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J Hazard Mater. 2018 Jun 5;351:29-37. doi: 10.1016/j.jhazmat.2018.02.043. Epub 2018 Feb 24.

Washable antimicrobial polyester/aluminum air filter with a high capture efficiency and low pressure drop.

Author information

1
Powder and Ceramics Division, Korea Institute of Materials and Science, Changwondaero 797, Seongsan-gu, Changwon, 51508, Republic of Korea.
2
Center for Environment, Health, and Welfare Research, Korea Institute of Science and Technology (KIST), Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul, 02792, Republic of Korea; Aerosol and Bioengineering Laboratory, Department of Engineering, Konkuk University, Neungdong-ro 120, Gwangjin-gu, Seoul, 05029, Republic of Korea.
3
Center for Environment, Health, and Welfare Research, Korea Institute of Science and Technology (KIST), Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul, 02792, Republic of Korea.
4
Aerosol and Bioengineering Laboratory, Department of Engineering, Konkuk University, Neungdong-ro 120, Gwangjin-gu, Seoul, 05029, Republic of Korea.
5
Powder and Ceramics Division, Korea Institute of Materials and Science, Changwondaero 797, Seongsan-gu, Changwon, 51508, Republic of Korea; Alink Co. Ltd., Chanwondaero 797, Seongsan-gu, Changwon, 51508, Republic of Korea. Electronic address: hyelee@kims.re.kr.
6
Center for Environment, Health, and Welfare Research, Korea Institute of Science and Technology (KIST), Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul, 02792, Republic of Korea; Green School, Korea University, Anam-ro 145, Seongbuk-gu, Seoul, 02841, Republic of Korea; Division of Energy & Environment Technology, KIST School, Korea University of Science and Technology, Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul, 02792, Republic of Korea. Electronic address: jaehee@kist.re.kr.

Abstract

Here, we introduce a reusable bifunctional polyester/aluminum (PET/Al) air filter for the high efficiency simultaneous capture and inactivation of airborne microorganisms. Both bacteria of Escherichia coli and Staphylococcus epidermidis were collected on the PET/Al filter with a high efficiency rate (∼99.99%) via the electrostatic interactions between the charged bacteria and fibers without sacrificing pressure drop. The PET/Al filter experienced a pressure drop approximately 10 times lower per thickness compared with a commercial high-efficiency particulate air filter. As the Al nanograins grew on the fibers, the antimicrobial activity against airborne E. coli and S. epidermidis improved to ∼94.8% and ∼96.9%, respectively, due to the reinforced hydrophobicity and surface roughness of the filter. Moreover, the capture and antimicrobial performances were stably maintained during a cyclic washing test of the PET/Al filter, indicative of its reusability. The PET/Al filter shows great potential for use in energy-efficient bioaerosol control systems suitable for indoor environments.

KEYWORDS:

Air filter; Antimicrobial filter; Bioaerosol; Conductive fiber; Particulate matter

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