High-performance and sustainable aerosol filters based on hierarchical and crosslinked nanofoams of cellulose nanofibers
| Autor: | Juha Kangasluoma, Ossi Laitinen, Erkki Siivola, Tomi Vainio, Markus Lampimäki, Tuukka Petäjä, Henrikki Liimatainen, Jonne Ukkola |
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| Přispěvatelé: | Institute for Atmospheric and Earth System Research (INAR), Department of Physics, Doctoral Programme in Atmospheric Sciences |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Cellulose nanofiber
Materials science Particle number 020209 energy Strategy and Management 02 engineering and technology 114 Physical sciences Industrial and Manufacturing Engineering law.invention law Specific surface area 0202 electrical engineering electronic engineering information engineering Nanofoam Porosity Filtration 1172 Environmental sciences 0505 law General Environmental Science Renewable Energy Sustainability and the Environment 05 social sciences Building and Construction Waste paper 6. Clean water Chemical engineering Nanofiber 050501 criminology Particle Particle size Aerosol filtration Airborne particles |
| Popis: | Nano-structured and porous foams derived from crosslinked cellulose nanofibers (CNF) were designed and tailored as highly efficient aerosol filters. The lignin-containing CNF was prepared from a recycled milk-container board using deep eutectic solvent pretreatment and mechanical grinding. The nanofoams or aerogels were formed in different densities (initial CNF concentration of 0.2–1.0 wt%) with a freeze-drying process using two silane compounds for strengthening the structure. The filtration performance of nanofoams was studied with a Differential Mobility Particle Sizer (DMPS) setup using 10–500 nm NaCl aerosol particles. DMPS determines particle number size distribution of particles passing through nanofoams which is used to calculate the filtration performance. All nanofoams, which possessed porosity from 99.1% to 99.8% and specific surface area from 5.9 m2 g−1 to 18.6 m2 g−1, achieved good filtration performance (>96%) in the measured particle size range. Very high filtration efficiency (>99.5%) was achieved with the 0.7 wt% nanofoam sample for particles smaller than 360 nm. Based on the quality factors (QF), 0.3 wt% nanofoam produced the lowest pressure drop yet with relatively high filtration efficiency and resulted in the highest QF value that met the N95 standard requirements of respirator face masks. The structure and thickness of the nanofoam filter makes possible high particle bearing without loss on its performance. |
| Databáze: | OpenAIRE |
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