期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 4, 期 3, 页码 1255-1261出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.5b01298
关键词
Lignocellulosic biomass; Pretreatment; Formic acid delignification; Alkaline deformylation; Structural feature; Enzymatic digestibility
资金
- National Natural Science Foundation of China [21306028]
- National Basic Research Program of China (973 Program) [2011CB707406]
- National Energy Administration Project of China [NY20130402]
Enzymatic digestibility of sugar cane bagasse could be greatly enhanced by Formiline pretreatment, which comprises a formic acid (FA) delignification followed by an alkaline deformylation. The FA can be easily recovered and recycled for delignification, indicating that this pretreatment is a green process for biomass fractionation. It was found that removing hemicelluloses and lignin during pretreatment contributed to the increase of cellulose accessibility; however, delignification seemed to be more important for exposing cellulose fibers. The compact cell wall structure of raw bagasse was destroyed by removing considerable parts of lignin and hemicelluloses with liberation of cellulose fibers, and the specific surface area of the pretreated substrates increased by more than 2 fold. However, formylation of cellulose took place during FA delignification, which showed significant negative impact on the initial enzymatic hydrolysis rate and enzymatic polysaccharide conversion at 120 h. Removing formyl groups by alkaline post-treatment could well recover the cellulose digestibility but without significant alteration of the substrate structure.
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