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Title: Decontamination Assessment of Nanofiber-based N95 Masks
Journal: Environmental Science and Pollution
Author: Raheleh Faridi-Majidi, Faezeh Norouz, Safieh Boroumand, Seyed Nasrollah Tabatabaei & Reza Faridi-Majidi
Year: 2022
Address: 1. Fanavaran Nano-Meghyas (Fnm Co. Ltd.), Tehran, Iran 2. Department of Medical Nanotechnology, School of Advanced Technologies in Medicine, Tehran University of Medical Sciences, Tehran, Iran
Abstract: As the world battles with the outbreak of the novel coronavirus, it also prepares for future global pandemics that threaten our health, economy, and survivor. During the outbreak, it became evident that use of personal protective equipment (PPE), specially face masks, can signifcantly slow the otherwise uncontrolled spread of the virus. Nevertheless, the outbreak and its new variants have caused shortage of PPE in many regions of the world. In addition, waste management of the enormous economical and environmental footprint of single use PPE has proven to be a challenge. Therefore, this study advances the theme of decontaminating used masks. More specifcally, the efect of various decontamination techniques on the integrity and functionality of nanofber-based N95 masks (i.e. capable of at least fltering 95% of 0.3 μm aerosols) were examined. These techniques include 70% ethanol, bleaching, boiling, steaming, ironing as well as placement in autoclave, oven, and exposure to microwave (MW) and ultraviolet (UV) light. Herein, fltration efciency (by Particle Filtration Efciency equipment), general morphology, and microstructure of nanofbers (by Field Emission Scanning Electron microscopy) prior and after every decontamination technique were observed. The results suggest that decontamination of masks with 70% ethanol can lead to signifcant unfavorable changes in the microstructure and fltration efciency (down to 57.33%) of the masks. In other techniques such as bleaching, boiling, steaming, ironing and placement in the oven, fltration efciency dropped to only about 80% and in addition, some morphological changes in the nanofber microstructure were seen. Expectedly, there was no signifcant reduction in fltration efciency nor microstructural changes in the case of placement in autoclave and exposure to the UV light. It was concluded that, the latter methods are preferable to decontaminate nanofber-based N95 masks
Keywords: Face masks, Nanofbers ,Filtration efciency , Pressure drop ,Microstructure
Application: Respiratory Face Mask
Product Model 1: Filter Tester(FT150EA)
Product Model 2:
URL: #https://link.springer.com/content/pdf/10.1007/s11356-022-20903-w.pdf?pdf=button#