Reactivity of NO2 and CO2 with hardened cement paste containing activated carbon

Horgnies, Matthieu; Dubois-Brugger, Isabelle; Krou, N.J.; Batonneau−Gener, Isabelle; Belin, T.; Mignard, Samuel

doi:10.1140/epjst/e2015-02515-7

Cited by 7 publications

(5 citation statements)

References 25 publications

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“…The absence of NO 2 abatement in the reference concrete can be explained by the presence of CO 2 in the atmosphere leading to a carbonation of the surface of the walls, which tends to reduce the reactivity of NO 2 with the alkaline medium (as already shown using laboratory experiments [7], [9]). On the other hand, carbonation did not affect the NO 2 abatement detected in the garage made of depolluting concrete (supporting the previous laboratory scale measurements [7], [14]). Moreover, the solutions leached from the walls of the garages were analysed by ion chromatography after the gas absorption tests.…”

Section: Introductionsupporting

confidence: 85%

“…Indeed, the NO 2 reduction rate by the reference cement paste is affected by carbonation caused by atmospheric CO 2 : this gas converts the highly alkaline hydrates to calcium carbonates [13], which are less reactive with NO 2 . Previous laboratory-scale experiments [7], [14] showed that the addition of a small rate of activated carbon (AC, SA2 from Cabot Corp.) powder into the cement paste increases the NO 2 reduction rate (even in presence of ambient concentrations of CO 2 ) and prolongs the depolluting effect. According to these previous works, we hypothesized [7] that the NO 2 absorption in the alkaline cement pastes could be governed by two consecutive phenomena: (i) NO 2 physisorption on the activated carbon (AC) powder; and (ii) reaction of the adsorbed NO 2 with the alkaline pore solution of the surrounding cement paste, which depends on its carbonation.…”

Section: Introductionmentioning

confidence: 99%

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NO₂ AND VOCS DEPOLLUTION IN GARAGE PROTOTYPES USING INNOVATIVE CONCRETES AND MORTARS

Javierre¹,

Horgnies²,

Serre³

et al. 2017

WIT Transactions on Ecology and the Environment

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Air pollution produced by road traffic is an issue for public health and is responsible for the rise of acute respiratory diseases in urban areas. Some of the most toxic air pollutants, composed of nitrogen oxides (especially nitrogen dioxide, NO2) and volatile organic compounds (VOCs), are significantly detected in the poorly ventilated areas. The depolluting cement-based materials studied by LafargeHolcim do not rely on photo-catalysis and function without sunlight, which is especially suitable for use in polluted confined areas (such as tunnels or parking garages). The experiments carried out in the laboratory demonstrated that an addition of activated carbons into concrete and mortar improved the absorption properties of these noxious gases without affecting their mechanical properties and durability. Two parking garages of 18 m 3 were built with internal walls made of depolluting concrete (or coated by a depolluting mortar) to measure their performances. The tests conducted using a gasoline-based generator (to produce a cocktail of air pollutants) confirmed a significant reduction of the NO2 rate and noticeable abatements of certain VOCs (such as benzene and toluene).

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Section: Introductionsupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

NO₂ AND VOCS DEPOLLUTION IN GARAGE PROTOTYPES USING INNOVATIVE CONCRETES AND MORTARS

Javierre¹,

Horgnies²,

Serre³

et al. 2017

WIT Transactions on Ecology and the Environment

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“…erefore, there is a need to develop reduction technologies and management plan for ultrafine dust. While primary fine dust, generated by direct emission because of human activity or natural processes, accounts for 30% of the total fine dust generated, secondary fine dust, generated by chemical reaction with primary fine dust under certain conditions in the air, contributes to 70% of the total fine dust generated [2].…”

Section: Introductionmentioning

confidence: 99%

Production and Evaluation of Porous Photocatalyst Concrete Filter (deNOx PCF) for NOx Reduction

