The Experts below are selected from a list of 216 Experts worldwide ranked by ideXlab platform
Erick Ringot - One of the best experts on this subject based on the ideXlab platform.
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In situ NO abatement by photocatalysis—study under continuous NO injection in a 10-m^3 experimental chamber
Air Quality Atmosphere & Health, 2019Co-Authors: Jivko Topalov, Erick Ringot, Julie Hot, Alexandra BertronAbstract: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 oxidised 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/m^2 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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In situ investigation of NOᵪ Photocatalytic degradation: Case study in an open space office in Manchester, UK
Health and Environment, 2019Co-Authors: Paul Bradley, Jayson Cooper, Barnabé Wayser, Erick RingotAbstract: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 (NOx) 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 NOx 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 NOx. 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 (NO2). 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 NOx 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 O3 concentration. The results showed that the Photocatalytic process led to a decrease in the NOx concentration. The likelihood to find concentrations above 35 ppb for NO and 7.5 ppb for NO2 was clearly reduced after the Coating application.
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In situ NO abatement by photocatalysis – study under continuous NO injection in a 10-m3 experimental chamber
Air Quality Atmosphere & Health, 2018Co-Authors: Jivko Topalov, Erick Ringot, Julie Hot, Alexandra BertronAbstract:Air pollution is a serious public health concern in France and many other countries. Nitrogen oxides (NOx) include nitrogen monoxide (NO) and nitrogen dioxide (NO2). 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 NO2 are 200 µg/m3 (short-term exposure) and 40 µg/m3 (long-term exposure). Although no guideline values exist for NO, this gas can be oxidized by atmospheric ozone and thus produce NO2. This paper studies the depollution efficiency of photocatalysis towards indoor NO. Experiments were conducted at real scale, in a 10-m3 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 TiO2). 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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Algal growth inhibition on cement mortar: Efficiency of water repellent and Photocatalytic treatments under UV/VIS illumination
International Biodeterioration & Biodegradation, 2014Co-Authors: Thomas Martinez, Alexandra Bertron, Gilles Escadeillas, Erick RingotAbstract:Abstract Building materials are regularly affected by the growth of microalgae. The consequences are mainly aesthetic but the colonization can cause biodeterioration of the material in the most extreme cases. This study investigates two building material treatments that can potentially inhibit or slow down such growth: Photocatalytic Coatings and water repellent treatments. The efficiency of these treatments in terms of biological growth inhibition was tested on the algae species Graesiella emersonii. Algal growth on building materials was investigated using two accelerated tests simulating different types of humidification (water capillary ascent and water run-off) under different lighting conditions. Mortars treated with Photocatalytic Coating or with water repellent were studied. The algal growth on the mortar surface was evaluated using image analysis (area covered and intensity of fouling). No slow down of the biological growth kinetics could be attributed to Photocatalytic substrates. However, for mortars impregnated with a water-repellent preparation, algal growth slowed significantly under water run-off and even stopped under water capillary ascent.
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Algal growth inhibition on cement mortar: Efficiency of water repellent and Photocatalytic treatments under UV/VIS illumination
International Biodeterioration and Biodegradation, 2014Co-Authors: Thomas Martinez, Alexandra Bertron, Gilles Escadeillas, Erick RingotAbstract:Building materials are regularly affected by the growth of microalgae. The consequences are mainly aesthetic but the colonization can cause biodeterioration of the material in the most extreme cases. This study investigates two building material treatments that can potentially inhibit or slow down such growth: Photocatalytic Coatings and water repellent treatments. The efficiency of these treatments in terms of biological growth inhibition was tested on the algae species Graesiella emersonii. Algal growth on building materials was investigated using two accelerated tests simulating different types of humidification (water capillary ascent and water run-off) under different lighting conditions. Mortars treated with Photocatalytic Coating or with water repellent were studied. The algal growth on the mortar surface was evaluated using image analysis (area covered and intensity of fouling). No slow down of the biological growth kinetics could be attributed to Photocatalytic substrates. However, for mortars impregnated with a water-repellent preparation, algal growth slowed significantly under water run-off and even stopped under water capillary ascent. (C) 2014 Elsevier Ltd. All rights reserved.
