| Title: | Antibacterial performance of a novel photocatalytic-coated cordierite foam for use in air cleaners |
| Author(s): | Yao Y; Ochiai T; Ishiguro H; Nakano R; Kubota Y; |
| Address: | "Kanagawa Academy of Science and Technology, KSP Bldg. West 6F, 3-2-1 Sakado, Takatsu-ku, Kawasaki, Kanagawa 213-0012, Japan. Department of Urology, Graduate School of Medicine, Yokohama City University, 3-9 Fukuura, Kanazawa-ku, Yokohama, Kanagawa 236-0004, Japan. Division of Photocatalyst for Energy and Environment, Research Institute for Science and Technology, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan. Kitasato Research Center for Environment Science, 1-15-1, Kitasato, Minami-ku, Sagamihara, Kanagawa 252-0329, Japan" |
| DOI: | 10.1016/j.apcatb.2011.06.020 |
| ISSN/ISBN: | 0926-3373 (Print) 0926-3373 (Electronic) 0926-3373 (Linking) |
| Abstract: | "A novel titanium dioxide-coated cordierite foam (TiO(2)/cordierite foam) was developed for use in air cleaners. By a simple impregnation procedure, TiO(2) nanoparticles were immobilized firmly onto the surface of a cordierite foam substrate through high-temperature (500 degrees 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 TiO(2)/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 TiO(2)/cordierite foam possesses a long-term bactericidal action. The TiO(2)/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 CO(2) and H(2)O. The results demonstrated that TiO(2)-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" |
| Keywords: | Air-cleaning filters Airborne pathogens Photocatalytic degradation TiO2-coated cordierite foam; |
| Notes: | "PubMed-not-MEDLINEYao, Yanyan Ochiai, Tsuyoshi Ishiguro, Hitoshi Nakano, Ryuichi Kubota, Yoshinobu eng Netherlands 2011/08/11 Appl Catal B. 2011 Aug 11; 106(3):592-599. doi: 10.1016/j.apcatb.2011.06.020. Epub 2011 Jun 23" |
