秸秆制备再生木质纤维素多孔球:原料溶液浓度的影响

摘要

The utilization of lignocellulose such as straw has spurred wide interests.In this study,wheat straw was employed to prepare porous regenerated lignocellulose-beads (LBs) by an emulsification-solidification-freeze drying process using [Bmim] C1 as a solvent.The lignocellulosebeads fabricated at four different concentrations of wheat straw-solution were compared.The beads derived from 5％ wheat straw-solution was found to have regular morphology,uniform microstructure,the biggest specific surface area,and the maximum ability of nitrogen adsorption rate.The thinner the wheat straw-solution was,the narrower the particle size distribution was.There existed a positive correlation between the degree of crystallinity of cellulose in LBs and the concentration of wheat straw-solution.These results suggest that the concentration of wheat strawsolution was the predominant factor for the preparation of porous regenerated lignocellulose-beads.This work contributes significantly to the understanding of physical and chemical properties of LBs and to the optimization of process parameters.%秸秆的高值转化一直备受研究人员的关注.以[Bmim] C1(1-丁基-3-甲基咪唑氯盐)溶解小麦秸秆,经乳化-固化-冻干过程制备再生秸秆木质纤维素多孔球.比较不同浓度秸秆溶液制备的木质纤维素球.结果如下:秸秆溶液浓度为5％时球形态和微观结构最好,具有最大的比表面积和氮吸附能力;较低浓度秸秆溶液制备的球粒径分布更窄;球中纤维素结晶度与秸秆溶液浓度呈正相关.研究表明,秸秆溶液浓度是制备秸秆木质纤维素多孔球的重要影响因素.本工作对研究再生秸秆木质纤维素多孔球的理化性质和优化制球工艺有指导意义.