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Geopolymer-supported photocatalytic TiO2 film: Preparation and characterization
HighlightsTiO2 films are chemically coated onto porous geopolymer substrates.A modified sol-gel dip coating method is used to relieve cracking and improve morphology of TiO2 films.TiO2 film prepared under proper processing conditions exhibits good photocatalytic efficiency.
AbstractThe article reports preparation and characteristics of TiO2 films deposited on geopolymer substrates via sol-gel dip coating process. Serious cracking takes place within TiO2 film derived from sol precursor with butyl titanate as titanium source and prepared by traditional dip-coating process on geopolymer substrates. It is found that the incorporation of 6% Polyvinylpyrrolidone, and the application of vacuum impregnation before withdrawing relieve cracking significantly, and the resulting TiO2 film exhibits mesoporous morphology. The TiO2 film annealed at 600°C is mainly composed of anatase phase, and exhibits highest photocatalytic activity evaluated by degrading methylene blue. Multilayer dip-coating promotes photocatalytic activity of the obtained TiO2 film in some extent, but decreases in photocatalytic efficiency and homogeneity are observed when the number of coating layers is over 3.
Geopolymer-supported photocatalytic TiO2 film: Preparation and characterization
HighlightsTiO2 films are chemically coated onto porous geopolymer substrates.A modified sol-gel dip coating method is used to relieve cracking and improve morphology of TiO2 films.TiO2 film prepared under proper processing conditions exhibits good photocatalytic efficiency.
AbstractThe article reports preparation and characteristics of TiO2 films deposited on geopolymer substrates via sol-gel dip coating process. Serious cracking takes place within TiO2 film derived from sol precursor with butyl titanate as titanium source and prepared by traditional dip-coating process on geopolymer substrates. It is found that the incorporation of 6% Polyvinylpyrrolidone, and the application of vacuum impregnation before withdrawing relieve cracking significantly, and the resulting TiO2 film exhibits mesoporous morphology. The TiO2 film annealed at 600°C is mainly composed of anatase phase, and exhibits highest photocatalytic activity evaluated by degrading methylene blue. Multilayer dip-coating promotes photocatalytic activity of the obtained TiO2 film in some extent, but decreases in photocatalytic efficiency and homogeneity are observed when the number of coating layers is over 3.
Geopolymer-supported photocatalytic TiO2 film: Preparation and characterization
Chen, Lou (author) / Zheng, Keren (author) / Liu, Yang (author)
Construction and Building Materials ; 151 ; 63-70
2017-06-16
8 pages
Article (Journal)
Electronic Resource
English
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