Photocatalytic activity under visible light irradiation of cement based materials containing TiO2-xNy nanoparticles




Self-cleaning cement, Nanoparticles of titanium oxynitride (TiO2−xNy), Photocatalitic activity under visible ligh, Rhodamine B abatement, Photocatalysis


Self-cleaning activity of Portland cement pastes blended with nanoparticles of titanium oxynitride (TiO2−xNy ) was studied. Samples with various amounts of TiO2−xNy (1% and 3%) were evaluated under irradiation of UV and visible light, and with two curing ages (65 hour and 28 days). Rhodamine B was the pigment used and its loss of color on the cement pastes was carried out using a Spectrometer UV/Vis measuring the coordinates CIE (Commission Internationale de l’Eclairage) L ∗ , a ∗ , b ∗ . Discoloration of Rhodamine B on the surface of the samples was established as the photocatalytic efficiency coefficient (ε). In addition, samples with TiO2 nanoparticles (1% and 3%) were studied under the same conditions and their performances were compared with TiO2-xNy . The presence of nitrogen in the tetragonal structure of TiO2 was evidenced by X-ray diffraction (XRD), ultraviolet-visible diffuse reflectance spectrophotometry and Carbon, Hydrogen and Nitrogen (CHN) analysis. The band gap for TiO2 and TiO2-xNy was determined by the transformed Kubelka-Munk function ( [F (R∞) hv] 1/2 ) . 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 in the early ages of curing time. TiO2−xNy showed activity under irradiation with visible light, unlike TiO2, which could only be activated under UV light. At the late curing ages, the samples with 3% of TiO2-xNy showed the 

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Author Biographies

Jorge I. Tobón, National University of Colombia

Cement and Construction Materials Group CEMATCO, Faculty of Mines.

Juan David Cohen, National University of Colombia

Cement and Construction Materials Group CEMATCO, Faculty of Mines.

Ludovic Dorkis, National University of Colombia

Research Group in Catalysis and Nano Materials, Faculty of Mines.


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How to Cite

Tobón, J. I., Cohen, J. D. ., & Dorkis, L. (2020). Photocatalytic activity under visible light irradiation of cement based materials containing TiO2-xNy nanoparticles. Revista Facultad De Ingeniería Universidad De Antioquia, (94), 87–96.