Recent advances and future perspectives in engineering biodegradable face masks

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Abstract

Development of biodegradable and functionalised face mask nonwovens to address the plastic pollution issue generated by disposable face masks.

Abstract

The emergence of the COVID-19 pandemic and airborne particulate matter pollution have caused a surge in the consumption of face masks in recent years. Typically, face masks are made from nondegradable petroleum-derived nonwoven materials adding to global plastic pollution and aggravating environmental concerns. Therefore, it is important to fabricate sustainable biodegradable replacements. This review intends to highlight and discuss state-of-the-art research activities that centre on the development of biodegradable nonwoven materials for face mask applications. We also identify potential candidates and strategies for future research and product development efforts. Finally, we present our perspectives on a wide avenue in need of further exploration concerning materials, methods, advanced functionalities, cost, scalability, and shelf life of sustainable advanced face masks.

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Degradation Rates of Plastics in the Environment

Ali Chamas, Hyunjin Moon, Jiajia Zheng … (2020)

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Discovery and quantification of plastic particle pollution in human blood

Heather Leslie, Martin J. M. van Velzen, Sicco H Brandsma … (2022)

Plastic particles are ubiquitous pollutants in the living environment and food chain but no study to date has reported on the internal exposure of plastic particles in human blood. This study's goal was to develop a robust and sensitive sampling and analytical method with double shot pyrolysis - gas chromatography/mass spectrometry and apply it to measure plastic particles ≥700 nm in human whole blood from 22 healthy volunteers. Four high production volume polymers applied in plastic were identified and quantified for the first time in blood. Polyethylene terephthalate, polyethylene and polymers of styrene (a sum parameter of polystyrene, expanded polystyrene, acetonitrile butadiene styrene etc.) were the most widely encountered, followed by poly(methyl methacrylate). Polypropylene was analysed but values were under the limits of quantification. In this study of a small set of donors, the mean of the sum quantifiable concentration of plastic particles in blood was 1.6 µg/ml, showing a first measurement of the mass concentration of the polymeric component of plastic in human blood. This pioneering human biomonitoring study demonstrated that plastic particles are bioavailable for uptake into the human bloodstream. An understanding of the exposure of these substances in humans and the associated hazard of such exposure is needed to determine whether or not plastic particle exposure is a public health risk.

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Aerosol Filtration Efficiency of Common Fabrics Used in Respiratory Cloth Masks

Abhiteja Konda, Abhinav Prakash, Gregory A. Moss … (2020)

The emergence of a pandemic affecting the respiratory system can result in a significant demand for face masks. This includes the use of cloth masks by large sections of the public, as can be seen during the current global spread of COVID-19. However, there is limited knowledge available on the performance of various commonly available fabrics used in cloth masks. Importantly, there is a need to evaluate filtration efficiencies as a function of aerosol particulate sizes in the 10 nm to 10 μm range, which is particularly relevant for respiratory virus transmission. We have carried out these studies for several common fabrics including cotton, silk, chiffon, flannel, various synthetics, and their combinations. Although the filtration efficiencies for various fabrics when a single layer was used ranged from 5 to 80% and 5 to 95% for particle sizes of 300 nm, respectively, the efficiencies improved when multiple layers were used and when using a specific combination of different fabrics. Filtration efficiencies of the hybrids (such as cotton–silk, cotton–chiffon, cotton–flannel) was >80% (for particles 90% (for particles >300 nm). We speculate that the enhanced performance of the hybrids is likely due to the combined effect of mechanical and electrostatic-based filtration. Cotton, the most widely used material for cloth masks performs better at higher weave densities (i.e., thread count) and can make a significant difference in filtration efficiencies. Our studies also imply that gaps (as caused by an improper fit of the mask) can result in over a 60% decrease in the filtration efficiency, implying the need for future cloth mask design studies to take into account issues of “fit” and leakage, while allowing the exhaled air to vent efficiently. Overall, we find that combinations of various commonly available fabrics used in cloth masks can potentially provide significant protection against the transmission of aerosol particles.