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2 results on '"air purifier"'

1. Evaluation of the effectiveness of various pollution removal mechanisms of indoor air purifiers in removing suspended particles

Author

Lo Yi-Cheng, Liao Ya-Si, and Tseng Chao-Heng

Subjects
particulate matter 2.5, air purifier, clean air delivery rate, Environmental sciences, GE1-350
Abstract

This study comprehensively investigated the efficacy of five distinct air purifiers in the removal of both particulate matter and gaseous pollutants. The analysis was conducted within a consistent test environment, employing a standardized benchmark to ensure accurate and comparable results. A rigorous methodology was devised to evaluate the efficiency of each air purification mechanism. The experimental setup involved placing the air purifiers inside a controlled test chamber, carefully designed to replicate typical indoor conditions. The focus of the analysis was on the removal efficiency of PM2.5, and the evaluation utilized the Clean Air Delivery Rate (CADR) values, measured in cubic feet per minute (ft³/min or CFM). Importantly, the study maintained uniform specifications, including unit filter area and unit electrostatic volume, to facilitate a fair and meaningful comparison of the removal efficiency for each purification mechanism. The CADR values served as a quantitative metric to assess the air purifiers’ effectiveness in removing PM2.5 particles. This standardized approach allowed for a direct comparison of their performance under identical conditions. By considering unit filter area and electrostatic volume, the study aimed to provide insights into the relative merits of each mechanism, enabling consumers to make informed decisions based on the specific removal capabilities of the air purifiers. In summary, the research established a robust methodology for evaluating air purifier performance, facilitating a thorough analysis of their effectiveness in removing particulate matter and gaseous pollutants within a controlled environment. The use of CADR values and standardized specifications ensures a reliable basis for comparing the efficiency of different air purification mechanisms.

Published
2024
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2. Compréhension des mécanismes lors de la photocatalyse appliquée à la dégradation des microorganismes : application au traitement de l'air et aux textiles auto-décontaminants

Author

Carre, Gaëlle, Institut de chimie et procédés pour l'énergie, l'environnement et la santé (ICPEES), Université de Strasbourg (UNISTRA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et nanosciences d'Alsace (FMNGE), Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg, Nicolas Keller, and Philippe Andre

Subjects
Purificateur d’air, [SDV.SA]Life Sciences [q-bio]/Agricultural sciences, Bacteria, Capillary cytometry, Protein, Desinfection, Lipid peroxidation, Cytométrie capillaire, Bactérie, Textile auto-désinfectant, ROS, Protéine, Peroxydation lipidique, Air purifier, Photocatalyse, TiO2, Photocatalysis, [CHIM.OTHE]Chemical Sciences/Other, Self-disinfecting textiles
Abstract

The main objective of this work is to study the oxidation mechanisms of UV-A photocatalysis on TiO2 applied to the degradation of microorganisms and their effects on cellular components. The study of the antimicrobial efficiency of TiO2 towards a panel of microorganisms (bacteria, spores, fungi) in different media (TiO2 in rich or 'dry' environment, in liquid phase) shows the influence of the evaluation methods, test and counting on the inactivation efficiency. Studies carried out in the presence of scavenger molecule of superoxide anions (O2°-) highlight the involvement of O2°- in the antibacterial effect and lipid peroxidation. Proteomics analysis leads to propose various potential targets of the TiO2 action. Finally, an application part deals with the design of photocatalytic devices based on LEDs and β-SiC alveolar foams for air disinfection, and of sunlight active self-disinfecting layer-by-layer functionalized photocatalytic textiles.; L’objectif principal de ce travail est d’étudier les mécanismes d’oxydation lors de la photocatalyse (TiO2 irradié sous UV-A) appliquée à la dégradation des microorganismes et leurs effets sur les composants cellulaires. L'étude de l'efficacité antimicrobienne de TiO2 sur un panel de microorganismes (bactéries, spores, champignons) réalisée dans différents milieux (TiO2 en milieu riche, 'sec', en phase liquide) montre l’influence des méthodes d’évaluation, de test et de comptage sur les efficacités d’inactivation. Des études menées en présence de molécules scavengers d’anions superoxydes (O2°-) mettent en évidence l’implication des O2°- dans l’effet antibactérien et dans la peroxydation lipidique. Au niveau protéomique, diverses cibles d’action potentielles du TiO2 sont aussi proposées. Enfin, une partie applicative détermine l’efficacité antimicrobienne de dispositifs photocatalytiques équipés de mousses alvéolaires de β-SiC et de diodes électroluminescentes, et met en avant les propriétés auto-désinfectantes sous lumière solaire de textiles photocatalytiques fonctionnalisés par la technique layer-by-layer.

Published
2013

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