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Synthesis of thin titania coatings onto the inner surface of quartz tubes and their photoactivity in decomposition of methylene blue and rhodamine B

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Svetlov, Stanislav, Sladkovskiy, Dmitry A., Semikin, Kirill, Utemov, Alexander, Abiev, Rufat and Rebrov, Evgeny V. (2021) Synthesis of thin titania coatings onto the inner surface of quartz tubes and their photoactivity in decomposition of methylene blue and rhodamine B. Catalysts, 11 (12). 1538. doi:10.3390/catal11121538

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Official URL: https://doi.org/10.3390/catal11121538

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Abstract

An evaporation-deposition coating method for coating the inner surface of long (>1 m) quartz tubes of small diameter has been studied by the introduction of two-phase (gas-liquid) flow with the gas core flowing in the middle and a thin liquid film of synthesis sol flowing near the hot tube wall. The operational window for the deposition of continuous titania coatings has been obtained. The temperature range for the deposition of continuous titania coatings is limited to 105–120 °C and the gas flow rate is limited to the range of 0.4–1.0 L min−1. The liquid flow rate in the annular flow regime allows to control the coating thickness between 3 and 10 micron and the coating porosity between 10% and 20%. By increasing the liquid flow rate, the coating porosity can be substantially reduced. The coatings were characterized by X-ray diffraction, N2 chemisorption, thermogravimetric analysis, and scanning electron microscopy. The coatings were tested in the photocatalytic decomposition of methylene blue and rhodamine B under UV-light and their activity was similar to that of a commercial P25 titania catalyst.

Item Type: Journal Article
Subjects: T Technology > TD Environmental technology. Sanitary engineering
T Technology > TK Electrical engineering. Electronics Nuclear engineering
T Technology > TP Chemical technology
Divisions: Faculty of Science > Engineering
Library of Congress Subject Headings (LCSH): Titanium compounds, Catalysts , Semiconductors, Gas-liquid interfaces
Journal or Publication Title: Catalysts
Publisher: MDPI
ISSN: 2073-4344
Official Date: 16 December 2021
Dates:
DateEvent
16 December 2021Published
13 December 2021Accepted
Volume: 11
Number: 12
Article Number: 1538
DOI: 10.3390/catal11121538
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
20-69-46041Russian Science Foundationhttp://dx.doi.org/10.13039/501100006769

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