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Photocatalytic inactivation of airborne bacteria in a continuous-flow reactor / Amrita Pal in Industrial & engineering chemistry research, Vol. 47 N°20 (Octobre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N°20 (Octobre 2008) . - P. 7580-7585 Titre : Photocatalytic inactivation of airborne bacteria in a continuous-flow reactor Type de document : texte imprimé Auteurs : Amrita Pal, Editeur scientifique ; Simo O. Pehkonen, Editeur scientifique ; Liya E. Yu, Editeur scientifique Année de publication : 2008 Article en page(s) : P. 7580-7585 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Photocatalytic  inactivation  Airborne  bacteria  TiO2  kinetic  data Résumé : In this study, a continuous annular reactor was used to characterize the TiO2-mediated inactivation of an aerosolized Gram-negative bacterium, Escherichia coli K-12 (ATCC 10798), by varying UV-A intensity (0.5−3.4 mW/cm2), relative humidity (RH) (from 51 ± 0.61 to 85 ± 4.7%), and photocatalyst loading (960 and 1516 mg/m2) at an air flow rate of 1 L/min. Inactivation rate of E. coli K-12 increased with an increase in TiO2 loading, UV-intensity, and RH. A UV-A dose of 0.03−0.204 J/cm2 at an average UV-A intensity of 0.5−3.4 mW/cm2, at a residence time of 1.1 min, is sufficient to fully and continuously inactivate E. coli K-12 passing through the reactor. The photocatalytic inactivation rates obtained in the continuous flow reactor compared well with our earlier batch inactivation rates conducted at a UV-A intensity of 0.015 mW/cm2 and a TiO2 loading of 1516 mg/m2. This demonstrates the possibility of scaling up of the photocatalytic inactivation process for bioaerosol based on batch kinetic data. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie701739g [article] Photocatalytic inactivation of airborne bacteria in a continuous-flow reactor [texte imprimé] / Amrita Pal, Editeur scientifique ; Simo O. Pehkonen, Editeur scientifique ; Liya E. Yu, Editeur scientifique . - 2008 . - P. 7580-7585. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°20 (Octobre 2008) . - P. 7580-7585 Mots-clés : Photocatalytic  inactivation  Airborne  bacteria  TiO2  kinetic  data Résumé : In this study, a continuous annular reactor was used to characterize the TiO2-mediated inactivation of an aerosolized Gram-negative bacterium, Escherichia coli K-12 (ATCC 10798), by varying UV-A intensity (0.5−3.4 mW/cm2), relative humidity (RH) (from 51 ± 0.61 to 85 ± 4.7%), and photocatalyst loading (960 and 1516 mg/m2) at an air flow rate of 1 L/min. Inactivation rate of E. coli K-12 increased with an increase in TiO2 loading, UV-intensity, and RH. A UV-A dose of 0.03−0.204 J/cm2 at an average UV-A intensity of 0.5−3.4 mW/cm2, at a residence time of 1.1 min, is sufficient to fully and continuously inactivate E. coli K-12 passing through the reactor. The photocatalytic inactivation rates obtained in the continuous flow reactor compared well with our earlier batch inactivation rates conducted at a UV-A intensity of 0.015 mW/cm2 and a TiO2 loading of 1516 mg/m2. This demonstrates the possibility of scaling up of the photocatalytic inactivation process for bioaerosol based on batch kinetic data. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie701739g