NaOH固态预处理对稻草中纤维素结构特性的影响

Studies on NaOH solid-state pretreatment on the cellulosic structural changes of rice straw

通过NaOH固态预处理,提高稻草厌氧消化产气量,从而实现稻草的高效能源转化。采用傅立叶变换红外光谱(FTIR)、X射线衍射光谱(XRD)研究了未处理与经过6%NaOH固态处理后稻草中纤维素结构的变化情况。结果表明:NaOH固态预处理使稻草中纤维素的形态结构发生了变化,纤维素中的部分β-(1→4)-糖苷键与氢键发生断裂;纤维素的晶体类型与002面微晶位置虽然没有改变,但是纤维素的结晶度与002面微晶尺寸增大。这些变化是导致稻草厌氧消化产气量提高的原因之一。

A new NaOH solid-state pretreatment was used for chemical pretreatment of rice straw. The celluloses extracted from untreated and 6% NaOH-pretreated rice straws were characterized by FTIR-spectra and X-ray diffraction. The results showed that significant changes such as a partial disruption of the hydrogen bonds and β-（1→4）-glycosidic linkages has occurred in the morphology of the NaOH-pretreated cellulose fibers. The crystalline type of cellulose and the microcrystalline place at 002 lattice plane didn＇t change a lot during the alkali treatment, but the crystallinity and the microcrystalline size at 002 lattice plane increased. Such changes led to an increase of anaerobic digestion efficiency and biogas yield from rice straw.