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Article Dans Une Revue Journal of Photochemistry and Photobiology A: Chemistry Année : 2022

Enhancement of the photocatalytic response of Cu-doped TiO2 nanotubes induced by the addition of strontium

W. Alrashedi
  • Fonction : Auteur
H. Kochkar
  • Fonction : Auteur
M. Younas
  • Fonction : Auteur
A. Ben Ali
  • Fonction : Auteur
N.A. Alomair
  • Fonction : Auteur
R. Hamdi
  • Fonction : Auteur
S.A. Abubshait
  • Fonction : Auteur
O. Alagha
  • Fonction : Auteur
M.F. Gondal
  • Fonction : Auteur
M. Haroun
  • Fonction : Auteur
C. Tratrat
  • Fonction : Auteur

Résumé

The influence of adding strontium to Cu-doped TiO2 nanotubes on the photocatalytic performance of the resulting materials was herein studied considering changes in structural, textural, optical and morphological properties. Addition of strontium was performed in a 0.2-1.0 wt% range while an optimized fixed Cu loading of 0.5 wt% was used. TiO2 nanotubes were obtained using alkaline hydrothermal treatment of P25 followed by a calcination treatment at 400°C. The resulting TiNT material was then impregnated with copper using an incipient wetness impregnation followed by a new calcination at 400°C (0.5Cu-TiNT). Strontium was then added under similar impregnationcalcination conditions. The effect of adding various amounts onto 0.5Cu-TiNT was therefore deeply characterized using X-ray diffraction, N2 adsorption-desorption measurements, scanning electron microscopy coupled with energy-dispersive X-ray analysis, Raman, UV-vis diffuse reflectance, X-ray photoelectron, and photoluminescence spectroscopies as well as determining dielectric properties. Results clearly emphasize that up to a Sr loading of 0.8 wt%, the addition of Sr results in in situ formation of Sr-O-Ti entities on the surface of 0.5Cu-TiNT. Above this threshold loading, excess Sr loading leads to the formation of segregated SrO species. Finally, a direct correlation was observed here between the optimized formation of surface Sr-O-Ti entities and an enhanced 2 photocatalytic response due to improved stabilization of photogenerated charges on 0.5Cu-TiNT resulting from the ferroelectric interference of neighboring SrTiO3 entities.

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Chimie
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Dates et versions

hal-03842495 , version 1 (07-11-2022)

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W. Alrashedi, H. Kochkar, G. Berhault, M. Younas, A. Ben Ali, et al.. Enhancement of the photocatalytic response of Cu-doped TiO2 nanotubes induced by the addition of strontium. Journal of Photochemistry and Photobiology A: Chemistry, 2022, 428, pp.113858. ⟨10.1016/j.jphotochem.2022.113858⟩. ⟨hal-03842495⟩
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