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Article

UV-Vis-Induced Degradation of Phenol over Magnetic Photocatalysts Modified with Pt, Pd, Cu and Au Nanoparticles

1
Faculty of Chemistry, Gdansk University of Technology, 80-233 Gdansk, Poland
2
Institute for Catalysis (ICAT), Hokkaido University, Sapporo 001-0021, Japan
3
Faculty of Applied Physics and Mathematics, Gdansk University of Technology, 80-233 Gdansk, Poland
4
NanoBioMedical Center, Adam Mickiewicz University, 61-614 Poznan, Poland
*
Author to whom correspondence should be addressed.
Nanomaterials 2018, 8(1), 28; https://doi.org/10.3390/nano8010028
Received: 20 November 2017 / Revised: 23 December 2017 / Accepted: 1 January 2018 / Published: 7 January 2018
(This article belongs to the Special Issue Noble Metal Nanoparticles in Catalysis)
The combination of TiO2 photocatalyst and magnetic oxide nanoparticles enhances the separation and recoverable properties of nanosized TiO2 photocatalyst. Metal-modified (Me = Pd, Au, Pt, Cu) TiO2/SiO2@Fe3O4 nanocomposites were prepared by an ultrasonic-assisted sol-gel method. All prepared samples were characterized by X-ray powder diffraction (XRD) analysis, Brunauer-Emmett-Teller (BET) method, X-ray photoelectron spectroscopy (XPS), scanning transmission electron microscopy (STEM), Mott-Schottky analysis and photoluminescence spectroscopy (PL). Phenol oxidation pathways of magnetic photocatalysts modified with Pt, Pd, Cu and Au nanoparticles proceeded by generation of reactive oxygen species, which oxidized phenol to benzoquinone, hydroquinone and catechol. Benzoquinone and maleic acid were products, which were determined in the hydroquinone oxidation pathway. The highest mineralization rate was observed for Pd-TiO2/SiO2@Fe3O4 and Cu-TiO2/SiO2@Fe3O4 photocatalysts, which produced the highest concentration of catechol during photocatalytic reaction. For Pt-TiO2/SiO2@Fe3O4 nanocomposite, a lack of catechol after 60 min of irradiation resulted in low mineralization rate (CO2 formation). It is proposed that the enhanced photocatalytic activity of palladium and copper-modified photocatalysts is related to an increase in the amount of adsorption sites and efficient charge carrier separation, whereas the keto-enol tautomeric equilibrium retards the rate of phenol photomineralization on Au-TiO2/SiO2@Fe3O4. The magnetization hysteresis loop indicated that the obtained hybrid photocatalyst showed magnetic properties and therefore could be easily separated after treatment process. View Full-Text
Keywords: heterogeneous photocatalysis; magnetic photocatalysts; modification of titanium(IV) oxide; mechanism of degradation; noble metal nanoparticles; phenol heterogeneous photocatalysis; magnetic photocatalysts; modification of titanium(IV) oxide; mechanism of degradation; noble metal nanoparticles; phenol
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MDPI and ACS Style

Wysocka, I.; Kowalska, E.; Trzciński, K.; Łapiński, M.; Nowaczyk, G.; Zielińska-Jurek, A. UV-Vis-Induced Degradation of Phenol over Magnetic Photocatalysts Modified with Pt, Pd, Cu and Au Nanoparticles. Nanomaterials 2018, 8, 28. https://doi.org/10.3390/nano8010028

AMA Style

Wysocka I, Kowalska E, Trzciński K, Łapiński M, Nowaczyk G, Zielińska-Jurek A. UV-Vis-Induced Degradation of Phenol over Magnetic Photocatalysts Modified with Pt, Pd, Cu and Au Nanoparticles. Nanomaterials. 2018; 8(1):28. https://doi.org/10.3390/nano8010028

Chicago/Turabian Style

Wysocka, Izabela, Ewa Kowalska, Konrad Trzciński, Marcin Łapiński, Grzegorz Nowaczyk, and Anna Zielińska-Jurek. 2018. "UV-Vis-Induced Degradation of Phenol over Magnetic Photocatalysts Modified with Pt, Pd, Cu and Au Nanoparticles" Nanomaterials 8, no. 1: 28. https://doi.org/10.3390/nano8010028

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