TiO2-containing cement pastes and mortars: Measurements of the photocatalytic efficiency using a rhodamine B-based colourimetric test

Ruot, Bertrand; Plassais, A.; Olive, F.; Guillot, L.; Bonafous, Laurent

doi:10.1016/j.solener.2009.05.017

Cited by 166 publications

(85 citation statements)

References 15 publications

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“…The highest photoactivity was observed for samples with a 3% addition of TiO2−xNy and TiO2, as similarly reported by other works [10,11]. The control samples were also evaluated, to determine the catalytic reactions by photolysis or by temperature.…”

Section: Abatement Of Rhodamine Bsupporting

confidence: 79%

“…The self-cleaning ability in these kind of cements is evaluated by standard UNI 11259, using Rhodamine B as an organic dye. In this case, important results have been obtained with mortars and cement pastes, using TiO2 as addition [9][10][11]. The Rhodamine B is selected for evaluating this property in cements, mainly because it is very soluble in water, its discoloration can be followed by colorimetry and it has little sensitivity to the alkalinity of cementitious materials [10].…”

Section: Introductionmentioning

confidence: 99%

“…In this case, important results have been obtained with mortars and cement pastes, using TiO2 as addition [9][10][11]. The Rhodamine B is selected for evaluating this property in cements, mainly because it is very soluble in water, its discoloration can be followed by colorimetry and it has little sensitivity to the alkalinity of cementitious materials [10]. Additionally, the rhodamine B has polycyclic aromatic hydrocarbons in its chemical structure, compounds that are usually found as pollutants in urban environments.…”

Section: Introductionmentioning

confidence: 99%

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

2015

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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. OPEN ACCESSCoatings 2015, 5 466

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Section: Abatement Of Rhodamine Bsupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

2015

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“…The application of photocatalytic materials has increased rapidly in construction materials, trying to profit of the extensive surfaces that they can provide, for environmental protection, self-cleaning, self-sterilizing materials, antifogging mirrors and windows. The photocatalytic activity of TiO 2 enriched building materials has been reported to provide promising results for the degradation of air contaminates such as VOC (3)(4)(5), NOx (6-9) and for self cleaning (10,11) and the expectations of their possibilities increase every day. As an example, very recently, the possibility of using heterogeneous photocatalysis to diminish the allergenic airborne pollen has been reported (12).…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, is important to consider and understand the influence of the different catalyst properties on the photocatalytic activity. Additionally, as in construction activity TiO 2 can be dispersed into other materials, as cement, the influence of the interactions of both and the resulting microstructure is also important (11,(13)(14)(15).…”

Section: Introductionmentioning

confidence: 99%

Heterogeneous photocatalysis on construction materials: effect of catalyst properties on the efficiency for degrading NOx and self cleaning

Bengtsson¹,

Castellote²

2014

Mater. construcc.

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This paper analyzes the effect of some properties of different catalysts on the photocatalytic activity. The efficiency has been determined for two different processes: NOx abatement and self-cleaning for Rhodamine B and tobacco extract being, the TiO 2 based photocatalyst, supported as coatings on white mortar. Eight different catalysts were tested, seven commercial ones and one home-made catalyst with improved visible light absorption properties. Additionally, some of them were submitted to exposition to water and/or calcinations to alter their physical properties. A kinetic approach was used to evaluate the photocatalytic activity, being the first reaction constant (for NO) and just empirical constants (for self-cleaning) the parameters used for the comparison of the different materials. As a result, the efficiency, even for ranking, is dependent on the type of contaminant used in the experiment. In general, NO oxidation and tobacco followed similar trends while no clear relations were found for Rhodamine B. RESUMEN: Fotocatálisis heterogénea en materiales de construcción: efecto de las propiedades de los catalizadores en la eficiencia de degradación de NOx y autolimpieza.En este trabajo se analiza el efecto de las propiedades de distintos catalizadores en la actividad fotocatalítica de degradación de NOx y autolimpieza, para Rodamina B y extracto de tabaco. Se han ensayado ocho fotocatalizadores, basados en TiO 2 y soportados sobre mortero blanco; siete de ellos comerciales y uno sintetizado en el laboratorio con absorción mejorada en el visible. Adicionalmente, las propiedades físicas de algunos de ellos se alteraron mediante tratamientos con agua y/o por calcinación. La actividad fotocatalítica se ha evaluado mediante aproximación cinética, siendo la constante de reacción de primer orden (para NO) y constantes empíricas de ajuste (para autolimpieza) los parámetros de comparación entre materiales. Como resultado, la eficiencia depende del contaminante utilizado en el experimento de evaluación. En general, en este estudio, oxidación de NO y de extracto de tabaco presentan tendencias similares mientras para Rodamina B no se encontró correlación clara ninguna.

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Revamping an Existing Aromatics Complex with Simulated Moving‐Bed Reactor for p‐Xylene Production

Gonçalves

Rodrigues

2015

Chem Eng & Technol

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A simulated moving‐bed reactor (SMBR) for the production of p‐xylene is studied as part of a proposal to modify an existing aromatics complex in order to increase the production of benzene and p‐xylene. The proposed complex includes a single‐stage crystallization unit to further purify high p‐xylene streams from a selective toluene disproportionation and said SMBR units. Mass balances for two cases are estimated, namely, the current flow of reformate fed to the complex and a twofold flow. Results show significant increases of benzene and p‐xylene for both cases compared to the current production of the complex.

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TiO2-containing cement pastes and mortars: Measurements of the photocatalytic efficiency using a rhodamine B-based colourimetric test

Cited by 166 publications

References 15 publications

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

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

Heterogeneous photocatalysis on construction materials: effect of catalyst properties on the efficiency for degrading NOx and self cleaning

Revamping an Existing Aromatics Complex with Simulated Moving‐Bed Reactor for p‐Xylene Production

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