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Article

The Influence of the Ratio of Au and Pt Nanoparticles in Ternary Composites with TiO2

by 1,2, 2,3, 1,4,* and 1,2,3,*
1
Department of Applied and Environmental Chemistry, University of Szeged, Rerrich Béla sqr. 1, HU-6720 Szeged, Hungary
2
Nanostructured Materials and Bio-Nano-Interfaces Center, Institute for Interdisciplinary Research on Bio-Nano-Sciences, Babes Bolyai University, Treboniu Laurian str. 42, RO-400271 Cluj-Napoca, Romania
3
Faculty of Physics, Babes Bolyai University, Mihail Kogalniceanu str. 1, RO-400084 Cluj-Napoca, Romania
4
Institute of Physical Metallurgy, Metal Forming and Nanotechnology, University of Miskolc, HU-3515 Miskolc-Egyetemváros, Hungary
*
Authors to whom correspondence should be addressed.
Academic Editors: Jan Vrestal, Leonid M. Kustov and Isabel Duarte
Metals 2021, 11(4), 628; https://doi.org/10.3390/met11040628
Received: 23 February 2021 / Revised: 26 March 2021 / Accepted: 2 April 2021 / Published: 13 April 2021
(This article belongs to the Special Issue Metallic Nanocomposites)
In the present work, ternary composites were synthesized from commercial titanias (Evonik Aeroxide P25, Aldrich anatase—AA and Aldrich rutile—AR) and two noble metals (gold and platinum). This research focuses on the composition of the photocatalysts, especially on the noble metals. The ratio between the noble metals varies from 0.25 to 0.75% in each composite for each noble metal. Transmission electron microscopy (TEM), X-ray diffraction (XRD) and diffuse reflectance spectroscopy (DRS) measurements were carried out to investigate the structural and optical properties. From the TEM, it can be observed that the particle sizes of the noble metals were between 1 and 4 nm, while the (anatase and rutile) crystals of P25 were 20–40 nm. The XRD showed that the semiconductors’ composition remained unchanged during/after the deposition of noble metal nanoparticles. By the DRS measurements, using the Kubelka–Munk equation, it can be concluded that the deposition of the noble metal nanoparticles resulted the decrease of the bandgap energies of the titanias. The photocatalytic activity was investigated under the irradiation of UV light. Oxalic acid and salicylic acid were used as model pollutants. The hydrogen production capacity was investigated as well, where the sacrificial agent was oxalic acid, and UV irradiation was used. View Full-Text
Keywords: photocatalysis; commercial titania; noble metal nanoparticles; composites; UV light photocatalysis; commercial titania; noble metal nanoparticles; composites; UV light
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MDPI and ACS Style

Hampel, B.; Baia, L.; Hernadi, K.; Pap, Z. The Influence of the Ratio of Au and Pt Nanoparticles in Ternary Composites with TiO2. Metals 2021, 11, 628. https://doi.org/10.3390/met11040628

AMA Style

Hampel B, Baia L, Hernadi K, Pap Z. The Influence of the Ratio of Au and Pt Nanoparticles in Ternary Composites with TiO2. Metals. 2021; 11(4):628. https://doi.org/10.3390/met11040628

Chicago/Turabian Style

Hampel, Boglárka; Baia, Lucian; Hernadi, Klara; Pap, Zsolt. 2021. "The Influence of the Ratio of Au and Pt Nanoparticles in Ternary Composites with TiO2" Metals 11, no. 4: 628. https://doi.org/10.3390/met11040628

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