Waste biomass valorisation for the development of sustainable cellulosic aerogels and their sound absorption properties

Novel and more sustainable sound absorbing materials are produced through the valorization of waste biomass sources by following circular economy principles. Cellulosic nanocrystals (CNC) were extracted from Posidonia oceanica dead leaves, spent barely grains, and kale stems (KS) using a simplified purification protocol. These nanocrystals are used to prepare cellulosic aerogels, evaluating the effect of three parameters, namely, concentration (0.5–4%), CaCl2 and poly(lactic acid) (PLA) incorporation (hybrid aerogels), on their sound absorption properties. Aerogels from 4% suspensions show the highest sound absorption, outperforming benchmark rockwool and polyester—two modern commonly-used sound absorbers. Moreover, PLA coating also improves the sound absorption performance of the most aerogels. CNC from KS aerogels are selected as the optimum at both high (500–6000 Hz) and low (100–1500 Hz) frequency ranges. Overall, these results represent a new proof-of-concept of waste biomass conversion to high-performance cellulosic aerogels that have excellent sound absorbing properties.

Bibliographic Details

Main Authors:	Benito González, Isaac, Cucharero, Jose, Al Haj, Yazan, Hänninen, Tuomas, Lokki, Tapio, Martínez Sanz, Marta, López-Rubio, Amparo, Martínez-Abad, Antonio, Vapaavuori, Jaana
Other Authors:	European Commission
Format:	artículo biblioteca
Language:	English
Published:	John Wiley & Sons 2022-08-30
Subjects:	Aerogels, Biomass valorisation, Cellulosic nanocrystals, Poly(lactic acid), Sound absorption,
Online Access:	http://hdl.handle.net/10261/281944 http://dx.doi.org/10.13039/501100002341 http://dx.doi.org/10.13039/501100000780 http://dx.doi.org/10.13039/501100004837 http://dx.doi.org/10.13039/501100003339 http://dx.doi.org/10.13039/501100011033 https://api.elsevier.com/content/abstract/scopus_id/85137024532
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