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Lightweight, flexible, and multifunctional anisotropic nanocellulose-based aerogels for CO2 adsorption
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0002-1484-7224
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0003-1776-2725
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering.ORCID iD: 0000-0003-1053-4623
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0003-4762-2854
2020 (English)In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882XArticle in journal (Refereed) Epub ahead of print
Abstract [en]

CO2 adsorption is a promising strategy to reduce costs and energy use for CO2 separation. In this study, we developed CO2 adsorbents based on lightweight and flexible cellulose nanofiber aerogels with monolithic structures prepared via freeze-casting, and cellulose acetate or acetylated cellulose nanocrystals (a-CNCs) were introduced into the aerogels as functional materials using an impregnation method to provide CO2 affinity. The microstructure of the adsorbent was examined using scanning electron microscopy, and compression tests were performed to analyze the mechanical properties of the adsorbents. The CO2 adsorption behavior was studied by recording the adsorption isotherms and performing column breakthrough experiments. The samples showed excellent mechanical performance and had a CO2 adsorption capacity of up to 1.14 mmol/g at 101 kPa and 273 K. Compared to the adsorbent which contains cellulose acetate, the one impregnated with a-CNCs had better CO2 adsorption capacity and axial mechanical properties owing to the building of a nanoscale scaffold on the surface of the adsorbent. Although the CO2 adsorption capacity could be improved further, this paper reports a potential CO2 adsorbent that uses all cellulose-based materials, which is beneficial for the environment from both resource and function perspectives. Moreover, the interesting impregnation process provides a new method to attach functional materials to aerogels, which have potential for use in many other applications.

Place, publisher, year, edition, pages
Springer, 2020.
Keywords [en]
Cellulose aerogel, CO2 adsorption, Freeze-casting, Cellulose nanocrystals, Acetylation
National Category
Materials Engineering Chemical Process Engineering Bio Materials
Research subject
Chemical Technology; Wood and Bionanocomposites
Identifiers
URN: urn:nbn:se:ltu:diva-77515DOI: 10.1007/s10570-019-02935-7OAI: oai:DiVA.org:ltu-77515DiVA, id: diva2:1388469
Funder
Bio4EnergyAvailable from: 2020-01-24 Created: 2020-01-24 Last updated: 2020-01-27

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Wei, JiayuanGeng, ShiyuHedlund, JonasOksman, Kristiina

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