Degradation of NO using photocatalytic coatings applied to different substrates

Martinez, Thomas; Bertron, Alexandra; Ringot, Erick; Escadeillas, Gilles

doi:10.1016/j.buildenv.2011.03.001

Cited by 132 publications

(88 citation statements)

References 27 publications

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“…45,52,53,56,60,63 Consequently, the NO surface concentration is related to the respective gas-phase concentration by…”

Section: Discussionmentioning

confidence: 99%

“…Such a decrease of the reaction rate with increasing concentration of water in the gas phase was in fact reported by several authors. 45,52,53,56,60,63 The rate law presented in eqn (19) was used to analyse kinetic data recently published by Hunger et al 60 (see ESI, † Part III). A good agreement between experimental and calculated data is observed (ESI, † Fig.…”

Section: Discussionmentioning

confidence: 99%

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Light intensity dependence of the kinetics of the photocatalytic oxidation of nitrogen(ii) oxide at the surface of TiO2

Dillert

Engel

Große

et al. 2013

Phys. Chem. Chem. Phys.

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Air pollution by nitrogen oxides represents a serious environmental problem in urban areas where numerous sources of these pollutants are concentrated. One approach to reduce the concentration of these air pollutants is their light-induced oxidation in the presence of molecular oxygen and a photocatalytically active building material which uses titanium dioxide as the photocatalyst. Herein, results of an investigation concerning the influence of the photon flux and the pollutant concentration on the rate of the photocatalytic oxidation of nitrogen(II) oxide in the presence of molecular oxygen and UV(A) irradiated titanium dioxide powder are presented. A Langmuir-Hinshelwood-type rate law for the photocatalytic NO oxidation inside the photoreactor comprising four kinetic parameters is derived being suitable to describe the influence of the pollutant concentration and the photon flux on the rate of the photocatalytic oxidation of nitrogen(II) oxide.

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“…45,52,53,56,60,63 Consequently, the NO surface concentration is related to the respective gas-phase concentration by…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Light intensity dependence of the kinetics of the photocatalytic oxidation of nitrogen(ii) oxide at the surface of TiO2

Dillert

Engel

Große

et al. 2013

Phys. Chem. Chem. Phys.

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“…However the reduction was not maximized, caused by the degradation process's being carried out in a closed reactor, thereby limiting the amount of oxygen involved. Martinez et al (2011) conducted previous research on reactive species of oxygen deficiency due to the fact that sufficient moisture in the air inhibits NO photocatalytic degradation at high pollutant concentrations. Figure 7 shows that the CN-TiO 2 -450/PS catalyst has lower photocatalytic activity than does CN-TiO 2 -350/PS in the degradation of MCH, even when it is compared to P25/PS.…”

Section: Photocatalytic Degradation Of Mchmentioning

confidence: 99%

Photodegradation of Methylcyclohexane in Two Phases with Modified-titania Immobilized on Pumice

Slamet

Oktrianto

Hendarsa

et al. 2017

IJTech

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The photocatalytic degradation of methylcyclohexane (MCH) in two phases (aqueous and vapor) was examined using modified titania that was immobilized on pumice and performed in the system of a specific condition. The photodegradation system that used a particular configuration reactor and modified catalyst could facilitate the two-phase photodegradation of MCH simultaneously. The photocatalyst was prepared by the mechanical mixing of urea and TiO 2 P25 with mass ratios of 1:3 and 2:3, respectively and then calcined at 350 and 450 o C. This modified photocatalyst was then immobilized on pumice and finally used for the photodegradation of MCH. The Infrared spectra studies revealed that modified titania with urea successfully incorporated a non-metal dopant within the TiO 2 lattice. The catalyst that spread evenly across the surface of the pumice can be seen from Scanning Electron Microscope (SEM) characterization. The loading of 7.5% mass photocatalyst that immobilized on pumice degraded MCH in two-phases simultaneously during a 120 minute period and can be considered the optimum condition.

