科研之友
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摘要
The application of freeze-thaw repetition as a pretreatment method in hydrothermal treatment and green upgradation of poplar biomass has been investigated. The process was carried out at different freeze-thaw repetition (1-6 times) and freezing temperatures (-4 degrees C to -70 degrees C). Poplar chips were freeze-thawed 4 times at -20 degrees C, and then hydrolyzed by hot water for 1 h at 170 degrees C, consequently a hemicellulose yield of 85.87 mg g(-1) was obtained, showing an increase of 32.25% over that of untreated poplar chips. Besides, freeze-thaw repetition pretreatment resulted in lowered molecular weight and enhanced concentration of monosaccharides. The morphology and chemical structure of all samples were also carefully addressed, indicating that freeze-thaw repetition could create irregular micro slits and pores, thus increasing fibrous cell wall debris, which significantly contributed to the dissolution rate of hemicellulose. This study demonstrates a feasible and effective strategy to predominately extract hemicellulose from raw biomass for promising biorefinery.
