摘要
玉米秸秆中含有丰富纤维素,是天然的"纤维素库".若将其提取出来加以利用,将会极大程度地提高秸秆的附加值,为生产生活带来便利.本实验采用微波辅助法处理玉米秸秆粉末,去除其中的半纤维素和木质素,提取其中的秸秆纤维素.利用傅里叶变换红外光谱、X射线衍射以及扫描电镜的方法从形貌、结构以及性能等方面对提取产物进行表征.探究NaOH溶液的质量分数、微波加热时间、微波加热功率、亚氯酸钠浓度以及料液比对提取率的影响,得到从玉米秸秆中提取秸秆纤维素的最佳实验条件为:NaOH 溶液质量分数为 12%,微波功率为 595 W,微波加热时间为9 min,NaClO2浓度为 0.3 mol/L.
Abstract
Corn stover is rich in cellulose,which is a natural"cellulose bank".If it is extracted and utilized,it will greatly increase the added value of straw and bring convenience to production and life.In this experiment,the cellulose was extracted by microwave-assisted method of NaOH solution,with the help of the influence of microwave radiation on molecular movement,which promotes the friction be-tween molecules and leads to the rupture of cells,breaking cellulose,hemicellulose and lignin in the cell wall,and the alkaline solution has a solubilizing effect on hemicellulose,so that hemicellulose in the straw was effectively removed.The product obtained in the previ-ous step was then treated with a mixed solution of sodium chlorite and acetic acid,so as to remove the lignin therein,and finally straw cellulose was obtained.Fourier transform infrared spectroscopy,X-ray diffraction and scanning electron microscopy were used to charac-terize the extracted products in terms of morphology,structure and properties.The effects of sodium hydroxide concentration,microwave heating time,microwave heating power,sodium chlorite concentration and material-liquid ratio on the extraction rate were investigated,and the optimal experimental conditions for the extraction of stover cellulose from corn stover were 12%NaOH concentration,595 W mi-crowave power,9 min microwave heating time and 0.3 mol/L NaClO2 concentration.
基金项目
吉林省教育厅科学技术研究项目(JJKH20220239KJ)
NETL
NSTL
万方数据