Photocatalytic degradation of gaseous pollutants on nanostructured TiO2 films of various thickness and surface area
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Date
2023-04-01
Authors
Baudys, Michal
Berthet, Eleonore
Macák, Jan
Lhotka, Miloslav
Krýsa, Josef
ORCID
0000-0001-7091-3022Advisor
Referee
Mark
Journal Title
Journal ISSN
Volume Title
Publisher
Springer Nature
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Abstract
This work deals with the preparation of TiO2 nanoparticulate layers of various mass (0.05 mg/cm(2) to 2 mg/cm(2)) from three commercial nanopowder materials, P90, P25 and CG 300, their characterisation (profilometry, BET and SEM) and evaluation of their photocatalytic activity in the gaseous phase in a flow-through photoreactor according to the ISO standard (ISO 22197-2). Hexane was chosen as a single model pollutant and a mixture of four compounds, namely acetaldehyde, acetone, heptane and toluene was used for the evaluation of the efficiency of simultaneous removal of several pollutants. A linear dependence between the layer mass and the layer thickness for all materials was found. Up to a layer mass 0.5 mg/cm(2), the immobilisation P90 and P25 powder did not result in a decrease in BET surface area, whereas with an increase in layer mass to 1 mg/cm(2), a decrease of the BET surface was observed, being more significant in the case of P90. The photocatalytic conversion of hexane was comparable for all immobilised powders up to a layer mass of 0.5 mg/cm(2). For higher layer mass, the photocatalytic conversion of hexane on P25 and P90 differ; the latter achieved about 30% higher conversion. In the case of the simultaneous degradation of four compounds, acetaldehyde was degraded best, followed by acetone and toluene; the least degraded compound was heptane. The measurement of released CO2 revealed that 90% of degraded hexane was mineralised to CO2 and water while for a mixture of 4 VOCs, the level of mineralisation was 83%.
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Citation
Photochemical and Photobiological Sciences. 2023, vol. 22, issue 4, p. 883-892.
https://link.springer.com/article/10.1007/s43630-022-00359-0
https://link.springer.com/article/10.1007/s43630-022-00359-0
Document type
Peer-reviewed
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en