Thomas Martinez - One of the best experts on this subject based on the ideXlab platform.
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Algal growth inhibition on cement mortar: Efficiency of water repellent and Photocatalytic treatments under UV/VIS illumination
International Biodeterioration & Biodegradation, 2014Co-Authors: Thomas Martinez, Alexandra Bertron, Gilles Escadeillas, Erick RingotAbstract:Abstract Building materials are regularly affected by the growth of microalgae. The consequences are mainly aesthetic but the colonization can cause biodeterioration of the material in the most extreme cases. This study investigates two building material treatments that can potentially inhibit or slow down such growth: Photocatalytic Coatings and water repellent treatments. The efficiency of these treatments in terms of biological growth inhibition was tested on the algae species Graesiella emersonii. Algal growth on building materials was investigated using two accelerated tests simulating different types of humidification (water capillary ascent and water run-off) under different lighting conditions. Mortars treated with Photocatalytic Coating or with water repellent were studied. The algal growth on the mortar surface was evaluated using image analysis (area covered and intensity of fouling). No slow down of the biological growth kinetics could be attributed to Photocatalytic substrates. However, for mortars impregnated with a water-repellent preparation, algal growth slowed significantly under water run-off and even stopped under water capillary ascent.
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Algal growth inhibition on cement mortar: Efficiency of water repellent and Photocatalytic treatments under UV/VIS illumination
International Biodeterioration and Biodegradation, 2014Co-Authors: Thomas Martinez, Alexandra Bertron, Gilles Escadeillas, Erick RingotAbstract:Building materials are regularly affected by the growth of microalgae. The consequences are mainly aesthetic but the colonization can cause biodeterioration of the material in the most extreme cases. This study investigates two building material treatments that can potentially inhibit or slow down such growth: Photocatalytic Coatings and water repellent treatments. The efficiency of these treatments in terms of biological growth inhibition was tested on the algae species Graesiella emersonii. Algal growth on building materials was investigated using two accelerated tests simulating different types of humidification (water capillary ascent and water run-off) under different lighting conditions. Mortars treated with Photocatalytic Coating or with water repellent were studied. The algal growth on the mortar surface was evaluated using image analysis (area covered and intensity of fouling). No slow down of the biological growth kinetics could be attributed to Photocatalytic substrates. However, for mortars impregnated with a water-repellent preparation, algal growth slowed significantly under water run-off and even stopped under water capillary ascent. (C) 2014 Elsevier Ltd. All rights reserved.
Yanyan Wang - One of the best experts on this subject based on the ideXlab platform.
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Convenient and Recyclable TiO2/g-C3N4 Photocatalytic Coating: Layer-by-Layer Self-assembly Construction on Cotton Fabrics Leading to Improved Catalytic Activity under Visible Light
Industrial & Engineering Chemistry Research, 2019Co-Authors: Yanyan Wang, Xin Ding, Ping Zhang, Qi Wang, Kang Zheng, Lin Chen, Jianjun Ding, Xingyou Tian, Xian ZhangAbstract:In this work, a TiO2/g-C3N4 Photocatalytic Coating is built on cotton fabrics with a simple layer-by-layer (LBL) self-assembly strategy in which TiO2 and g-C3N4 are alternately assembled on cotton fabrics via electrostatic attraction. The fabrics, as support, disperse TiO2/g-C3N4 powder photocatalyst to expose more active sites. The fabrics also act as an adsorbent to boost the pollutants capture. Consequently, the coated fabrics exhibit an outstanding Photocatalytic property applicable for degradation of both liquid rhodamine (RhB) and gaseous toluene pollutants. The fabric with seven bilayer Coatings shows the best for RhB decomposition with degradation rate of 92.5%. Over 90% toluene could be eliminated by the Photocatalytic Coating under simulated sunlight irradiation. Besides, the Coating fabrics show excellent stability and reusability.
