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Coatings 2015, 5(3), 465-476; doi:10.3390/coatings5030465

Evaluation of Photocatalytic Properties of Portland Cement Blended with Titanium Oxynitride (TiO2−xNy) Nanoparticles

1
Grupo del Cemento y Materiales de Construción CEMATCO, Universidad Nacional de Colombia, Facultad de Minas, 05001000 Medellín, Colombia
2
Grupo Investigación en catálisis y nano materiales, Universidad Nacional de Colombia, Facultad de Minas, 05001000 Medellín, Colombia
*
Author to whom correspondence should be addressed.
Academic Editor: Anibal Maury-Ramirez
Received: 1 April 2015 / Revised: 22 July 2015 / Accepted: 24 July 2015 / Published: 31 July 2015
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Abstract

Photocatalytic activity of Portland cement pastes blended with nanoparticles of titanium oxynitride (TiO2−xNy) was studied. Samples with different percentages of TiO2−xNy (0.0%, 0.5%, 1%, 3%) and TiO2 (1%, 3%) were evaluated in order to study their self-cleaning properties. The presence of nitrogen in the tetragonal structure of TiO2 was evidenced by X-ray diffraction (XRD) as a shift of the peaks in the 2θ axis. The samples were prepared with a water/cement ratio of 0.5 and a concentration of Rhodamine B of 0.5 g/L. After 65 h of curing time, the samples were irradiated with UV lamps to evaluate the reduction of the pigment. The color analysis was carried out using a Spectrometer UV/Vis measuring the coordinates CIE (Commission Internationale de l’Eclairage) L*, a*, b*, and with special attention to the reddish tones (Rhodamine B color) which correspond to a* values greater than zero. Additionally, samples with 0.5%, 1%, 3% of TiO2−xNy and 1%, 3% of TiO2 were evaluated under visible light with the purpose of determining the Rhodamine B abatement to wavelengths greater than 400 nm. The results have shown a similar behavior for both additions under UV light irradiation, with 3% being the addition with the highest photocatalytic efficiency obtained. However, TiO2−xNy showed activity under irradiation with visible light, unlike TiO2, which can only be activated under UV light. View Full-Text
Keywords: photocatalysis heterogeneous; Portland cement; self-cleaning; nanoparticles of titanium oxynitride (TiO2−xNy); degradation of rhodamine B; UV light photocatalysis heterogeneous; Portland cement; self-cleaning; nanoparticles of titanium oxynitride (TiO2−xNy); degradation of rhodamine B; UV light
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Cohen, J.D.; Sierra-Gallego, G.; Tobón, J.I. Evaluation of Photocatalytic Properties of Portland Cement Blended with Titanium Oxynitride (TiO2−xNy) Nanoparticles. Coatings 2015, 5, 465-476.

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