Photocatalytic activity under visible light irradiation of cement based materials containing TiO2-xNy nanoparticles
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| Format: | Artículo científico |
| Langue: | en |
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Universidad de Antioquia
2020
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| _version_ | 1876463550662180864 |
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| author | Jorge I. Tobón |
| author_facet | Jorge I. Tobón |
| contents | Photocatalytic activity under visible light irradiation of cement based materials containing TiO2-xNy nanoparticles Jorge I. Tobón Juan D. Cohen Ludovic Dorkis Ingeniería Self photocatalysis cleaning cement rhodamine B abatement photocatalitic activity under visible light Self-cleaning activity of Portland cement pastes blended with nanoparticles of titanium oxynitride (TiO 2−x N y ) was studied. Samples with various amounts of TiO 2−x N y (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∞) hv1/2). 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. TiO 2−x N y 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 highest efficiency under irradiation of UV and visible light. 2020 artículo científico 0120-6230 https://www.redalyc.org/articulo.oa?id=43062873009 https://www.redalyc.org/journal/430/43062873009/ https://www.redalyc.org/journal/430/43062873009/html/ https://www.redalyc.org/journal/430/43062873009/43062873009.epub https://www.redalyc.org/journal/430/43062873009/movil 10.17533/udea.redin.20190730 en http://www.redalyc.org/revista.oa?id=430 Revista Facultad de Ingeniería Universidad de Antioquia application/pdf Universidad de Antioquia Revista Facultad de Ingeniería Universidad de Antioquia (Colombia) Num.94 |
| format | Artículo científico |
| id | redalyc_43062873009 |
| institution | Redalyc |
| language | en |
| publishDate | 2020 |
| publisher | Universidad de Antioquia |
| spellingShingle | Photocatalytic activity under visible light irradiation of cement based materials containing TiO2-xNy nanoparticles Jorge I. Tobón Ingeniería Self photocatalysis cleaning cement rhodamine B abatement photocatalitic activity under visible light Photocatalytic activity under visible light irradiation of cement based materials containing TiO2-xNy nanoparticles Jorge I. Tobón Juan D. Cohen Ludovic Dorkis Ingeniería Self photocatalysis cleaning cement rhodamine B abatement photocatalitic activity under visible light Self-cleaning activity of Portland cement pastes blended with nanoparticles of titanium oxynitride (TiO 2−x N y ) was studied. Samples with various amounts of TiO 2−x N y (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∞) hv1/2). 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. TiO 2−x N y 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 highest efficiency under irradiation of UV and visible light. 2020 artículo científico 0120-6230 https://www.redalyc.org/articulo.oa?id=43062873009 https://www.redalyc.org/journal/430/43062873009/ https://www.redalyc.org/journal/430/43062873009/html/ https://www.redalyc.org/journal/430/43062873009/43062873009.epub https://www.redalyc.org/journal/430/43062873009/movil 10.17533/udea.redin.20190730 en http://www.redalyc.org/revista.oa?id=430 Revista Facultad de Ingeniería Universidad de Antioquia application/pdf Universidad de Antioquia Revista Facultad de Ingeniería Universidad de Antioquia (Colombia) Num.94 |
| title | Photocatalytic activity under visible light irradiation of cement based materials containing TiO2-xNy nanoparticles |
| topic | Ingeniería Self photocatalysis cleaning cement rhodamine B abatement photocatalitic activity under visible light |
| url | https://www.redalyc.org/articulo.oa?id=43062873009 https://www.redalyc.org/journal/430/43062873009/ https://www.redalyc.org/journal/430/43062873009/html/ https://www.redalyc.org/journal/430/43062873009/43062873009.epub https://www.redalyc.org/journal/430/43062873009/movil |