TiO{sub 2}-containing cement pastes and mortars: Measurements of the photocatalytic efficiency using a rhodamine B-based colourimetric test
- Universite Paris-Est, Centre Scientifique et Technique du Batiment (CSTB), Departement Enveloppe et Revetements, 24, rue Joseph Fourier, 38400 Saint-Martin-d'Heres (France)
- CTG Italcementi Group, rue des Technodes, 78931 Guerville Cedex (France)
- Axim Technology Center, P.O. Box 234, 8282 Middlebranch Road, Middlebranch, Ohio 44652 (United States)
The photocatalytic activities of cement pastes and mortars, containing various amounts of titanium dioxide (TiO{sub 2}) in the anatase form, were evaluated and compared. The density, total porosity and pore size distribution of the materials were measured, and the amount of TiO{sub 2} being at their surfaces was estimated. The photocatalytic efficiency was evaluated by monitoring the discolouration of rhodamine B applied to the surface of the materials which were then exposed to artificial sun light; this evaluation was based on the use of a dimensionless specific activity coefficient. For TiO{sub 2} contents higher than 1 wt% (up to 5 wt%), cement pastes exhibited a photocatalytic activity higher than that of mortars because their activity was roughly proportional to the TiO{sub 2} content, whereas the activity of mortars levelled off. On the other hand, the type of cement used to prepare the materials had a low effect on the photocatalytic performances. (author)
- OSTI ID:
- 21227413
- Journal Information:
- Solar Energy, Journal Name: Solar Energy Journal Issue: 10 Vol. 83; ISSN 0038-092X; ISSN SRENA4
- Country of Publication:
- United States
- Language:
- English
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