Optimization of lignin extraction from bamboo by ultrasound-assisted organosolv pretreatment.
Bioresour Technol
; 376: 128884, 2023 May.
Article
em En
| MEDLINE
| ID: mdl-36925081
ABSTRACT
For a sustainable biorefinery, reduction in the recalcitrance of lignocellulosic biomass is very crucial for the efficient utilization of each fraction. The present work investigated an integrated pretreatment method to recover high-quality lignin along with the cellulose-rich pulp. An optimization study employing response surface methodology investigated the synergistic effects of ultrasound and organosolv pretreatment from Bambusa tulda (bamboo). The optimal condition (180 °C, 55 min, and 30 min sonication) resulted in 65.81 ± 2.40% of lignin yield with 95.37 ± 1.17% purity. A reduction in 7.85% yield and 1.54% purity of lignin with organosolv pretreatment highlighted the efficacy of sonication in lignin extraction. Ultrasound resulted in homolytic cleavage of the lignin-carbohydrate bond that enhanced delignification and increase the cellulose crystallinity. NMR, FTIR, GPC, and TGA of lignin suggested the superiority of sonication in maintaining lignin quality. A significant amount of ß-O-4 linkages in extracted lignin is favorable for its subsequent valorization.
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Base de dados:
MEDLINE
Assunto principal:
Celulose
/
Lignina
Idioma:
En
Ano de publicação:
2023
Tipo de documento:
Article