé

The present contribution is to synthesize and characterize a new material photocatalyst. It also explores the possibility of using it to remove organic and inorganic pollutants in water. In this context, the sillenite Bi12CoO20 (BCO) in pure phase was synthesized by the combustion sol-gel method. The phase was identified by X-ray diffraction (XRD) then it was refined in the cubic symmetry in the space group (I23 N degrees 197) using the Rietveld refinement method; the lattice constant was accurately determined. A direct optical bandgap of 2.56 eV was evaluated using the UV-Visible diffuse reflectance. The electrochemical properties were investigated for the first time. A flat band potential of E-fb = 0.62 V-SCE was found with a p-type character; the hole density N-d = 54.2 x 10(17) cm(-3) extends the depletion width at 27 nm. The photocatalytic activity of BCO nanoparticles was tested to eliminate organic and inorganic pollutants namely the Basic red 46 (BR46) and hexavalent chromium Cr(VI). An acceptable rate was observed within 3 h for both contaminants.

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Chimie
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Dates et versions

hal-03245250 , version 1 (01-06-2021)

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Hamza Kenfoud, Oussama Baaloudj, Noureddine Nasrallah, Radia Bagtache, Aymen Amin Assadi, et al.. Structural and electrochemical characterizations of Bi12CoO20 sillenite crystals: degradation and reduction of organic and inorganic pollutants. Journal of Materials Science: Materials in Electronics, 2021, 32 (12), pp.16411-16420. ⟨10.1007/s10854-021-06194-w⟩. ⟨hal-03245250⟩
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