Kimiyasu Shiraki 1, Hiroshi Yamada1, Yoshihiro Yoshida1, Ayumu Ohno1, Teruo Watanabe2, Takafumi Watanabe2, Hiroyuki Watanabe2, Hidemitsu Watanabe2, Masao Yamaguchi2, Fumio Tokuoka3, Shigeatsu Hashimoto4, Masakazu Kawamura5, Norihisa Adachi5

  • 1 Department of Virology, University of Toyama, Toyama 930-0194, Japan
  • 2 APS Japan Co., Ltd., Osaka City, Osaka 541-0059, Japan
  • 3 Shonan Ceramics Corporation, Hadano, Kanagawa 259-1305, Japan
  • 4 Department of Metabolism, Diabetes and Nephrology, Fukushima Medical University Aizu Medical Center, Aizuwakamatsu City, Fukushima 969-3492, Japan
  • 5 TechnoPLAS Japan Co., Ltd., Chuo-ku, Tokyo 103-0024, Japan

Received: June 27, 2017
Revised: October 3, 2017
Accepted: October 4, 2017
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Cite this article:
Shiraki, K., Yamada, H., Yoshida, Y., Ohno, A., Watanabe, T., Watanabe, T., Watanabe, H., Watanabe, H., Yamaguchi, M., Tokuoka, F., Hashimoto, S., Kawamura, M. and Adachi, N. (2017). Improved Photocatalytic Air Cleaner with Decomposition of Aldehyde and Aerosol-Associated Influenza Virus Infectivity in Indoor Air. Aerosol Air Qual. Res. 17: 2901-2912.


  • A photocatalytic air cleaner eliminates PM2.5, acetaldehyde and influenza virus.
  • The system decomposed 90% of 5 ppm gaseous acetaldehyde by a single pass.
  • Acetaldehyde was completely decomposed to CO2 at the ratio of one to two.
  • Acetaldehyde at 20 ppm was removed at a half-life of 8 min in a cubic meter of space.
  • Influenza virus were broken down into RNA and eliminated within 7 minutes.



Air pollution caused by fine particulate matter (PM2.5), volatile organic compounds, and bioaerosols is a major environmental risk to health. We developed a photocatalytic air cleaner for reducing the pollution levels of indoor air; we improved the photocatalytic system by using UV-LED for the removal of acetaldehyde and PM2.5 and by reducing the weight and size of the system. The efficiency of photocatalysis depends on the surface area and materials. Therefore, we prepared a nanosized titanium dioxide (TiO2)-coated aluminum plate irradiated by UV-LED lamps (wavelength: 375 nm) as a photocatalytic air cleaner. Passing air continuously through a TiO2-coated aluminum plate (5 × 10 × 1 cm) under black light for 200 min decomposed 90% of 5 ppm acetaldehyde (12.4 µmol h–1) and generated two carbon dioxide molecules (25.43 µmol h–1) at a molar ratio of 1:2, indicating complete decomposition of acetaldehyde with high efficiency. This photocatalytic air cleaner was applied to the decomposition of acetaldehyde and inactivation and removal of aerosol-associated influenza virus. Acetaldehyde (20 ppm) in a 1-m3 cubic space was eliminated in 60 min at a half-life of 8 min. The aerosol-associated infectivity and the RNA genome of influenza virus A/PR/8/1934 (H1N1) produced by a nebulizer in a 779-L cubic space were eliminated within 7 min; however, they were detectable for up to 28 minutes when the functional photocatalytic air cleaner was not used. The presence of intermediate breakdown products of influenza virus indicated that the virus was broken down by photocatalysis. Thus, the photocatalytic air cleaner efficiently decomposed and eliminated organic chemicals, acetaldehyde, and aerosol-associated influenza virus infectivity and viral RNA, indicating that it can clean and detoxify the indoor air in a closed space for maintaining a safer environment.

Keywords: Indoor air quality; PM2.5; Nanosized-TiO2; Photocatalysis; Degradation of influenza virus; Air cleaner

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