1. Photocatalytic Activity of Multicompound TiO 2 /SiO 2 Nanoparticles.
- Author
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Temerov, Filipp, Haapanen, Janne, Mäkelä, Jyrki M., and Saarinen, Jarkko J.
- Subjects
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PHOTOCATALYSTS , *CONTACT angle , *FLAME spraying , *CARBON dioxide , *NANOPARTICLES - Abstract
Multicompound TiO2/SiO2 nanoparticles with a diameter of 50–70 nm were generated using a liquid flame spray (LFS) nanoparticle deposition in a single flame. Here, we study the photocatalytic activity of deposited multicompound nanoparticles in gas-phase via oxidation of acetylene into carbon dioxide that gives new insight about the multicompound nanoparticle morphology. A small addition of SiO2 content of 0.5%, 1.0% and 3.0% significantly suppressed the photocatalytic activity by 33%, 44% and 70%, respectively, whereas 5.0% SiO2 addition completely removed the activity. This may be due to a formation of a thin passivating SiO2 layer on top of the of the TiO2 nanostructures during the LFS nanoparticle deposition. Surface wetting results support this hypothesis with a significant increase in water contact angle as the SiO2 content is increased. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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