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dc.contributor.author
He, Weidong
dc.contributor.author
Guo, Yinghe
dc.contributor.author
Gao, Hanchao
dc.contributor.author
Liu, Jingxian
dc.contributor.author
Yue, Yang
dc.contributor.author
Wang, Jing
dc.date.accessioned
2020-11-13T08:47:56Z
dc.date.available
2020-10-05T16:51:51Z
dc.date.available
2020-10-06T06:14:34Z
dc.date.available
2020-11-13T08:47:56Z
dc.date.issued
2020-10-27
dc.identifier.issn
1936-0851
dc.identifier.issn
1936-086X
dc.identifier.other
10.1021/acsnano.0c04782
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/444642
dc.identifier.doi
10.3929/ethz-b-000444642
dc.description.abstract
The regeneration of filtering facepiece respirators (FFRs) is of critical importance because of the severe shortage of FFRs during large-scale outbreaks of respiratory epidemics, such as COVID-19. Comprehensive experiments regarding FFR regeneration were performed in this study with model bacteria to illustrate the decontamination performance of the regeneration processes. The results showed that it is dangerous to use a contaminated FFR without any microbe inactivation treatment because the bacteria can live for more than 8 h. The filtration efficiency and surface electrostatic potential of 75% ethanol-treated FFRs were significantly reduced, and a most penetrating particle size of 200 nm was observed. Steam and microwave irradiation (MWI) showed promising decontamination performances, achieving 100% inactivation in 90 and 30 min, respectively. The filtration efficiencies of steam-treated FFRs for 50 and 100 nm particles decreased from 98.86% and 99.51% to 97.58% and 98.79%, respectively. Ultraviolet irradiation (UVI) effectively inactivated the surface bacteria with a short treatment of 5 min and did not affect the filtration performance. However, the UV dose reaching different layers of the FFP2 mask sample gradually decreased from the outermost layer to the innermost layer, while the model bacteria on the second and third layers could not be killed completely. UVI+MWI and steam were recommended to effectively decontaminate the used respirators and still maintain the respirators’ filtration efficiency. The present work provides a comprehensive evaluation for FFR regeneration in terms of the filtration efficiencies for 50–500 nm particles, the electrostatic properties, mechanical properties, and decontamination effects.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
American Chemical Society
en_US
dc.rights.uri
http://rightsstatements.org/page/InC-NC/1.0/
dc.subject
COVID-19
en_US
dc.subject
nanoparticles
en_US
dc.subject
mask regeneration
en_US
dc.subject
filtration performance
en_US
dc.subject
charge decay
en_US
dc.title
Evaluation of Regeneration Processes for Filtering Facepiece Respirators in Terms of the Bacteria Inactivation Efficiency and Influences on Filtration Performance
en_US
dc.type
Journal Article
dc.rights.license
In Copyright - Non-Commercial Use Permitted
dc.date.published
2020-09-25
ethz.journal.title
ACS Nano
ethz.journal.volume
14
en_US
ethz.journal.issue
10
en_US
ethz.journal.abbreviated
ACS Nano
ethz.pages.start
13161
en_US
ethz.pages.end
13171
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Columbus, OH
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02115 - Dep. Bau, Umwelt und Geomatik / Dep. of Civil, Env. and Geomatic Eng.::02608 - Institut für Umweltingenieurwiss. / Institute of Environmental Engineering::03887 - Wang, Jing / Wang, Jing
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02115 - Dep. Bau, Umwelt und Geomatik / Dep. of Civil, Env. and Geomatic Eng.::02608 - Institut für Umweltingenieurwiss. / Institute of Environmental Engineering::03887 - Wang, Jing / Wang, Jing
en_US
ethz.date.deposited
2020-10-05T16:52:07Z
ethz.source
FORM
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2020-11-13T08:48:14Z
ethz.rosetta.lastUpdated
2022-03-29T04:01:32Z
ethz.rosetta.versionExported
true
ethz.COinS
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