Photocatalytic oxidation of gaseous perchloroethylene over TiO 2 based paint

Monteiro, Ricardo A.R.; Silva, Adrián M.T.; Ângelo, Joana; Silva, Gabriela V.; Mendes, Adélio; Boaventura, Rui A.R.; Vilar, Vítor J.P.

doi:10.1016/j.jphotochem.2015.06.007

Cited by 35 publications

(15 citation statements)

References 44 publications

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“…Even though acetaldehyde degradation experiments presented higher pollutant conversions, the higher PE and QE of the NO/NOx system is an indication of the good performance of TiO 2 under UV light. Although the photonic efficiencies for the experiments under visible light and the ones under UV light differ by one order of magnitude, the results obtained are in good agreement with the values found in the literature for visible light (Tryba et al, 2014) and UV light (Ângelo et al, 2014;Monteiro et al, 2014Monteiro et al, , 2015.…”

Section: Efficiencies Evaluationsupporting

confidence: 88%

“…have followed the standard ISO 1524 (2007) using a flat plate continuous photoreactor irradiated with UV light; other authors have employed reaction chambers (Maggos et al, 2007a,b;Salthammer and Fuhrmann, 2007) or other type of flow reactors (Laufs et al, 2010;Ângelo et al, 2014) and have used sunlight (Ângelo et al, 2014) or visible light (Salthammer and Fuhrmann, 2007) as the energy source for the NO x photocatalytic oxidation. Second are VOCs such as formaldehyde (Salthammer and Fuhrmann, 2007;Fu et al, 2013), acetaldehyde (Salvadores et al, 2020a,b), n-decane (Monteiro et al, 2014), perchloroethylene (Monteiro et al, 2015), and toluene (Maggos et al, 2007c) applying UV radiation in most of them. Third are other toxic or dangerous compounds like CO (Salthammer and Fuhrmann, 2007) and benzo-[a]-pyrene (Tryba et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

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Efficiencies Evaluation of Photocatalytic Paints Under Indoor and Outdoor Air Conditions

et al. 2020

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The removal of indoor and outdoor air pollutants is crucial to prevent environmental and health issues. Photocatalytic building materials are an energy-sustainable technology that can completely oxidize pollutants, improving in situ the air quality of contaminated sites. In this work, different photoactive TiO 2 catalysts (anatase or modified anatase) and amounts were used to formulate photocatalytic paints in replacement of the normally used TiO 2 (rutile) pigment. These paints were tested in two different experimental systems simulating indoor and outdoor environments. In one, indoor illumination conditions were used in the photoreactor for the oxidation of acetaldehyde achieving conversions between 37 and 55%. The other sets of experiments were performed under simulated outdoor radiation for the degradation of nitric oxide, resulting in conversions between 13 and 35%. This wide range of conversions made it difficult to directly compare the paints. Thus, absorption, photonic, and quantum efficiencies were calculated to account for the paints photocatalytic performance. It was found that the formulations containing carbon-doped TiO 2 presented the best efficiencies. The paint with the maximum amount of this photocatalyst showed the highest absorption and photonic efficiencies. On the other hand, the paint with the lowest amount of carbon-doped TiO 2 presented the highest value of quantum efficiency, thus becoming the optimal formulation in terms of energy use.

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Section: Efficiencies Evaluationsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Efficiencies Evaluation of Photocatalytic Paints Under Indoor and Outdoor Air Conditions

et al. 2020

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“…TiO2, ZnO, ZrO2, WO3, etc) [2,3]. Photocatalytic oxidation is a viable environmental remediation technology which has been widely investigated in recent years for indoor air purification purposes [4]. Excitation of electrons from the valence band to the conduction band by light having energy greater than semiconductor's band gap is the fundamental process in PCO.…”

Section: Introductionmentioning

confidence: 99%

Systematic variation of preparation time, temperature, and pressure in hydrothermal synthesis of macro-/mesoporous TiO2 for photocatalytic air treatment

Mamaghani

Haghighat

Lee

2019

Journal of Photochemistry and Photobiology A: Chemistry

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Highlights Macro-/mesoporous TiO2 photocatalysts were synthesized via a hydrothermal route. Impacts of hydrothermal time, temperature, and pressure on titania was examined.  • OH generation on illuminated titania was measured by photoluminescence method. Correlation between crystalinity and surface area and • OH generation was found. Toluene/MEK photocatalytic oxidation was conducted to evaluate activity of catalysts.

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“…The main drawback of this process is that the oxidation reactions may be incomplete and reaction intermediates can be emitted even in the presence of typical indoor low concentration of VOCs as clearly evidenced by Debono et al [5,6]. In the field of VOC photocatalytic oxidation, most of the investigations are based on single VOC treatment and carried out with ppm levels of pollutants [7,8], whereas indoor air contains several tens of VOCs characterized by ppb level concentrations, i.e. from 0.1 to 100 g m −3 [9].…”

Section: Introductionmentioning

confidence: 99%

VOC ternary mixture effect on ppb level photocatalytic oxidation: Removal kinetic, reaction intermediates and mineralization

Debono

Hequet

Coq

et al. 2017

Applied Catalysis B: Environmental

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This work addresses photocatalytic oxidation for indoor air purification and more especially the key and realistic issue of VOC mixture treatment. The VOC mixture effect needs to be investigated since indoor air contains several tens of VOCs which may impact photocatalytic oxidation performances. In order to be closer to realistic conditions, concentrations in the ppb range were used and toluene, decane and trichloroethylene (TCE) were treated first as single compounds, then as an equimolar ternary mixture under the same experimental conditions. In a 120 L batch reactor, VOC removal kinetics, reaction intermediates and CO 2 mineralization are addressed using dedicated analytical devices compliant with typical ppb level monitoring. Regarding removal kinetics, the mixture effect affects the three VOCs. Regarding toluene and decane removal kinetic, the mixture effect is evidenced as mostly equivalent to a concentration effect, however TCE kinetic is further impacted. From the reaction intermediate point of view, the accurate monitoring of transiently produced intermediates evidences for the first time cross-reactivity between reaction intermediates originating from different primary VOCs. This phenomenon leading to novel reaction intermediate is mostly induced by chlorinated species produced by TCE degradation but remains moderate. An increase in VOC initial concentration to upper ppb levels emphasized a sequential degradation of primary VOC which may be related to competitive adsorption even on such a low concentration range. Finally, even if the mixture effect delays the removal of the primary VOCs, mineralization is slightly modified and, unlike formerly reported experiments on ppm range, final mineralization rates are equivalent under single or mixture condition at ppb levels. This work highlights the fact that photocatalytic treatment of VOC mixtures cannot be directly extrapolated from single VOC behaviour even at ppb level.

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Photocatalytic oxidation of gaseous perchloroethylene over TiO 2 based paint

Cited by 35 publications

References 44 publications

Efficiencies Evaluation of Photocatalytic Paints Under Indoor and Outdoor Air Conditions

Efficiencies Evaluation of Photocatalytic Paints Under Indoor and Outdoor Air Conditions

Systematic variation of preparation time, temperature, and pressure in hydrothermal synthesis of macro-/mesoporous TiO2 for photocatalytic air treatment

VOC ternary mixture effect on ppb level photocatalytic oxidation: Removal kinetic, reaction intermediates and mineralization

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