Filtration of viral aerosols via a hybrid carbon nanotube active filter

Fabrication of air filters with advanced filtration performance for removal of viral aerosols and control the spread of COVID-19

“… Particulate matter 2.5 Polyacrylonitrile and graphene oxide [ 54 ] The prepared air filter membrane exposed brilliant mechanical strength, significant thermal stability (300 °C), high (99.5%) filtration efficacy, and low (92 Pa) pressure drop. Particulate matter 2.5 Polyacrylonitrile/graphene oxide/polyimide [ 55 ] Great self-sterilization performance Bacteria, microorganisms, and aerosols Laser-induced graphene [ 56 ] Resultant filter disclosed improved antimicrobial performance and protection Airborne pathogens Ultra-thin graphene oxide /polydopamine hybrid on polypropylene surface [ 57 ] 98.2% filtration efficiency SARS-CoV-2 Functionalized graphene [ 58 ] Improved filtration effectiveness and antimicrobial performance S. epidermidis and E. coli Ag-coated CNT nano-hybrid [ 59 ] Enhanced specific surface area, improved filtration efficiency by 0.64% and high air permeability Virus Multi-walled CNTs and phenol-formaldehyde in cellulose fibers [ 60 ] The prepared air filter showed 99.999% filtration efficiency, while low-pressure drop was maintained Virus CNT on porous polyester …”

“…The prepared air filter showed 99.999% filtration efficiency (in 10 min at 26 air changes per hour), while a low-pressure drop was maintained. This air filter with electrically conductive feature could be flash heated to 130 °C in many seconds for complete inactivation of viral on filter surfaces such as betacoronavirus [ 60 ].

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“…(ii) The lower layer is made from a porous polyester backing. (iii) The fine structure of the hybrid as revealed by a backlight (Reprinted with permission from [ 60 ], Copyright 2021 Elsevier). …”

Recent breakthroughs in nanostructured antiviral coating and filtration materials: a brief review

“…This active CNT hybrid membrane reveals superior filtration efficiency (HEPA H13 level) following a Darcy's law-related trend in air permeability. 50 …”

“…This active CNT hybrid membrane reveals superior ltration efficiency (HEPA H13 level) following a Darcy's law-related trend in air permeability. 50 Carbon (C)-dot embedded nanoporous poly(vinylidene uoride) (PVDF) membranes, developed by Singh and the team, exhibited signicant features such as hydrophobicity, air permeability, breathability, excellent nano-ltration, and, most importantly, solar-induced self-sterilization via sunlight absorption and concomitant heat dissipation. 51 C-dot-PVDF membranes are an inexpensive, reusable, biodegradable, and self-sterilizing platform that can be applied in viral-blocking respirators and other PPE.…”