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dc.contributor.authorMa, Daphne Xiu Yunen_US
dc.contributor.authorZeng, Zhihuien_US
dc.contributor.authorWang, Zheen_US
dc.contributor.authorXu, Luluen_US
dc.contributor.authorZhang, Youfangen_US
dc.contributor.authorAng, Jia Mingen_US
dc.contributor.authorWan, Man Punen_US
dc.contributor.authorNg, Bing Fengen_US
dc.contributor.authorLu, Xuehongen_US
dc.identifier.citationMa, D. X. Y., Zeng, Z., Wang, Z., Xu, L., Zhang, Y., Ang, J. M., Wan, M. P., Ng, B. F. & Lu, X. (2022). Robust microhoneycomb-like nanofibrous aerogels derived from cellulose and lignin as highly efficient, low-resistant and anti-clogging air filters. Journal of Membrane Science, 642, 119977-.
dc.description.abstractIn this article, we report highly porous yet robust microhoneycomb-like nanofibrous aerogels (NFAs) with porous cell walls and hierarchical porous structures, and their potential as durable high-performance air filters. The NFAs are fabricated from cellulose nanofibers and kraft lignin via directional ice-templating and low-temperature annealing. We found that lignin could effectively boost cross-linking reactions during the annealing, greatly enhancing the mechanical robustness of the NFAs. It also effectively minimizes annealing-induced shrinkage of the NFAs, avoiding significant porosity and pore-size reduction. Our filtration test results reveal that these robust NFA filters exhibit excellent filtration performance for particles over a wide range of sizes, including 0.1 μm and most penetrating particles. In particular, a high filtration efficiency of 99.86% with a fairly low pressure drop (ΔP) of 59.5 Pa could be achieved for 0.1 μm particles at the face velocity of ∼5 cm s−1, for which the corresponding quality factor (QF) is significantly higher than that of reported aerogel air filters fabricated using predominantly natural materials. The outstanding QF achieved could be attributed to the preferably aligned pores and porous cell walls that help to ease the airflow and create longer and tortuous travelling paths for diffusive particles while within the pores the loose, tangled nanofibers with surface functional groups could facilitate particle deposition. Moreover, heavy loading filtration tests show good long-term filtration efficiency and anti-clogging features of the NFAs. Overall, this work provides a new strategy to prepare durable NFA air filters that are capable of mitigating the tradeoff between the filtration efficiency and ΔP, and alleviating the potential microplastic pollution caused by the disposal of petroleum-based plastic filters into environments.en_US
dc.description.sponsorshipAgency for Science, Technology and Research (A*STAR)en_US
dc.description.sponsorshipMinistry of Education (MOE)en_US
dc.description.sponsorshipNanyang Technological Universityen_US
dc.relationMOE2016-T2-1- 063en_US
dc.relation.ispartofJournal of Membrane Scienceen_US
dc.rights© 2021 Elsevier B.V. All rights reserved.en_US
dc.titleRobust microhoneycomb-like nanofibrous aerogels derived from cellulose and lignin as highly efficient, low-resistant and anti-clogging air filtersen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Mechanical and Aerospace Engineeringen_US
dc.contributor.schoolInterdisciplinary Graduate School (IGS)en_US
dc.contributor.schoolSchool of Materials Science and Engineeringen_US
dc.contributor.researchEnergy Research Institute @ NTU (ERI@N)en_US
dc.subject.keywordsCellulose Nanofibersen_US
dc.description.acknowledgementXiu Yun Daphne Ma thanks Energy Research Institute @ NTU, Interdisciplinary Graduate School, and Nanyang Technological University for providing PhD scholarship in the course of this work. This work was also supported by Science and Engineering Research Council of the Agency for Science, Technology and Research (A*STAR) Singapore under Public Sector Research Funding (PSF) Grant No. 1521200077 and by the Republic of Singapore’s Ministry of Education MOE2016-T2-1- 063.en_US
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