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Low-Temperature Mineralisation of Titania-Siloxane Composite Layers

Faculty of Chemistry, Brno University of Technology, Purkyňova 118, 612 00 Brno, Czech Republic
Department of Physical Electronics, Faculty of Science, Masaryk University, Kotlářská 267/2, 611 37 Brno, Czech Republic
Author to whom correspondence should be addressed.
Catalysts 2021, 11(1), 50;
Received: 12 October 2020 / Revised: 2 December 2020 / Accepted: 4 December 2020 / Published: 1 January 2021
This paper deals with low-temperature mineralisation of coatings made with titania-siloxane compositions (TSC). Methyltriethoxysilane has been adopted as the precursor for the siloxane, and during its synthesis, an oligomeric siloxane condensate with methyl moieties acting as TiO2 binder has been produced. These methyl moieties, contained in TSC, provide solubility and prevent gelling, but reduce the hydrophilicity of the system, reduce the transfer of electrons and holes generated in the TiO2. In order to avoid these unfavourable effects, TSC mineralisation can be achieved by nonthermal treatment, for example, by using UV-radiation or plasma treatment. Characterisation of the siloxane was performed by gel permeation chromatography (GPC), which showed the size of the siloxane chain. Thermogravimetric analysis revealed a temperature at which the siloxane mineralises to SiO2. Printed layers of two types of TSC with different siloxane contents were studied by a scanning electron microscope (SEM), where a difference in the porosity of the samples was observed. TSC on fluorine-doped tin oxide (FTO) coated glass and microscopic glass were treated with non-thermal UV and plasma methods. TSC on FTO glass were tested by voltammetric measurements, which showed that the non-thermally treated layers have better properties and the amount of siloxane in the TSC has a great influence on their efficiency. Samples on microscopic glass were subjected to a photocatalytic decomposition test of the model pollutant Acid orange 7 (AO7). Non-thermally treated samples show higher photocatalytic activity than the raw sample. View Full-Text
Keywords: titanium oxide; methyltriethoxysilane; siloxane; plasma treatment; UV treatment; AO7 titanium oxide; methyltriethoxysilane; siloxane; plasma treatment; UV treatment; AO7
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MDPI and ACS Style

Svoboda, T.; Veselý, M.; Bartoš, R.; Homola, T.; Dzik, P. Low-Temperature Mineralisation of Titania-Siloxane Composite Layers. Catalysts 2021, 11, 50.

AMA Style

Svoboda T, Veselý M, Bartoš R, Homola T, Dzik P. Low-Temperature Mineralisation of Titania-Siloxane Composite Layers. Catalysts. 2021; 11(1):50.

Chicago/Turabian Style

Svoboda, Tomáš, Michal Veselý, Radim Bartoš, Tomáš Homola, and Petr Dzik. 2021. "Low-Temperature Mineralisation of Titania-Siloxane Composite Layers" Catalysts 11, no. 1: 50.

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