Photocatalytic degradation of NO/NO2 gas injected into a 10-m3 experimental chamber

Hot, Julie; Martinez, Thomas; Wayser, Barnabé; Ringot, Erick; Bertron, Alexandra

doi:10.1007/s11356-016-7701-2

Cited by 15 publications

(14 citation statements)

References 21 publications

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“…In fact, no significant difference was noticed between tests carried out with and without photocatalytic material on the walls. This observation is in accordance with research work reported in the literature showing that NO has no adsorption properties (Maggos et al 2007;Maggos et al 2008;Hot, Martinez et al 2017). The NO and NO 2 concentrations obtained over 240 min in the dark are given in Figure 6.…”

Section: Nox Concentrations Without Photocatalysissupporting

confidence: 92%

“…However, experiments carried out under such conditions are not very realistic representations of actual applications, where photocatalytic coatings are applied on large existing surfaces, and some authors have worked on this problem. Assessing PCO efficiency towards air pollution under real-world conditions is a tricky task and only a few studies on this subject have been published so far (Maggos et al 2007;Maggos et al 2008;Gallus et al 2015;Hot, Martinez, et al 2017;Chen & Chu 2011;Crain et al 2016;Horgnies et al 2015;Guerrini 2012). Moreover, only a handful of them are related to indoor air.…”

Section: Introductionmentioning

confidence: 99%

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In situ NO abatement by photocatalysis—study under continuous NO injection in a 10-m3 experimental chamber

Topalov

Hot

Ringot

et al. 2018

Air Qual Atmos Health

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Air pollution is a serious public health concern in France and many other countries. Nitrogen oxides (NO x) include nitrogen monoxide (NO) and nitrogen dioxide (NO 2). They are mainly outdoor pollutants produced during combustion of fossil fuel. These gases can easily infiltrate buildings and thus increase indoor pollution. The recommended guideline values for NO 2 are 200 µg/m 3 (short-term exposure) and 40 µg/m 3 (long-term exposure). Although no guideline values exist for NO, this gas can be oxidized by atmospheric ozone and thus produce NO 2. This paper studies the depollution efficiency of photocatalysis towards indoor NO. Experiments were conducted at real scale, in a 10-m 3 experimental chamber developed at the LMDC and used as a reactor. The interior walls of the chamber were equipped with painted plasterboards treated with photocatalytic coating (3 g/m² of TiO 2). Gas was continuously injected into the chamber according to a specific procedure: (1) pollutant injection at high flow rate to reach 200 ppb of NO, (2) pollutant injection at low flow rate in order to keep the NO concentration constant at 200±10 ppb, and (3) photocatalysis activation by switching on the light. Typical indoor lighting systems (fluorescent tubes, LED and halogen bulbs) were tested and UV fluorescent tubes were also used to optimise the photocatalytic efficiency. Results showed that NO indoor concentration was reduced by photocatalysis in real-world conditions. Significant NO degradation was obtained under visible light. In addition, using the experimental procedure presented in this paper, a new method for evaluating air depollution efficiency by photocatalysis at real scale is proposed.

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Section: Nox Concentrations Without Photocatalysissupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

In situ NO abatement by photocatalysis—study under continuous NO injection in a 10-m3 experimental chamber

Topalov

Hot

Ringot

et al. 2018

Air Qual Atmos Health

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“…DtoxGuard R Int coating was also used in a previous study, in which it was applied to the walls (a surface of 9.3 m 2 was covered) in a 10-m 3 experimental chamber. The authors reported high NO degradation rates under UV and visible light [37,38] .…”

Section: Likelihood Analysismentioning

confidence: 99%

In situ investigation of NOᵪ photocatalytic degradation: Case study in an open space office in Manchester, UK

Hot¹,

Bradley²,

Cooper³

et al. 2019

Health Environ

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Indoor air is contaminated by numerous pollutants, which impact human health, comfort and productivity. These pollutants have various indoor sources such as building materials, furniture, combustion appliances or tobacco smoke. However, the pollution also comes from outside. In urban area, nitrogen oxides (NO x ) emitted into the atmosphere can reach alarming levels. These traffic-related pollutants, which seriously impact the global environment and human health, can infiltrate inside buildings. Therefore, limiting the amount of breathable NO x in outdoor and indoor environments is an important priority for the modern society. The photocatalytic process has attracted particular attention in the last two decades and has proved to be efficient to reduce the concentration of NO x . However, further work has to be conducted to assess its efficiency in real indoor environments. The purpose of this paper was to report on the indoor air quality in an open space office in Manchester, UK. Focus was made on nitric oxide (NO) and nitrogen dioxide (NO 2 ). The indoor concentrations of both gases were monitored from 14 January 2019 to 7 April 2019. During this period, a photocatalytic coating was applied to a part of the indoor wall. The influence of this coating on the level of NO x was assessed by comparing the indoor concentrations before and after the application. An attention was paid to the correlation between outdoor and indoor pollution and to the effect of other parameters such as temperature, humidity, pressure and ozone (O 3 ) concentration. The results showed that the photocatalytic process led to a decrease in the NO x concentration. The likelihood to find concentrations above 35 ppb for NO and 7.5 ppb for NO 2 was clearly reduced after the coating application.

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“…. ) [34][35][36][37][38]. Regarding bacterial and fungal disinfection, research has mainly focused on the efficiency of photocatalytic TiO 2 particles used alone, powdered or immobilized in the form of thin film coatings by complex processes (usually involving calcination).…”

Section: Introductionmentioning

confidence: 99%

Bacterial Biofilm Characterization and Microscopic Evaluation of the Antibacterial Properties of a Photocatalytic Coating Protecting Building Material

et al. 2018

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Abstract:Use of photocatalytic paint-like coatings may be a way to protect building materials from microbial colonization. Numerous studies have shown the antimicrobial efficiency of TiO 2 photocatalysis on various microorganisms. However, few have focused on easy-to-apply solutions and on photocatalysis under low irradiance. This paper focuses on (a) the antibacterial properties of a semi-transparent coating formulated using TiO 2 particles and (b) the microscopic investigations of bacterial biofilm development on TiO 2 -coated building materials under accelerated growth conditions. Results showed significant antibacterial activity after few hours of testing. The efficiency seemed limited by the confinement of the TiO 2 particles inside the coating binder. However, a pre-irradiation with UV light can improve efficiency. In addition, a significant effect against the formation of a bacterial biofilm was also observed. The epifluorescence approach, in which fluorescence is produced by reflect rather than transmitted light, could be applied in further studies of microbial growth on coatings and building materials.

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Photocatalytic degradation of NO/NO2 gas injected into a 10-m3 experimental chamber

Cited by 15 publications

References 21 publications

In situ NO abatement by photocatalysis—study under continuous NO injection in a 10-m3 experimental chamber

In situ NO abatement by photocatalysis—study under continuous NO injection in a 10-m3 experimental chamber

In situ investigation of NOᵪ photocatalytic degradation: Case study in an open space office in Manchester, UK

Bacterial Biofilm Characterization and Microscopic Evaluation of the Antibacterial Properties of a Photocatalytic Coating Protecting Building Material

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