NaOH溶液处理甘蔗渣过程中纤维素晶体结构的变化

Changes of Cellulose Crystal Structure in the Process of Treating Bagasse with NaOH Solution

使用傅里叶红外变换光谱仪(FT-IR)、X射线衍射仪(XRD)、扫描电镜(SEM)表征了经不同浓度的NaOH溶液处理的甘蔗渣的纤维素晶体结构的变化。结果表明:甘蔗渣纤维素的结晶度指数与NaOH溶液的浓度之间的相关性不是线性的,而是呈现先上升后下降的趋势。FT-IR表征甘蔗渣纤维素的结构能进一步证明甘蔗渣纤维素的晶体结构受NaOH溶液影响的程度很大。完整的处理过程大概分为两个阶段,即在低浓度的NaOH溶液范围内,甘蔗渣的结晶度值升高,当NaOH溶液浓度再升高时,甘蔗渣纤维素的结晶度值下降。低结晶度的甘蔗渣结晶区域被破坏,有利于甘蔗渣的进一步降解及应用,对工业中使用合适浓度的碱液处理甘蔗渣具有一定的指导意义。

Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and scanning electron microscopy (SEM) are used to characterize the changes of cellulose crystal structure of bagasse treated with different concentration of NaOH solution. The results show that the correlation between the crystallization index of bagasse cellulose and the concentration of NaOH solution is not linear, but increases firstly and then decreases. FT-IR characterization of bagasse cellulose further proves that the crystal structure of bagasse cellulose is greatly affected by NaOH solution. The complete treatment process can be divided into two stages: the crystallinity value of bagasse increases in the range of low-concentration NaOH solution, and decreases when NaOH solution concentration increases again. The destruction of crystalline zone of bagasse with low crystallinity is conducive to the further degradation and application of bagasse. It has certain guiding significance for industrial use of appropriate concentration of alkali liquor to treat bagasse.