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Efficacy of photocatalytic HEPA filter on microorganism removal.
Indoor Air. 2010 Jun; 20(3):246-54.IA

Abstract

This study assessed the application of photocatalytic oxidation (PCO) to the high efficiency particulate air (HEPA) filter for disinfection of airborne microorganisms. Experiments were conducted at two TiO2 loadings (1870 +/- 169 and 3140 +/- 67 mg/m(2)) on the HEPA filter irradiated with UV-A at the intensity of 0.85 +/- 0.18 or 4.85 +/- 0.09 mW/cm(2) under two relative humidity conditions (45 +/- 5% and 75 +/- 5%). Inactivation and penetration of four microorganisms were tested, including Aspergillus niger, Penicillium citrinum, Staphylococcus epidermidis, and Bacillus subtilis. It was found that microorganisms retained on a photocatalytic filter were inactivated around 60-80% and even 100% for S. epidermidis when the PCO reactions occurred. Lower penetration was also found from the photocatalytic filter for all airborne microorganisms. High humidity decreased photocatalysis efficacy. Increasing TiO2 loading or irradiance intensity did not substantially affect its disinfection capability.

PRACTICAL IMPLICATIONS

The high efficiency particulate air filter is used widely to remove particulates and microorganisms from the air stream. However, the filter may become a source of microbes if those retained microorganisms proliferate and re-entrain back into the filtered air. This study demonstrates that such a problem can be handled effectively by using photocatalytic reactions to inactivate those confined microorganisms. A 60-100% microbe reduction can be achieved for a wide variety of microorganisms to provide better indoor air quality for hospitals, offices, and domestic applications.

Authors+Show Affiliations

Department of Environmental Science, Faculty of Science and Technology, Thammasat University, Thailand. paradee@tu.ac.thNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

20573124

Citation

Chuaybamroong, P, et al. "Efficacy of Photocatalytic HEPA Filter On Microorganism Removal." Indoor Air, vol. 20, no. 3, 2010, pp. 246-54.
Chuaybamroong P, Chotigawin R, Supothina S, et al. Efficacy of photocatalytic HEPA filter on microorganism removal. Indoor Air. 2010;20(3):246-54.
Chuaybamroong, P., Chotigawin, R., Supothina, S., Sribenjalux, P., Larpkiattaworn, S., & Wu, C. Y. (2010). Efficacy of photocatalytic HEPA filter on microorganism removal. Indoor Air, 20(3), 246-54. https://doi.org/10.1111/j.1600-0668.2010.00651.x
Chuaybamroong P, et al. Efficacy of Photocatalytic HEPA Filter On Microorganism Removal. Indoor Air. 2010;20(3):246-54. PubMed PMID: 20573124.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Efficacy of photocatalytic HEPA filter on microorganism removal. AU - Chuaybamroong,P, AU - Chotigawin,R, AU - Supothina,S, AU - Sribenjalux,P, AU - Larpkiattaworn,S, AU - Wu,C-Y, PY - 2010/6/25/entrez PY - 2010/6/25/pubmed PY - 2011/6/17/medline SP - 246 EP - 54 JF - Indoor air JO - Indoor Air VL - 20 IS - 3 N2 - UNLABELLED: This study assessed the application of photocatalytic oxidation (PCO) to the high efficiency particulate air (HEPA) filter for disinfection of airborne microorganisms. Experiments were conducted at two TiO2 loadings (1870 +/- 169 and 3140 +/- 67 mg/m(2)) on the HEPA filter irradiated with UV-A at the intensity of 0.85 +/- 0.18 or 4.85 +/- 0.09 mW/cm(2) under two relative humidity conditions (45 +/- 5% and 75 +/- 5%). Inactivation and penetration of four microorganisms were tested, including Aspergillus niger, Penicillium citrinum, Staphylococcus epidermidis, and Bacillus subtilis. It was found that microorganisms retained on a photocatalytic filter were inactivated around 60-80% and even 100% for S. epidermidis when the PCO reactions occurred. Lower penetration was also found from the photocatalytic filter for all airborne microorganisms. High humidity decreased photocatalysis efficacy. Increasing TiO2 loading or irradiance intensity did not substantially affect its disinfection capability. PRACTICAL IMPLICATIONS: The high efficiency particulate air filter is used widely to remove particulates and microorganisms from the air stream. However, the filter may become a source of microbes if those retained microorganisms proliferate and re-entrain back into the filtered air. This study demonstrates that such a problem can be handled effectively by using photocatalytic reactions to inactivate those confined microorganisms. A 60-100% microbe reduction can be achieved for a wide variety of microorganisms to provide better indoor air quality for hospitals, offices, and domestic applications. SN - 1600-0668 UR - https://www.unboundmedicine.com/medline/citation/20573124/Efficacy_of_photocatalytic_HEPA_filter_on_microorganism_removal_ L2 - https://doi.org/10.1111/j.1600-0668.2010.00651.x DB - PRIME DP - Unbound Medicine ER -