Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 5, Issue 9, Pages 7623-7631Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.7b00954
Keywords
Cellulose nanocrystals; Deep eutectic solvent; Cotton; Strong hydrogen bond; High yield
Categories
Funding
- National Natural Science Foundation of China [31670583, 31622016]
- Natural Science Foundation of Heilongjiang Province of China [JC2016002]
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The content of cellulose in biomass is important for producing nanocellulose in high yields. Cotton fibers containing ultrahigh purity (similar to 95%) cellulose are ideal feedstock for nanocellulose production. However, the presence of strong hydrogen bonding between the cellulose chains limits the use of cotton fibers for the production of nanocellulose in a facile and mild process. Here, efficient cleavage of the strong hydrogen bonds in cotton and ultrafast fabrication of cellulose nanocrystals (CNCs) with a high yield of 74.2% were first realized through a 3 min microwave-assisted deep eutectic solvent pretreatment and a subsequent high-intensity ultrasonication process. The obtained CNCs had diameters of 3-25 nm, and lengths ranged between 100 and 350 nm. The CNCs also displayed a relative crystallinity of 82%, and the thermal degradation temperature started from 320 degrees C. The study provides a green and efficient method for the mass production of cotton CNCs, and is expected to contribute to improving the refinery utilization of cotton feedstock.
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