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Photocatalytic degradation of air pollutants — From modeling to large scale application / M. Hunger in Cement and concrete research, Vol. 40 N° 2 (02 ex.) (Fevrier 2010) 

Public ISBD [article]  in Cement and concrete research > Vol. 40 N° 2 (02 ex.) (Fevrier 2010) . - pp. 313-320 Titre : Photocatalytic degradation of air pollutants — From modeling to large scale application Type de document : texte imprimé Auteurs : M. Hunger, Auteur ; G. Hüsken, Auteur ; H. J. H. Brouwers, Auteur Année de publication : 2010 Article en page(s) : pp. 313-320 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Photocatalysis  Reaction  Kinetics  Diffusion  Modeling Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : Indoor as well as outdoor air quality and their limiting values remain a major problem to our present-day society. This paper addresses the modeling of the decomposition process of nitrogen monoxide (NO) on reactive concrete surfaces under the controlled exposition of a UV source. Within this model the external mass transfer of the pollutant and the internal molecule diffusion-reaction were considered. A first-order kinetics equation is derived with respect to the NO concentration and a site-competitive adsorption between NO/NO2 and water molecules, resulting in a dependence of the reaction kinetics on the relative humidity. Using the proposed model, a reaction rate constant k and an adsorption equilibrium constant Kd can be derived which describe an active paving stone accurately. Experimental results from a self-developed photoreactor with continuous flow mode were used to validate the proposed kinetic expression. Furthermore, the effect of variations in process conditions such as irradiance and relative humidity on the two constants k and Kd is investigated. All modeling work provides a sound foundation for the translation of this process to real outside conditions. In this regard an upcoming project in a Dutch city is described in brief. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TWG-4XJW020-1&_user=6 [...] [article] Photocatalytic degradation of air pollutants — From modeling to large scale application [texte imprimé] / M. Hunger, Auteur ; G. Hüsken, Auteur ; H. J. H. Brouwers, Auteur . - 2010 . - pp. 313-320. Génie Civil Langues : Anglais (eng) in Cement and concrete research > Vol. 40 N° 2 (02 ex.) (Fevrier 2010) . - pp. 313-320 Mots-clés : Photocatalysis  Reaction  Kinetics  Diffusion  Modeling Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : Indoor as well as outdoor air quality and their limiting values remain a major problem to our present-day society. This paper addresses the modeling of the decomposition process of nitrogen monoxide (NO) on reactive concrete surfaces under the controlled exposition of a UV source. Within this model the external mass transfer of the pollutant and the internal molecule diffusion-reaction were considered. A first-order kinetics equation is derived with respect to the NO concentration and a site-competitive adsorption between NO/NO2 and water molecules, resulting in a dependence of the reaction kinetics on the relative humidity. Using the proposed model, a reaction rate constant k and an adsorption equilibrium constant Kd can be derived which describe an active paving stone accurately. Experimental results from a self-developed photoreactor with continuous flow mode were used to validate the proposed kinetic expression. Furthermore, the effect of variations in process conditions such as irradiance and relative humidity on the two constants k and Kd is investigated. All modeling work provides a sound foundation for the translation of this process to real outside conditions. In this regard an upcoming project in a Dutch city is described in brief. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TWG-4XJW020-1&_user=6 [...]