Study on Extracting Cellulose from Corn Stalk Using Microwave-assisted Method
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.
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