Combination of ethanol and Fe3O4@C‐SO3H pretreatment of Eucalyptus for glucose release via enzymatic saccharification

BACKGROUND Enzymatic hydrolysis of lignocellulose is regarded as the most efficient route to producing fermentable sugars, one kind of promising future biofuel, while physiochemical pretreatment is the initial but most critical step for the efficient utilization of lignocellulose. RESULTS In this st...

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Published in:Journal of chemical technology and biotechnology (1986) 2021-03, Vol.96 (3), p.583-591
Main Authors: Luo, Jia, Qian, Le, Zhu, Yu‐Qin, Zhang, Fan, Jiang, Li‐Qun
Format: Article
Language:English
Subjects:
Biodegradation
Biofuels
Biomass
carbonaceous solid acid
ethanol pretreatment
Eucalyptus
enzymatic hydrolysis
Catalysts
Cellulose
Ethanol
Eucalyptus
Glucose
Hemicellulose
Hydrolysis
Iron oxides
Lignin
Lignocellulose
Physiochemistry
Pretreatment
Saccharification
Sugar
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Summary:BACKGROUND Enzymatic hydrolysis of lignocellulose is regarded as the most efficient route to producing fermentable sugars, one kind of promising future biofuel, while physiochemical pretreatment is the initial but most critical step for the efficient utilization of lignocellulose. RESULTS In this study, a recoverable carbonaceous solid acid catalyst Fe3O4@C‐SO3H was used in combined organosolv pretreatment of Eucalyptus biomass at 140–180 °C with 50 vol% ethanol. The introduction of solid acid in ethanol pretreatment remarkably alleviated the requirement of smaller biomass size, but provided less influence on cellulosic degradation, which benefited the subsequent enzymatic hydrolysis to glucose. After the pretreatment using 50 vol% ethanol and 20% catalyst at 160 °C, 60.3% hemicellulose and 52.6% lignin were removed from Eucalyptus (75–250 μm) within 60 min, which resulted in a cellulose retention ratio of >90% and improved hydrolysis efficiency by nearly 20 and 2 folds, respectively, compared to untreated and ethanol pretreated materials. CONCLUSION This study explored a novel pretreatment technique to improve the efficiency of enzymatic saccharification. It also demonstrated that the hydrolysis yield of cellulose had significantly positive correlation with the removal of lignin and hemicellulose in Eucalyptus, but was less affected by cellulose crystallinity. © 2020 Society of Chemical Industry
ISSN:0268-2575
1097-4660
DOI:10.1002/jctb.6571