定量和定性表征氢氧化钠处理小麦秸秆的双重尺度机械增强对其纤维素和结晶结构变化的影响。

Quantitative and qualitative characterization of dual scale mechanical enhancement on cellulosic and crystalline-structural variation of NaOH treated wheat straw.

机构信息

College of Engineering, China Agricultural University, Box 191, Beijing 100083, China.

出版信息

Bioresour Technol. 2020 Sep;312:123535. doi: 10.1016/j.biortech.2020.123535. Epub 2020 May 18.

DOI:10.1016/j.biortech.2020.123535

Abstract

In order to explore the effects of different mechanical fragmentation on cellulose separation and cellulose polymorphic transformation of wheat straw during alkali treatment, one coarse milled (CM) and two ball milled wheat straw samples (BM30 and BM120) were treated with different NaOH concentrations (1%-10%), and the lignocellulosic compositions and crystalline-structural various were quantitative and qualitative characterized. The quantitative equations between cellulose content and NaOH concentration of different mechanical treated samples were Y = 69.8-35.1exp(-0.64X)), Y = 71.3-35.1exp(-0.86X)) and Y = 73.5-35.1exp(-1.82X)). The enhancement effect of cellulose separation with the increasing mechanical fragmentation intensity is mainly due to the increasing hemicellulose solubilization. X-ray diffraction results reveals that the NaOH concentration required for cellulose crystalline transformation of CM, BM30 and BM120 is 10%, 8% and 2%, respectively. In conclusion, mechanical fragmentation contributes to cellulose separation and cellulose crystalline transformation under lower NaOH concentration.

摘要

为了探索不同机械破碎方式对麦草碱处理过程中纤维素分离和纤维素多晶型转变的影响，将 1 种粗磨（CM）和 2 种球磨麦草样品（BM30 和 BM120）分别用不同浓度的 NaOH（1%-10%）处理，并对木质纤维素成分和结晶结构进行了定量和定性分析。不同机械处理样品的纤维素含量与 NaOH 浓度之间的定量方程分别为 Y = 69.8-35.1exp(-0.64X))、Y = 71.3-35.1exp(-0.86X)) 和 Y = 73.5-35.1exp(-1.82X))。随着机械破碎强度的增加，纤维素分离的增强效果主要归因于半纤维素的溶解增加。X 射线衍射结果表明，CM、BM30 和 BM120 纤维素结晶转变所需的 NaOH 浓度分别为 10%、8%和 2%。总之，机械破碎有助于在较低的 NaOH 浓度下实现纤维素的分离和结晶转变。