Electrodeposited Platinum Nanoparticles on Highly Ordered Titanium Dioxide Nanotubes for Photocatalytic Application: Enhancement of Photocatalytic Degradation of Amido Black Dye - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Catalysis Letters Année : 2023

Electrodeposited Platinum Nanoparticles on Highly Ordered Titanium Dioxide Nanotubes for Photocatalytic Application: Enhancement of Photocatalytic Degradation of Amido Black Dye

Résumé

A self-organized TiO2 nanotubes were fabricated via anodization on Titanium substrate and loaded with dispersed platinum nanoparticles using electrodeposition method. The effect of electrodeposited Pt NPs (100 s, 200 s, 300 s, 600 s) on TiO2 nanotubes on their photocatalytic activities for amido black (AB) dye degradation was studied. Morphological characterizations showed a highly ordered nanotubular TiO2 structure with 15 mu m of length and 100 nm of diameter using Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy ( TEM) technics. Optical characterizations such as photoluminescence and diffuse reflectance spectroscopy proved the charges exchange between metal NPs and the semiconductor. The successful depositions of Pt on to the surface of TiO2-NTs contributed for the improved photocatalytic activity compared to the pure sample, due to the greater the work function of platinum nanoparticle, which further anchored the separation of photogenerated electron-hole pairs. It was found that the sample Pt/TiO2-NTs with 200 s of Pt deposition time offered the highest photocatalytic performance, this sample resulted 97% degradation after 90 min under UV irradiation. Due to the plasmonic effect of Pt nanoparticles we obtained an intensification in the photocatalytic activity. Kinetic studies demonstrated that the apparent first-order kinetics for the corresponding photocatalytic reaction shows that Pt/TiO2 NTs is one of the best photocatalyst for dye degradation. Furthermore, quenching studies were performed and shows that hydroxyl radicals (OH degrees) and superoxide free radicals (O-2 degrees) were the primary and secondary reactive species during photo-degradation. [GRAPHICS] .

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Dates et versions

hal-04192783 , version 1 (31-08-2023)

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M. A. Hajjaji, K. Missaoui, K. Trabelsi, A. Bouzaza, B. Bessais, et al.. Electrodeposited Platinum Nanoparticles on Highly Ordered Titanium Dioxide Nanotubes for Photocatalytic Application: Enhancement of Photocatalytic Degradation of Amido Black Dye. Catalysis Letters, 2023, ⟨10.1007/s10562-023-04380-5⟩. ⟨hal-04192783⟩
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