Hebei Key Laboratory of Advanced Materials for Transportation Engineering and Environment, School of Materials Science and Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China.
Hebei Key Laboratory of Advanced Materials for Transportation Engineering and Environment, School of Materials Science and Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China.
Carbohydr Polym. 2022 Feb 15;278:118946. doi: 10.1016/j.carbpol.2021.118946. Epub 2021 Dec 1.
Here, a facile method to fabricate cellulose nanocrystals (CNCs) with high yield from microcrystalline cellulose (MCC) at room temperature (RT) is achieved by using a new solvent system of zinc chloride (ZnCl) and a little amount of hydrochloric acid (HCl). Compared with sulphuric acid hydrolysis process, about one-fifth mole of acid is used for per gram of CNCs in our protocol. CNCs with rod-like morphology are regenerated with a maximum yield of 35.2% and high crystallinity of 73.8%. Moreover, with an additional 2 h of ball-milling, the yield of CNCs could significantly increase to 66.9% at RT. The possible formation mechanism for CNCs prepared by the solvent system of ZnCl/HCl is proposed. As the first example of isolation of CNCs with high yield at RT using ZnCl, this work provides a facile, energy-saving, and practical strategy for the preparation of cellulose nanomaterials.
在这里，通过使用氯化锌 (ZnCl) 和少量盐酸 (HCl) 的新型溶剂体系，在室温下 (RT) 从微晶纤维素 (MCC) 中高效制备纤维素纳米晶体 (CNC) 的方法得以实现。与硫酸水解工艺相比，我们的方案中每克 CNCs 使用约五分之一摩尔的酸。以最大产率 35.2%和高结晶度 73.8%再生出棒状形态的 CNCs。此外，通过额外的 2 小时球磨，CNCs 的产率可在 RT 下显著提高至 66.9%。提出了使用 ZnCl/HCl 溶剂体系制备 CNCs 的可能形成机制。作为在 RT 下使用 ZnCl 高效制备 CNCs 的首例实例，该工作为纤维素纳米材料的制备提供了一种简便、节能且实用的策略。
