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Abstract：
Hemicellulose can be selectively removed by acid pretreatment. In this study, selective removal of hemicellulose was achieved using dilute sulfuric acid assisted by aluminum sulfate pretreatment. The optimal pretreatment conditions were 160 °C, 1.5 wt% aluminum sulfate, 0.7 wt% dilute sulfuric acid, and 40 min. A component analysis showed that the removal rate of hemicellulose and lignin reached 98.05% and 9.01%, respectively, which indicated that hemicellulose was removed with high selectivity by dilute sulfuric acid assisted by aluminum sulfate pretreatment. Structural characterizations (SEM, FTIR, BET, TGA, and XRD) showed that pretreatment changed the roughness, crystallinity, pore size, and functional groups of corn straw, which was beneficial to improve the efficiency of enzymatic hydrolysis. This study provides a new approach for the high-selectivity separation of hemicellulose, thereby offering novel insights for its subsequent high-value utilization.
摘要：
半纤维素可以通过酸预处理选择性地去除。在这项研究中,采用硫酸铝预处理辅助的稀硫酸实现了半纤维素的选择性去除。最佳预处理条件为160°C，1.5wt%硫酸铝,0.7wt%稀硫酸,和40分钟。组分分析结果表明,半纤维素和木质素的去除率分别达到98.05%和9.01%,分别,这表明硫酸铝预处理辅助稀硫酸可以高选择性地去除半纤维素。结构特征(SEM，FTIR,BET,TGA,和XRD)表明预处理改变了粗糙度，结晶度孔径,和玉米秸秆的官能团，有利于提高酶解效率。本研究为半纤维素的高选择性分离提供了一种新的途径,从而为其随后的高价值利用提供了新的见解。
