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Large scale production of photocatalytic TiO2 coating for volatile organic compound (VOC) air remediation

1 Department of Chemical Engineering – Nanomaterials, Catalysis & Electrochemistry, University of Liège, B6a, Quartier Agora, Allée du six Août 11, 4000 Liège, Belgium
2 AC&CS – CRM GROUP, B57, Quartier Polytech 3, Allée de l’Innovation 1, 4000 Liège, Belgium

Special Issues: Photocatalytic

In this work, a pure TiO2 colloid was produced at pilot scale of 5 L and deposited on stainless steel with a pilot roll-to-roll line to produce photocatalytic coating for VOC degradation. The pure TiO2 colloid was synthesized with an aqueous sol–gel process, producing crystalline nanoparticles around 4–5 nm (mainly anatase phase) dispersed in water. The crystalline phases were produced at low temperature (<100 ℃) without calcination step. The crystalline coating produced with roll-to-roll process was very thin, around 50 nm. The photoactivity of this coating towards VOC destruction was evaluated on the degradation of acetaldehyde; the measured activity of the coating was 35 ± 5%. With the use of mass spectrometer, it was shown that acetaldehyde was mainly converted in CO2. The durability of the coating was assessed after 1, 2 and 3 weeks, and showed that the photoactivity stayed constant for this period.
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Keywords aqueous TiO2; colloid; sol–gel process; pilot scale coating; photocatalysis; acetaldehyde degradation

Citation: Julien G. Mahy, Stéphanie D. Lambert, Jérémy Geens, Alain Daniel, David Wicky, Catherine Archambeau, Benoît Heinrichs. Large scale production of photocatalytic TiO2 coating for volatile organic compound (VOC) air remediation. AIMS Materials Science, 2018, 5(5): 945-956. doi: 10.3934/matersci.2018.5.945


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