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convenient and recyclable tio2 g c3n4 Photocatalytic Coating layer by layer self assembly construction on cotton fabrics leading to improved catalytic activity under visible light
Industrial & Engineering Chemistry Research, 2019Co-Authors: Yanyan Wang, Xin Ding, Ping Zhang, Qi Wang, Kang ZhengAbstract:In this work, a TiO2/g-C3N4 Photocatalytic Coating is built on cotton fabrics with a simple layer-by-layer (LBL) self-assembly strategy in which TiO2 and g-C3N4 are alternately assembled on cotton fabrics via electrostatic attraction. The fabrics, as support, disperse TiO2/g-C3N4 powder photocatalyst to expose more active sites. The fabrics also act as an adsorbent to boost the pollutants capture. Consequently, the coated fabrics exhibit an outstanding Photocatalytic property applicable for degradation of both liquid rhodamine (RhB) and gaseous toluene pollutants. The fabric with seven bilayer Coatings shows the best for RhB decomposition with degradation rate of 92.5%. Over 90% toluene could be eliminated by the Photocatalytic Coating under simulated sunlight irradiation. Besides, the Coating fabrics show excellent stability and reusability.
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Convenient and Recyclable TiO2/g‑C3N4 Photocatalytic Coating: Layer-by-Layer Self-assembly Construction on Cotton Fabrics Leading to Improved Catalytic Activity under Visible Light
2019Co-Authors: Yanyan Wang, Xin Ding, Ping Zhang, Qi Wang, Kang Zheng, Lin Chen, Jianjun Ding, Xingyou Tian, Xian ZhangAbstract:In this work, a TiO2/g-C3N4 Photocatalytic Coating is built on cotton fabrics with a simple layer-by-layer (LBL) self-assembly strategy in which TiO2 and g-C3N4 are alternately assembled on cotton fabrics via electrostatic attraction. The fabrics, as support, disperse TiO2/g-C3N4 powder photocatalyst to expose more active sites. The fabrics also act as an adsorbent to boost the pollutants capture. Consequently, the coated fabrics exhibit an outstanding Photocatalytic property applicable for degradation of both liquid rhodamine (RhB) and gaseous toluene pollutants. The fabric with seven bilayer Coatings shows the best for RhB decomposition with degradation rate of 92.5%. Over 90% toluene could be eliminated by the Photocatalytic Coating under simulated sunlight irradiation. Besides, the Coating fabrics show excellent stability and reusability
Shuxue Zhou - One of the best experts on this subject based on the ideXlab platform.
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Preparation of Photocatalytic TiO 2 -based self-cleaning Coatings for painted surface without interlayer
Progress in Organic Coatings, 2017Co-Authors: Fei Xu, Alvin M. Maurice, James Bohling, Limin Wu, Hong Yu Chen, Tao Wang, Shuxue ZhouAbstract:Photocatalytic TiO 2 provides a promising route to produce self-cleaning Coating surfaces, but it often causes decomposition of organic substrates and other Coating components. An interlayer is often employed to insulate Photocatalytic activity from sensitive substrate layers, complicating the application of these self-cleaning Coatings. Herein, Photocatalytic TiO 2 -based Coatings were prepared based on an aqueous TiO 2 dispersion in a hybrid binder synthesized from tetraethyl orthosilicate and methyl trimethoxy silane via a sol-gel process. Coatings with various levels of nano TiO 2 were prepared and found to be transparent to visible light; i.e., the clear Coating could be directly cast on architectural latex Coatings without changing its original appearance. The Photocatalytic Coating system was composed of a TiO 2 -based clear top coat and an opaque latex film underneath. The Coatings were evaluated through outdoor exposure studies and accelerated weathering tests. Results of these tests showed that the Photocatalytic Coatings with a TiO 2 content range of 33–45% exhibited excellent self-cleaning performance, while displaying none of the expected degradation. In fact, this nano TiO 2 -based clear Coating actually protected the latex film from UV-induced damage. The increased stability of the organic film may have resulted from reduced UV transmission through the photo-catalyst containing clear coat as well as reduced water permeability. It was demonstrated that the combination of appropriate TiO 2 content and a suitable binder are crucial for the fabrication of robust Photocatalytic self-cleaning Coatings for painted surfaces without the need for an interlayer.
