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  4. Photocatalytic Discoloration of Organic Compounds on Outdoor Building Cement Panels Modified by Photoactive Coatings
 
research article

Photocatalytic Discoloration of Organic Compounds on Outdoor Building Cement Panels Modified by Photoactive Coatings

Yuranova, T
•
Sarria, V  
•
Jardim, W
Show more
2007
Journal of Photochemistry and Photobiology A - Chemistry

Cement based Eternit plates modified by TiO2/SiO2 surface layers acquired self-cleaning properties. The TiO2/SiO2 coating was transparent indicating that the small TiO2 (rutile) crystals cause no significant scattering. The parameters related to the composition of the TiO2/SiO2 coating were investigated in relation to concentration and ratio of the components and the time and temperature necessary for the colloid networking to produce the self-cleaning effect. The repetitive discoloration of natural pigments on the TiO2/SiO2/Eternit plates was observed showing the stable performance of the TiO2/SiO2 coating. FTIR spectroscopy shows the stability of the acrylic and cellulose components on the TiO2/SiO2/Eternit plates after repetitive self-cleaning cycles. A self-cleaning mechanism is suggested in agreement with the experimental findings. The SiO2 layers seem to avoid the radical attack on the acrylic topmost layers of the Eternit plates due to the TiO2 (h(vb)(+)) generated under solar simulated radiation. The profile and thickness of the coating was estimated by confocal microscopy. X-ray diffraction showed that the Eternit plates had a structure forming function on the TiO2/SiO2 layers leading to the formation of rutile from the Ti-colloids at temperatures as low as similar to 80 degrees C. (C) 2007 Elsevier B.V. All rights reserved.

  • Details
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Type
research article
DOI
10.1016/j.jphotochem.2006.12.032
Web of Science ID

WOS:000246738900027

Author(s)
Yuranova, T
Sarria, V  
Jardim, W
Rengifo, J
Pulgarin, C  
Trabesinger, G
Kiwi, J
Date Issued

2007

Published in
Journal of Photochemistry and Photobiology A - Chemistry
Volume

188

Issue

2-3

Start page

334

End page

341

Subjects

self-cleaning

•

cement panels/plates

•

daylight radiation

•

SiO2/TiO2 colloids

•

DYE ORANGE-II

•

LOW-TEMPERATURES

•

DAYLIGHT IRRADIATION

•

FENTON DEGRADATION

•

TIO2

•

FILMS

•

TEXTILES

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
GPAO  
Available on Infoscience
February 12, 2007
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/2418
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