Carbon dot-polymer nanoporous membrane for recyclable sunlight-sterilized facemasks

Facemasks are considered the most effective means for preventing infection and spread of viral particles. In particular, the coronavirus (COVID-19) pandemic underscores the urgent need for developing recyclable facemasks due to the considerable environmental damage and health risks imposed by disposable masks and respirators. We demonstrate synthesis of nanoporous membranes comprising carbon dots (Cdots) and poly(vinylidene fluoride) (PVDF), and demonstrate their potential use for recyclable, selfsterilized facemasks. Notably, the composite C-dot-PVDF films exhibit hydrophobic surface which prevents moisture accumulation and a compact nanopore network which allows both breathability as well as effective filtration of particles above 100 nm in diameter. Particularly important, self-sterilization occurs upon short solar irradiation of the membrane, as the embedded C-dots efficiently absorb visible light, concurrently giving rise to elevated temperatures through heat dissipation. (c) 2021 Elsevier Inc. All rights reserved.

Automated summary

Facemasks are essential in preventing infection and viral spread, highlighting the need for recyclable masks to reduce environmental damage and health risks from disposable masks. A study showed nanoporous membranes made of carbon dots and PVDF could potentially be used for recyclable, self-sterilized facemasks. The composite films have a hydrophobic surface, a compact nanopore network, and can self-sterilize upon short solar irradiation.