Alexandra Bertron - One of the best experts on this subject based on the ideXlab platform.
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In situ NO abatement by photocatalysis—study under continuous NO injection in a 10-m^3 experimental chamber
Air Quality Atmosphere & Health, 2019Co-Authors: Jivko Topalov, Erick Ringot, Julie Hot, Alexandra BertronAbstract: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 oxidised 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/m^2 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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In situ NO abatement by photocatalysis – study under continuous NO injection in a 10-m3 experimental chamber
Air Quality Atmosphere & Health, 2018Co-Authors: Jivko Topalov, Erick Ringot, Julie Hot, Alexandra BertronAbstract:Air pollution is a serious public health concern in France and many other countries. Nitrogen oxides (NOx) include nitrogen monoxide (NO) and nitrogen dioxide (NO2). 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 NO2 are 200 µg/m3 (short-term exposure) and 40 µg/m3 (long-term exposure). Although no guideline values exist for NO, this gas can be oxidized by atmospheric ozone and thus produce NO2. This paper studies the depollution efficiency of photocatalysis towards indoor NO. Experiments were conducted at real scale, in a 10-m3 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 TiO2). 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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Algal growth inhibition on cement mortar: Efficiency of water repellent and Photocatalytic treatments under UV/VIS illumination
International Biodeterioration & Biodegradation, 2014Co-Authors: Thomas Martinez, Alexandra Bertron, Gilles Escadeillas, Erick RingotAbstract:Abstract Building materials are regularly affected by the growth of microalgae. The consequences are mainly aesthetic but the colonization can cause biodeterioration of the material in the most extreme cases. This study investigates two building material treatments that can potentially inhibit or slow down such growth: Photocatalytic Coatings and water repellent treatments. The efficiency of these treatments in terms of biological growth inhibition was tested on the algae species Graesiella emersonii. Algal growth on building materials was investigated using two accelerated tests simulating different types of humidification (water capillary ascent and water run-off) under different lighting conditions. Mortars treated with Photocatalytic Coating or with water repellent were studied. The algal growth on the mortar surface was evaluated using image analysis (area covered and intensity of fouling). No slow down of the biological growth kinetics could be attributed to Photocatalytic substrates. However, for mortars impregnated with a water-repellent preparation, algal growth slowed significantly under water run-off and even stopped under water capillary ascent.
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Algal growth inhibition on cement mortar: Efficiency of water repellent and Photocatalytic treatments under UV/VIS illumination
International Biodeterioration and Biodegradation, 2014Co-Authors: Thomas Martinez, Alexandra Bertron, Gilles Escadeillas, Erick RingotAbstract:Building materials are regularly affected by the growth of microalgae. The consequences are mainly aesthetic but the colonization can cause biodeterioration of the material in the most extreme cases. This study investigates two building material treatments that can potentially inhibit or slow down such growth: Photocatalytic Coatings and water repellent treatments. The efficiency of these treatments in terms of biological growth inhibition was tested on the algae species Graesiella emersonii. Algal growth on building materials was investigated using two accelerated tests simulating different types of humidification (water capillary ascent and water run-off) under different lighting conditions. Mortars treated with Photocatalytic Coating or with water repellent were studied. The algal growth on the mortar surface was evaluated using image analysis (area covered and intensity of fouling). No slow down of the biological growth kinetics could be attributed to Photocatalytic substrates. However, for mortars impregnated with a water-repellent preparation, algal growth slowed significantly under water run-off and even stopped under water capillary ascent. (C) 2014 Elsevier Ltd. All rights reserved.