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Antibacterial performance of a novel photocatalytic-coated cordierite foam for use in air cleaners

Paper ID Volume ID Publish Year Pages File Format Full-Text
46938 46453 2011 8 PDF Available
Title
Antibacterial performance of a novel photocatalytic-coated cordierite foam for use in air cleaners
Abstract

A novel titanium dioxide-coated cordierite foam (TiO2/cordierite foam) was developed for use in air cleaners. By a simple impregnation procedure, TiO2 nanoparticles were immobilized firmly onto the surface of a cordierite foam substrate through high-temperature (500 °C) calcination. The strong bactericidal performance of the fabricated foam was evaluated by a newly developed test method for complex three-dimensional through-pore structures. This method could trace 5–6 log units of decrease in bacterial cell numbers in an air environment, thus meeting the criteria of both the JIS and ISO standard test methods. With 0.25 mW cm−2 of UV-A irradiation for 24 h, the bactericidal rate of the TiO2/cordierite foam exceeded 99.9% for five types of airborne or droplet-based infectious pathogens: Escherichia coli (E. coli), Pseudomonas aeruginosa (P. aeruginosa), Legionella pneumophila (L. pneumophila), Klebsiella pneumoniae (K. pneumoniae), and methicillin-resistant Staphylococcus aureus (MRSA). The results of repeat testing, where the same sample was used three times, revealed that the bactericidal rate for E. coli was maintained at 99.9% in the second and third use, indicating that the TiO2/cordierite foam possesses a long-term bactericidal action. The TiO2/cordierite foam also exhibited a high photocatalytic degradation capability on gaseous acetaldehyde, which is associated with sick building syndrome, and volatile organic compounds to generate CO2 and H2O. The results demonstrated that TiO2-coated cordierite foam has great potential for use in air-cleaning filters with not only high bactericidal performance to remove pathogens in the air and in droplets, but also strong decontaminating and deodorizing functionality.

Graphical abstractA TiO2 film with highly crystalline mesoparticles was synthesized on the rough surface of a ceramic (cordierite) by a simple impregnation and calcination procedure. When treated by relatively low-intensity UV-A irradiation (0.25 mW cm−2) for 24 h, the TiO2-coated cordierite foam reduced by over 99.9% the number of viable cells of three gram-negative strains of bacteria (Escherichia coli, Legionella pneumophila, and Klebsiella pneumoniae), and also the gram-positive methicillin-resistant Staphylococcus aureus, all of which are extremely important airborne infectious bacteria. The bactericidal activity assessment was carried out by an original test method developed for the three-dimensional porous structures seen in various ceramic and metal foams.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights• TiO2-coated cordierite foam with highly crystalline meso-particles. • Strong photocatalytic antimicrobial against four strains of airborne pathogens. • An original bactericidal test method for porous structures was applied. • High photocatalytic degradation on gaseous acetaldehyde to generate CO2 and H2O. • TiO2/cordierite foam is a promising material for air disinfection and purification.

Keywords
TiO2-coated cordierite foam; Photocatalytic degradation; Airborne pathogens; Air-cleaning filters
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Antibacterial performance of a novel photocatalytic-coated cordierite foam for use in air cleaners
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 106, Issues 3–4, 11 August 2011, Pages 592–599
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us