Abstract
SummaryParticulate matter (PM) pollution has posed great threat to human health. This calls for versatile protection or treatment devices that are both efficient and easy to use. Herein, we have rationally designed a novel reusable bilayer fibrous filter consisting of electrospun superhydrophobic poly(methylmethacrylate)/polydimethylsiloxane fibers as the barrier for moisture ingression and superhydrophilic chitosan fibers for a PM capture efficiency of over 96% at optical transmittance of 86%. Furthermore, it could realize a high-level PM2.5 capture efficiency (>98.23%) even after 100-h test during extremely hazardous air environment (PM2.5 > 3,000 μg m−3) and retain a high PM removal efficiency (PM2.5 > 98.39%) after five washing cycles. Besides, such membranes possessed high antibacterial activity at 96.5% for E. coli and 95.2% for Staphylococcus aureus. As a proof-of-concept study, continuous particle removing has been successfully demonstrated on a window screen to prevent particle pollution.
Highlights
Air pollution by particulate matter (PM) has posed a tremendous threat to human health and living quality (Gao et al, 2017; Wu et al, 2017; Zhang et al, 2013)
Smoke from the burning incense, as an ideal model system, has been selected as the main PM source. Such incense smoke contains extensive PM particles possessing a variety of sizes, and it comprises various pollutant gases existing in the haze, including SOx, NOx, and COx; some typical volatile organic chemicals, for instance, polycyclic aromatic hydrocarbons, aldehydes, xylenes, toluene, and benzene; as well as some other contaminants (Lin et al, 2008)
The concentration distributions of the PM particles indicate that approximately 90% of them are smaller than 1.0 mm and can deposit directly into human alveoli (Zhang et al, 2018b)
Summary
Air pollution by particulate matter (PM) has posed a tremendous threat to human health and living quality (Gao et al, 2017; Wu et al, 2017; Zhang et al, 2013). To alleviate the problems related to PM pollution, capturing of PM particles is a straightforward solution, the more dangerous PM2.5 particles, which are composed of inorganic (such as SiO2, SO4, and NO3) and organic matter (organic carbon and elemental carbon). They are usually derived from various sources such as industrial emission, biomass burning, secondary aerosols, coal combustion, vehicular exhaust emission, and soil dust (Huang et al, 2014; Lelieveld et al, 2015; Mackey et al, 2013; Platt et al, 2014; Zhang et al, 2018b). The surface properties of the filtration tools are of great importance for enhancing the removal of PM particles and should be carefully designed
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