Functionalized building materials: Photocatalytic abatement of NOx by cement pastes blended with TiO2 nanoparticles

Cárdenas, Carolina; Tobón, Jorge Iván; García, Claudia; Vila, Jaume

doi:10.1016/j.conbuildmat.2012.06.017

Cited by 95 publications

(51 citation statements)

References 13 publications

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“…It is well known that the cement industry is responsible for the emission of high levels of pollutants, such as nitrogen oxides (NO x ) and carbon dioxide (CO 2 ), which has resulted in an emerging need for environmental regulations to stimulate the development of new strategies to lessen the polluting agents (Cárdenas, Tobón, García, & Vila, 2012). In this respect, combining TiO 2 nanoparticles with cement-based construction materials seems to be a good solution, due to its strong photocatalytic activity, which results in (i) an environmental pollution remediation, (ii) self-cleaning and self-disinfection, (iii) high stability and (iv) relatively low cost (Hashimoto, Irie, & Fujishima, 2005).…”

Section: Nanotitanium Dioxidementioning

confidence: 99%

Review on concrete nanotechnology

Silvestre

Brito

2015

European Journal of Environmental and Civil Engineering

176

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Section: Nanotitanium Dioxidementioning

confidence: 99%

Review on concrete nanotechnology

Silvestre

Brito

2015

European Journal of Environmental and Civil Engineering

176

View full text Add to dashboard Cite

“…In absolute terms, w-CAC (Fig. 6b) was more effective than d-CAC ( based compounds is well known [36,37], in the case of PC samples, an increase of the NO 2 concentration is usually reported as a consequence of the fast photochemical oxidation of NO [7,9,10,38]. Although the main part of this NO 2 formed is expected to be later oxidized to nitrate ions, the amount of NO 2 evolved and not oxidized could be significant.…”

Section: Assessment Of the Photocatalytic Efficiencymentioning

confidence: 99%

“…Besides, certain amounts of NO 2 -produced in the photocatalytic process (reaction 6) -have been reported to be evolved and unretained by the PC systems. These amounts of released NO 2 partially counteract the photocatalytic efficiency [7,9,10]. [11].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic NOx abatement by calcium aluminate cements modified with TiO2: Improved NO2 conversion

Perez-Nicolas

Balbuena

Cruz-Yusta

et al. 2015

Cement and Concrete Research

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Photocatalytic activity of TiO 2 was studied in two types of Calcium Aluminate Cement (CAC) under two different curing regimes. The effect of the TiO 2 addition on the setting time, consistency and mechanical properties of the CACs was evaluated. The abatement of gaseous pollutants (NO x ) under UV irradiation was also assessed. These cementitious matrices were found to successfully retain NO 2 : more abundant presence of aluminates in white cement (w-CAC, iron-lean) helped to better adsorb NO 2 , thus improving the conversion performance of the catalyst resulting in a larger NO x removal under UV irradiation. As evidenced by XRD, SEM, EDAX and zeta potential analyses, the presence of ferrite in dark cement (d-CAC, iron-reach) induced a certain chemical interaction with TiO 2 . The experimental findings suggest the formation of new iron titanate phases, namely pseudobrookite. The reduced band-gap energy of these compounds compared with that of TiO 2 accounts for the photocatalytic activity of these samples.

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“…The use of TiO2 is due to its low toxicity and high stability compared to other semiconductors studied for this application (ZnO, CdS, WO3) [6]. The NOx abatement has been evaluated for cement pastes added with TiO2 nanoparticles at different ratios of rutile and anatase [7]. In this same way, there has been reported the mineralization of different VOCs (Volatile Organic Compounds) by means of building materials added with TiO2 [8].…”

Section: Introductionmentioning

confidence: 99%

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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Functionalized building materials: Photocatalytic abatement of NOx by cement pastes blended with TiO2 nanoparticles

Cited by 95 publications

References 13 publications

Review on concrete nanotechnology

Review on concrete nanotechnology

Photocatalytic NOx abatement by calcium aluminate cements modified with TiO2: Improved NO2 conversion

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

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