Photoactive polymer-cement composites for tannins removal from wastewaters

Baltes, Liana; Paţachia, Silvia; Țierean, Mircea Horia; Ekincioglu, Ozgur; Özkul, M. Hulusi

doi:10.1016/j.jece.2018.06.039

Cited by 5 publications

(1 citation statement)

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“…A recent application is the mixture of photocatalytic solids with building material, which provide a new method for the removal of pollutants from air. This mixture can provide properties such as self-cleaning [1], purification, depollution capacity [2,3] and self-disinfecting [4,5]. Perhaps, the most studied photocatalyst material is the titanium dioxide (TiO 2 ) [6], even with a band gap of 3.2 eV (for anatase phase), that makes that TiO 2 needs to be activated under ultraviolet light [7].…”

Section: Introductionmentioning

confidence: 99%

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

Tobón

Cohen

Dorkis

2019

Rev.Fac.Ing.Univ.Antioquia

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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 highest efficiency under irradiation of UV and visible light.

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