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Title: Robust lignin-based aerogel filters : high-efficiency capture of ultrafine airborne particulates and the mechanism
Authors: Zeng, Zhihui
Ma, Daphne Xiu Yun
Zhang, Youfang
Wang, Zhe
Ng, Bing Feng
Wan, Man Pun
Lu, Xuehong
Keywords: DRNTU::Engineering::Materials
Issue Date: 2019
Source: Zeng, Z., Ma, D. X. Y., Zhang, Y., Wang, Z., Ng, B. F., Wan, M. P., & Lu, X. (2019). Robust lignin-based aerogel filters : high-efficiency capture of ultrafine airborne particulates and the mechanism. ACS Sustainable Chemistry & Engineering, 7(7), 6959-6968. doi:10.1021/acssuschemeng.8b06567
Series/Report no.: ACS Sustainable Chemistry & Engineering
Abstract: In this article, we report a new type of ligninbased wood-like aerogel filters composed of aligned micrometer-sized pores and cross-linked lignin-based cell walls, as well as their air filtration-related properties. The aerogel filters were prepared via facile unidirectional ice-crystal-induced selfassembly from an aqueous solution, followed by annealing at 300 °C. The cross-linking of lignin and reinforcement with a very small amount of graphene significantly enhance the mechanical stiffness, thermal stability, and humidity/water resistance of the aerogels. Simultaneously, abundant functional groups retained from lignin and the aligned pore channels lead to high filtration efficiency for ultrafine particles accompanied by fairly low pressure drop. Moreover, these low-cost and renewable biomass-based filters also exhibit outstanding long-term filtration efficiency. Through filtration tests with particles of various sizes, it is revealed that the air filtration by this type of aerogel filters is dominated by diffusion, rather than impaction or interception mechanism, which offers a new avenue for design of novel high-performance air filters.
DOI: 10.1021/acssuschemeng.8b06567
Schools: School of Materials Science and Engineering 
School of Mechanical and Aerospace Engineering 
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Sustainable Chemistry & Engineering, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MAE Journal Articles
MSE Journal Articles

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