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Isolation and characterization of lignocellulosic nanofibers from four kinds of organosolv-fractionated lignocellulosic materials
Wood Science and Technology ( IF 3.4 ) Pub Date : 2020-02-21 , DOI: 10.1007/s00226-020-01167-4
Xiaoyu Wang , Hang Chen , Xinhao Feng , Qijun Zhang , Nicole Labbé , Keonhee Kim , Jingda Huang , Arthur J. Ragauskas , Siqun Wang , Yang Zhang

The objective of this research was to investigate the presence of residual lignin in cellulose fibers on the efficiency and energy consumption during nanofibers processing. Four kinds of lignin-containing cellulose nanofibers (LCNFs) from switchgrass, yellow poplar, hybrid poplar, and pine, respectively, were isolated via organosolv fractionation coupling mechanical grinding. Nanofibrils were observed after organosolv fractionation. The details of their morphological features, chemical structures, water retention value (WRV), and thermal degradation characteristics were revealed and compared. Mean diameters of nanofibers separated from switchgrass, yellow poplar, hybrid poplar, and pine were 27.9 nm, 25.4 nm, 24.6 nm, and 21.5 nm, respectively. The presence of lignin for the four types of LCNFs led to a decrease in energy consumption and an increase in WRV, among which pine nanofibers show the best with an average energy consumption of 0.511 kWh/kg and a WRV of 537%. It was also demonstrated that increasing lignin content for LCNFs could contribute to the sample’s thermal stability. In conclusion, exact benefits of residual lignin for nanofiber will facilitate its preparation process and extend its application.

中文翻译:

四种有机溶剂分离木质纤维素材料中木质纤维素纳米纤维的分离与表征

本研究的目的是研究纤维素纤维中残留木质素的存在对纳米纤维加工过程中的效率和能耗的影响。通过有机溶剂分馏耦合机械研磨,分别从柳枝稷、黄杨、杂交杨和松树中分离出四种含木质素的纤维素纳米纤维 (LCNF)。在有机溶剂分离后观察到纳米纤维。揭示并比较了它们的形态特征、化学结构、保水值(WRV)和热降解特性的细节。从柳枝稷、黄杨、杂交杨和松树中分离的纳米纤维的平均直径分别为 27.9 nm、25.4 nm、24.6 nm 和 21.5 nm。四种LCNFs木质素的存在导致能耗降低和WRV增加,其中松木纳米纤维表现最佳,平均能耗为0.511 kWh/kg,WRV为537%。还证明了增加 LCNF 的木质素含量可能有助于样品的热稳定性。总之,残留木质素对纳米纤维的确切好处将促进其制备过程并扩展其应用。
更新日期:2020-02-21
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