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

A self-organized TiO 2 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 TiO 2 nanotubes on their photocatalytic activities for amido b...

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Bibliographic Details
Published in:Catalysis letters 2024-03, Vol.154 (3), p.1242-1254
Main Authors: Hajjaji, M. A., Missaoui, K., Trabelsi, K., Bouzaza, A., Bessais, B., Hajjaji, A., Assadi, A. A.
Format: Article
Language:English
Subjects:
Catalysis
Catalytic activity
Chemical Sciences
Chemistry
Chemistry and Materials Science
Dyes
Electrodeposition
Electron microscopy
Free radicals
Hydroxyl radicals
Industrial Chemistry/Chemical Engineering
Material chemistry
Microscopy
Nanoparticles
Nanotubes
Organometallic Chemistry
Photocatalysis
Photodegradation
Photoluminescence
Physical Chemistry
Platinum
Substrates
Titanium
Titanium dioxide
Ultraviolet radiation
Work functions
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Summary:A self-organized TiO 2 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 TiO 2 nanotubes on their photocatalytic activities for amido black (AB) dye degradation was studied. Morphological characterizations showed a highly ordered nanotubular TiO 2 structure with 15 μm 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 TiO 2 -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/TiO 2 -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/TiO 2  NTs is one of the best photocatalyst for dye degradation. Furthermore, quenching studies were performed and shows that hydroxyl radicals (OH°) and superoxide free radicals (O 2 °) were the primary and secondary reactive species during photo-degradation. Graphical Abstract
ISSN:1011-372X
1572-879X
DOI:10.1007/s10562-023-04380-5