College of Engineering, China Agricultural University, Box 191, Beijing 100083, China.
College of Engineering, China Agricultural University, Box 191, Beijing 100083, China.
Bioresour Technol. 2021 Apr;326:124786. doi: 10.1016/j.biortech.2021.124786. Epub 2021 Feb 1.
In order to compare the effect of different mechanical-chemical coupling treatment on wheat straw and provide guidance for the subsequent preparation of cellulose nanomaterials, this paper systematically explored the impact of different scale mechanical fragmentation coupling various NaOH concentration treatment on the lignocellulosic components, micromorphology and cellulose crystal structure of wheat straw. The results showed that the relationship between hemicellulose and lignin removal with NaOH concentration can be expressed as exponential function Y = a(1-exp(-bX)), and micro-nano-scale ball-milling coupling NaOH treatment can facilitate the removal of hemicellulose and lignin. Micromorphology analysis found that wet ball milling coupling NaOH one-step treatment can disintegrate cellulose fiber into crosslinked network structure of cellulose microfibrils. XRD results indicated that wet ball milling with NaOH solution was contributed to retaining cellulose crystal structure and conducive to cellulose crystalline transformation. In conclusion, wet ball milling coupling NaOH simultaneous treatment can be a promising pretreatment for cellulose nanomaterials preparation.
为了比较不同机械-化学偶联处理对小麦秸秆的效果，为后续纤维素纳米材料的制备提供指导，本文系统地探讨了不同尺度机械粉碎偶联不同 NaOH 浓度处理对小麦秸秆中木质纤维素成分、微观形貌和纤维素晶体结构的影响。结果表明，半纤维素和木质素去除与 NaOH 浓度的关系可以用指数函数 Y=a(1-exp(-bX))来表示，微纳尺度球磨偶联 NaOH 处理可以促进半纤维素和木质素的去除。微观形貌分析发现，湿磨球磨偶联 NaOH 一步处理可以将纤维素纤维分解成纤维素微纤维的交联网络结构。XRD 结果表明，NaOH 溶液湿磨有助于保留纤维素晶体结构，有利于纤维素晶型转变。总之，湿磨球磨偶联 NaOH 同步处理可以作为纤维素纳米材料制备的一种有前途的预处理方法。
