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g-C3N4/TiO2 S-scheme heterojunction photocatalyst with enhanced photocatalytic Carbamazepine degradation and mineralization

Abstract : In the present work, UVA light-driven g-C3N4/TiO2 photocatalyst was synthesized for the photodegradation of Carbamazepine (CBZ) in aqueous medium. The morphological, the optical properties and the structure of the TiO2, g-C3N4 and the prepared composites were analyzed using X-ray diffraction (XRD), Nitrogen adsorption-desorption isotherm based on BET, Raman Spectroscopy, Scanning Electron Microscopy (SEM) with EDX, UV-vis Diffuse Reflectance Spectroscopy (UVvis DRS). Optical absorption studies revealed a 2.97 and 2.78 eV of band gap for the developed composites for 10%g-C3N4/TiO2 (A10) and 30%g-C3N4/TiO2 (A30), respectively. The N2 adsorption-desorption isotherm showed an 80.64 and 59.67 m 2 /g of specific surface area for A10 and A30, respectively. Photodegradation studies show that A10 a composite photo-catalyst can eliminate 71.41% of CBZ with 30.38 % of mineralization yield within 360 min of UVA irradiation at optimum conditions (10 ppm of initial CBZ concentration and 0.1 g of 10%g-C3N4/TiO2 loading). The kinetic results showed that the removal of this pollutant nearly followed a First-order kinetic model with a regression coefficient (R 2) values more than 0.98 and a Hight reaction rate constant recorded of 0.0034 min-1 for A10.
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https://hal-normandie-univ.archives-ouvertes.fr/hal-03655633
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Submitted on : Friday, April 29, 2022 - 5:37:41 PM
Last modification on : Tuesday, May 3, 2022 - 11:23:54 AM

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Abdoulaye Kane, Latifa Chafiq, Sadou Dalhatou, Pierre Bonnet, Maryline Nasr, et al.. g-C3N4/TiO2 S-scheme heterojunction photocatalyst with enhanced photocatalytic Carbamazepine degradation and mineralization. Journal of Photochemistry and Photobiology A: Chemistry, Elsevier, 2022, 430, pp.113971. ⟨10.1016/j.jphotochem.2022.113971⟩. ⟨hal-03655633⟩

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