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Journal of Sol-Gel Science and Technology

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16-01-2021 | Original Paper: Functional coatings, thin films and membranes (including deposition techniques)

Enhancing photocatalytic ability of TiO₂ films using gel-derived P/Si-TiO₂ powder

Authors: Hsuan-Fu Yu, Chao-Wei Cheng

Published in: Journal of Sol-Gel Science and Technology | Issue 2/2021

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Abstract

P/Si-TiO₂ photocatalytic thick films on FTO glass substrates were prepared. TiO₂ thin films, as base layer, were first coated on substrates using a spin-coating technique. The slurry containing P/Si-TiO₂ nanoparticles was bar-coated on the surface of TiO₂ base layer, followed by calcining at 550 °C. The resultant films were characterized using x-ray diffractometer, scanning electron microscope, UV–Vis spectrophotometer, crosscut adhesion test, and recycling-use test. Under 365-nm UV-light irradiation, abilities of the films to photocatalytically degrade methylene blue were evaluated. The apparent rate laws obeyed 1st-order and the corresponding reaction rate constants (k′), based on the coated area of substrates, were estimated. k′ of the thick film (thickness: 6.5 μm; composition: P/Si-TiO₂ anatase crystallites with 16 nm average size) was 49.0 L/(m²-sub. h), which was about eight times of that of the thin film (k′ = 6.2 L/(m²-sub. h); thickness: 215 nm; composition: pure TiO₂ anatase crystallites with 8-nm average size).

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Title: Enhancing photocatalytic ability of TiO2 films using gel-derived P/Si-TiO2 powder
Authors: Hsuan-Fu Yu
Chao-Wei Cheng
Publication date: 16-01-2021
Publisher: Springer US
Published in: Journal of Sol-Gel Science and Technology / Issue 2/2021
Print ISSN: 0928-0707
Electronic ISSN: 1573-4846
DOI: https://doi.org/10.1007/s10971-020-05450-5

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