利用SEM,XRD和FTIR研究四种化学预处理对楸木木屑酶解的影响（英文）

发布时间：2019-01-11 12:24

【摘要】：利用NaOH,Ca(OH)_2,H_2SO_4和HCl四种溶液对楸木木屑进行化学预处理,发现两种碱预处理均能显著提高楸木木屑的酶解效率。采用扫描电镜(SEM),X射线衍射(XRD)和傅里叶红外光谱(FTIR)对四种化学预处理后的楸木木屑进行观察和分析。SEM观察发现,四种化学预处理对楸木木屑的纤维表面均有不同程度的破坏与侵蚀,其中Ca(OH)_2的破坏效果最为明显。XRD谱图表明,碱预处理对楸木木屑纤维素的非晶体结构产生破坏,导致其结晶度升高,而经过酸预处理后楸木木屑纤维素的结晶度没有明显变化。FTIR谱图显示,酸碱预处理对楸木木屑中半纤维素和木质素的分子结构均有不同程度的破坏,碱预处理过程中木质素的高效溶出可能是楸木木屑酶解效率显著提高的主要原因。
[Abstract]:Chemical pretreatment of sawdust with NaOH,Ca (OH) _ 2H _ 2SO _ 4 and HCl was carried out. It was found that the enzymatic hydrolysis efficiency of the wood sawdust could be significantly improved by two kinds of alkali pretreatment. (SEM), X ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) were used to observe and analyze the wood sawdust of four kinds of chemical pretreatment. Four kinds of chemical pretreatment had different degrees of destruction and erosion on the fiber surface of wood chips of Liriodendron mandshurica, among which Ca (OH) _ 2 was the most effective. XRD spectra showed that alkali pretreatment could destroy the amorphous structure of cellulose in wood chips of Liriodendron mandshurica. The crystallinity increased, but the crystallinity of lignin and hemicellulose were not changed after acid pretreatment. FTIR spectra showed that the molecular structure of hemicellulose and lignin were destroyed by acid-base pretreatment. The efficient digestion of lignin during alkali pretreatment may be the main reason for the significant improvement of enzymatic hydrolysis efficiency of wood chips of Liriodendron mandshurica.
【作者单位】：北京林业大学水体污染源控制技术北京市重点实验室;中国人民大学环境学院;北京林业大学公共分析测试中心;
【基金】：National Nature Science Foundation Issues(51178047,51578068)
【分类号】：O657

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