Reaching Visible Light Photocatalysts with Pt Nanoparticles Supported in TiO2-CeO2

Nanostructured catalysts of platinum (Pt) supported on commercial TiO2, as well as TiO2-CeO2 (1, 5 and 10 wt% CeO2), were synthesized through the Sol-Gel and impregnation method doped to 1 wt% of Platinum, in order to obtain a viable photocatalytic material able to oxidate organic pollutants under t...

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Published in:Materials 2022-09, Vol.15 (19), p.6784
Main Authors: Mejia-Estrella, Ixchel Alejandra, Pérez Larios, Alejandro, Sulbarán-Rangel, Belkis, Guzmán González, Carlos Alberto
Format: Article
Language:English
Subjects:
Catalysts
Cerium oxides
Diameters
Dichlorophenoxyacetic acid
Efficiency
Energy gap
Ethanol
Herbicides
Hydrochloric acid
Methods
Nanoparticles
Oxidation
Photocatalysis
Photoelectrons
Platinum
Pollutants
Reagents
Sol-gel processes
Titanium dioxide
VOCs
Volatile organic compounds
X ray photoelectron spectroscopy
Zinc oxides
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Summary:Nanostructured catalysts of platinum (Pt) supported on commercial TiO2, as well as TiO2-CeO2 (1, 5 and 10 wt% CeO2), were synthesized through the Sol-Gel and impregnation method doped to 1 wt% of Platinum, in order to obtain a viable photocatalytic material able to oxidate organic pollutants under the visible light spectrum. The materials were characterized by different spectroscopy and surface techniques such as Specific surface area (BET), X-ray photoelectron spectroscopy (XPS), XRD, and TEM. The results showed an increase in the diameter of the pore as well as the superficial area of the supports as a function of the CeO2 content. TEM images showed Pt nanoparticles ranking from 2–7 nm, a decrease in the particle size due to the increase of CeO2. The XPS showed oxidized Pt2+ and reduced Pt0 species; also, the relative abundance of the elements Ce3+/Ce4− and Ti4+ on the catalysts. Additionally, a shift in the Eg band gap energy (3.02–2.82 eV) was observed by UV–vis, proving the facticity of applying these materials in a photocatalytic reaction using visible light. Finally, all the synthesized materials were tested on their photocatalytic oxidation activity on a herbicide used worldwide; 2,4-Dichlorophenoxyacetic acid, frequently use in the agriculture in the state of Jalisco. The kinetics activity of each material was measured during 6 h of reaction at UV–Vis 190–400 nm, reaching a removal efficiency of 98% of the initial concentration of the pollutant in 6 h, compared to 32% using unmodified TiO2 in 6 h.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma15196784