Park

Kim

et al. 2022

Advances in Civil Engineering

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A porous photocatalyst concrete filter (deNOx PCF) is successfully manufactured to reduce NOx by mixing TiO2 photocatalyst with lightweight aerated concrete. From the results, 4% infusion rate of each foaming agent provided the smallest change of the height, and the optimal quality of the air bubbles can be produced by using foaming agent B with 4% of infusion rate. When 3% of TiO2 photocatalyst was mixed, less irregular and relatively homogeneous pores were formed on the surface with white color due to the proper amount of photocatalyst applied. For 3% of photocatalyst mixed with deNOx PCF, 1.03 μmol/hr of NO was reduced equivalent to 10.99% of NO reduction, suggesting that the TiO2 photocatalyst dispersed in the continuous and well-developed pores inside the specimen successfully performed the removal of NO flowing through deNOx PCF using synergistic effects of adsorption and photodegradation reaction. Finally, the specimen of porous deNOx PCF for reducing NOx developed in this study can be applied to various construction sites and the air quality can be solved by reducing NOx contributing to the formation of fine particles.

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“…Numerous studies on activated carbon have primarily focused on the analyses of the correlation between the surface area and the amount adsorbed, pore volume, and the amount of adsorbed pores formed on and inside the activated carbon [ 17 , 18 , 19 ]. Horgnies et al [ 20 ] evaluated the reduction performance of NO 2 and CO 2 gas for hardened cement paste containing activated carbon. Based on the analysis results, it was confirmed that the NO 2 and CO 2 gas concentrations were reduced by reacting with activated carbon [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

“…Horgnies et al [ 20 ] evaluated the reduction performance of NO 2 and CO 2 gas for hardened cement paste containing activated carbon. Based on the analysis results, it was confirmed that the NO 2 and CO 2 gas concentrations were reduced by reacting with activated carbon [ 20 ]. Recently, foam concrete with a high connection pore and specific surface area has been receiving a significant amount of attention for higher adsorption performance.…”

Section: Introductionmentioning

confidence: 99%

Pore Structure Characteristics of Foam Composite with Active Carbon

Lee

Choi

2020

Materials

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Characterization of porous materials is essential for predicting and modeling their adsorption performance, strength, and durability. However, studies on the optimization of the pore structure to efficiently remove pollutants in the atmosphere by physical adsorption of construction materials have been insufficient. This study investigated the pore structure characteristics of foam composites. Porous foam composites were fabricated using foam composite with high porosity, open pores, and palm shell active carbon with micropores. The content was substituted 5%, 10%, 15%, and 20% by volume of cement. From the measured nitrogen adsorption isotherm, the pore structure of the foam composite was analyzed using the Brunauer–Emmett–Teller (BET) theory, Barrett–Joyner–Halenda (BJH) analysis, and Harkins-jura adsorption isotherms. From the analysis results, it was found that activated carbon increases the specific surface area and micropore volume of the foam composite. The specific surface area and micropore volume of the foam composite containing 15% activated carbon were 106.48 m2/g and 29.80 cm3/g, respectively, which were the highest values obtained in this study. A foam composite with a high micropore volume was found to be effective for the adsorption of air pollutants.

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Reactivity of NO2 and CO2 with hardened cement paste containing activated carbon

Cited by 7 publications

References 25 publications

NO₂ AND VOCS DEPOLLUTION IN GARAGE PROTOTYPES USING INNOVATIVE CONCRETES AND MORTARS

NO₂ AND VOCS DEPOLLUTION IN GARAGE PROTOTYPES USING INNOVATIVE CONCRETES AND MORTARS

Production and Evaluation of Porous Photocatalyst Concrete Filter (deNOx PCF) for NOx Reduction

Pore Structure Characteristics of Foam Composite with Active Carbon

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Reactivity of NO2 and CO2 with hardened cement paste containing activated carbon

Cited by 7 publications

References 25 publications

NO2 AND VOCS DEPOLLUTION IN GARAGE PROTOTYPES USING INNOVATIVE CONCRETES AND MORTARS

NO2 AND VOCS DEPOLLUTION IN GARAGE PROTOTYPES USING INNOVATIVE CONCRETES AND MORTARS

Production and Evaluation of Porous Photocatalyst Concrete Filter (deNOx PCF) for NOx Reduction

Pore Structure Characteristics of Foam Composite with Active Carbon

Contact Info

Product

Resources

About

NO₂ AND VOCS DEPOLLUTION IN GARAGE PROTOTYPES USING INNOVATIVE CONCRETES AND MORTARS

NO₂ AND VOCS DEPOLLUTION IN GARAGE PROTOTYPES USING INNOVATIVE CONCRETES AND MORTARS