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Article

Unexpected Link between the Template Purification Solvent and the Structure of Titanium Dioxide Hollow Spheres

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Research Group of Environmental Chemistry, Institute of Chemistry, University of Szeged, Tisza Lajos krt. 103, H-6720 Szeged, Hungary
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Department of Applied and Environmental Chemistry, University of Szeged, Rerrich tér 1, H-6720 Szeged, Hungary
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Nanostructured Materials and Bio-Nano-Interfaces Center, Interdisciplinary Research Institute on Bio-Nano-Sciences, Babes-Bolyai University, Treboniu Laurian 42, RO-400271 Cluj-Napoca, Romania
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Department of Process Engineering, Faculty of Engineering, University of Szeged, Moszkvai krt. 9, H-6725 Szeged, Hungary
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Institute of Environmental Science and Technology, University of Szeged, Tisza Lajos krt. 103, H-6720 Szeged, Hungary
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Authors to whom correspondence should be addressed.
Catalysts 2021, 11(1), 112; https://doi.org/10.3390/catal11010112
Received: 7 December 2020 / Revised: 9 January 2021 / Accepted: 11 January 2021 / Published: 14 January 2021
(This article belongs to the Special Issue Recent Advances in Photocatalysis Technology in Europe and Asia)
Carbon spheres were applied as templates to synthesize titanium dioxide hollow spheres. The templates were purified with either ethanol or acetone, and the effects of this treatment on the properties of the resulting titania were investigated. The photocatalytic activity of the catalysts was measured via the decomposition of phenol model pollutant under visible light irradiation. It was found that the solvent used for the purification of the carbon spheres had a surprisingly large impact on the crystal phase composition, morphology, and photocatalytic activity. Using ethanol resulted in a predominantly rutile phase titanium dioxide with regular morphology and higher photocatalytic activity (r0,phenol = 3.9 × 10−9 M∙s−1) than that containing mainly anatase phase prepared using acetone (r0,phenol = 1.2 × 10−9 M∙s−1), surpassing the photocatalytic activity of all investigated references. Based on infrared spectroscopy measurements, it was found that the carbon sphere templates had different surface properties that could result in the appearance of carbonate species in the titania lattice. The presence or absence of these species was found to be the determining factor in the development of the titania’s properties. View Full-Text
Keywords: titanium dioxide; carbon spheres; hollow spheres; phenol; purification; ethanol; acetone titanium dioxide; carbon spheres; hollow spheres; phenol; purification; ethanol; acetone
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MDPI and ACS Style

Gyulavári, T.; Kovács, K.; Magyari, K.; Baán, K.; Szabó, A.; Veréb, G.; Pap, Z.; Hernadi, K. Unexpected Link between the Template Purification Solvent and the Structure of Titanium Dioxide Hollow Spheres. Catalysts 2021, 11, 112. https://doi.org/10.3390/catal11010112

AMA Style

Gyulavári T, Kovács K, Magyari K, Baán K, Szabó A, Veréb G, Pap Z, Hernadi K. Unexpected Link between the Template Purification Solvent and the Structure of Titanium Dioxide Hollow Spheres. Catalysts. 2021; 11(1):112. https://doi.org/10.3390/catal11010112

Chicago/Turabian Style

Gyulavári, Tamás; Kovács, Kata; Magyari, Klára; Baán, Kornélia; Szabó, Anna; Veréb, Gábor; Pap, Zsolt; Hernadi, Klara. 2021. "Unexpected Link between the Template Purification Solvent and the Structure of Titanium Dioxide Hollow Spheres" Catalysts 11, no. 1: 112. https://doi.org/10.3390/catal11010112

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