バイオ廃棄物をサステナブルな吸音材に転換(Biowastes converted into a sustainable material for sound absorption)


2022-10-27 フィンランド・アールト大学




廃棄物系バイオマスの有効利用による持続可能なセルロース系エアロゲルの開発とその吸音特性に関する研究 Waste Biomass Valorisation for the Development of Sustainable Cellulosic Aerogels and their Sound Absorption Properties

Isaac Benito-González,Jose Cucharero,Yazan Al Haj,Tuomas Hänninen,Tapio Lokki,Marta Martínez-Sanz,Amparo López-Rubio,Antonio Martínez-Abad,Jaana Vapaavuori

Advanced Sustainable Systems  Published: 30 August 2022



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.