竹材预水解过程木质素迁移行为研究  

Migration Behavior of Lignin during Bamboo Pre-hydrolysis

作　　者：林玲 曹石林[1] 马晓娟[1] 黄六莲[1] 罗小林[1] 陈礼辉[1] 

机构地区：[1]福建农林大学材料工程学院,福建福州350002

出　　处：《林产化学与工业》2014年第5期79-83,共5页Chemistry and Industry of Forest Products

基　　金：国家自然科学基金面上项目(31270638);福建省自然科学基金项目(2012J01065)

摘　　要：通过分析竹片在预水解过程中的表面形貌及化学组成变化,研究木质素在竹材水解过程中的迁移行为。结果表明,在竹片预水解过程中,竹片内部的木质素类物质会逐渐迁移至竹片的表层和表面。竹片表层物质的FT-IR图显示,木质素特征峰随着水解程度的提高不断增强,而半纤维素特征峰则逐渐消失;竹片表层物质的XPS图显示,水解至120 min时表层物质的C1(C—C/C—H)含量较竹原料显著增加,从24.0%上升至45.5%,C2(C—O)含量明显减小,从35.5%下降至24.3%,O/C从0.43降低至0.34;水解20 min时表层木质素含量略低于竹片平均木质素含量,超过20 min后表层木质素含量均高于竹片平均木质素含量,而且其差值逐渐上升,水解120 min时,表层木质素为43.3%,竹片平均木质素为26.5%。Understanding of the lignin migration behavior during bamboo pre-hydrolysis is essential for optimization of prehydrolysis technology and following cooking process. In this paper,the lignin migration behavior was investigated by Environment Scanning Electron Microscope（ ESEM） and chemical composition analysis. The results showed that the interior lignin would gradually migrate to the bamboo surface. The infrared absorption characteristic peaks of lignin were enhanced while the peaks of hemicellulose were gradually disappeared during the pre-hydrolysis. The XPS analysis indicated that the C1（ C—C/C—H）content increased from 24. 0% to 45. 5%,while C2（ C—O） content decreased from 35. 5% to 24. 3% and the O/C ratio decreased from 0. 43 to 0. 34 as the bamboo was pre-hydrolyzed for 120 minutes. The higher lignin concentration was observed in the pretreated bamboo surface as compared to other raw material. The disparity between the lignin concentration of the whole bamboo and the lignin concentration of the bamboo surface increased with the pre-hydrolysis time,and lignin cocentration increased from 26. 5 % to 43. 3 % at the time of 120 min.

关 键 词：竹子 预水解 木质素 迁移 

分 类 号：TQ35[化学工程]