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“…In recent years, many studies in the literature have been devoted to understand and improve the degradation of NO x by photocatalysis using TiO 2 -containing materials (TiO 2 is used as an additive and mixed with cement and concrete) or TiO 2 -based dispersions (TiO 2 is used as a coating such as glaze and paint). Focus has especially been made on the NO x photocatalytic oxidation mechanism [15,18], the factors affecting the photocatalysis process [19][20][21][22], the experimental setup at a laboratory scale [23][24][25][26][27][28], and the development of photocatalysts active under visible light and the photocatalysis efficiency at real scale [29][30][31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

“…However, the reported photocatalytic degradation efficiency may vary from one study to another depending on the experimental conditions and the scale of the experiment. The air purification ability of TiO 2 is commonly studied at laboratory scale using flow-type reactors with different geometries and modes of operation simulating various environmental parameters [15,16,20,23,36]. A consensus between researchers was established, and a standardized experimental apparatus was defined to allow the performance of photocatalytic samples to be compared and also to identify the important parameters coming into play [5,25,26].…”

Section: Introductionmentioning

confidence: 99%

Investigation on Parameters Affecting the Effectiveness of Photocatalytic Functional Coatings to Degrade NO: TiO₂ Amount on Surface, Illumination, and Substrate Roughness

Hot

Topalov

Ringot

et al. 2017

International Journal of Photoenergy

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This paper deals with the degradation of NO by photocatalytic oxidation using TiO 2 -based coatings. Tests are conducted at a laboratory scale through an experimental setup inspired from ISO 22197-1 standard. Various parameters are explored to evaluate their influence on photocatalysis efficiency: TiO 2 dry matter content applied to the surface, nature of the substrate, and illumination conditions (UV and visible light). This article points out the different behaviors between three kinds of substrates which are common building materials: normalized mortar, denser mortar, and commercial wood. The illumination conditions are of great importance in the photocatalytic process with experiments under UV light showing the best results. However, a significant decrease in NO concentration under visible light is also observed provided that the TiO 2 dry matter content on the surface is high enough. The nature of the substrate plays an important role in the photocatalytic activity with rougher substrates being more efficient to degrade NO. However, limiting the roughness of the substrate seems to be of utmost interest to obtain the highest exposed surface area and thus the optimal photocatalytic efficiency. A higher roughness promotes the surface contact between TiO 2 and NO but does not necessarily increase the photochemical oxidation.

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Degradation of NO using photocatalytic coatings applied to different substrates

Cited by 132 publications

References 27 publications

Light intensity dependence of the kinetics of the photocatalytic oxidation of nitrogen(ii) oxide at the surface of TiO2

Light intensity dependence of the kinetics of the photocatalytic oxidation of nitrogen(ii) oxide at the surface of TiO2

Photodegradation of Methylcyclohexane in Two Phases with Modified-titania Immobilized on Pumice

Investigation on Parameters Affecting the Effectiveness of Photocatalytic Functional Coatings to Degrade NO: TiO₂ Amount on Surface, Illumination, and Substrate Roughness

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Degradation of NO using photocatalytic coatings applied to different substrates

Cited by 132 publications

References 27 publications

Light intensity dependence of the kinetics of the photocatalytic oxidation of nitrogen(ii) oxide at the surface of TiO2

Light intensity dependence of the kinetics of the photocatalytic oxidation of nitrogen(ii) oxide at the surface of TiO2

Photodegradation of Methylcyclohexane in Two Phases with Modified-titania Immobilized on Pumice

Investigation on Parameters Affecting the Effectiveness of Photocatalytic Functional Coatings to Degrade NO: TiO2 Amount on Surface, Illumination, and Substrate Roughness

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Investigation on Parameters Affecting the Effectiveness of Photocatalytic Functional Coatings to Degrade NO: TiO₂ Amount on Surface, Illumination, and Substrate Roughness