通过混合硫酸/草酸水解制备热稳定且表面功能化的纤维素纳米晶体。
Preparation of thermally stable and surface-functionalized cellulose nanocrystals via mixed HSO/Oxalic acid hydrolysis.
作者信息
Xie Hongxiang, Zou Zhufan, Du Haishun, Zhang Xinyu, Wang Xumei, Yang Xianghao, Wang Hui, Li Guangbi, Li Long, Si Chuanling
机构信息
Tianjin University of Science and Technology, Tianjin, 300457, China; Key Laboratory of Bio-based Material Science & Technology (Northeast Forestry University), Ministry of Education, Harbin 150040, China.
Tianjin University of Science and Technology, Tianjin, 300457, China.
出版信息
Carbohydr Polym. 2019 Nov 1;223:115116. doi: 10.1016/j.carbpol.2019.115116. Epub 2019 Jul 26.
A mild and efficient approach for the preparation of cellulose nanocrystals (CNCs) was developed by using mixed HSO/Oxalic acid hydrolysis. In this process, the mixed acid of sulfuric acid, oxalic acid and HO in an optimal mass ratio of 1:5:4 was used to produce CNCs from bleached eucalyptus kraft pulp (BEKP) at 80 °C for 2-5 h. The CNCs with a diameter range of 5-20 nm and a length range of 150-400 nm were obtained at a high yield (>70%) and showed excellent dispersion stability in water and good thermal stability. Moreover, the dosage of sulfuric acid can reduce to 2.4 g/g CNCs in this mixed acid hydrolysis, which is far lower than that of the typical 64% sulfuric acid hydrolysis (55 g/g CNCs, tested in this work). In addition, 91±2% of oxalic acid could be recovered by a simple recrystallization operation.
通过使用硫酸/草酸混合水解法，开发了一种温和且高效的制备纤维素纳米晶体（CNCs）的方法。在此过程中，以1:5:4的最佳质量比混合硫酸、草酸和水的混合酸，在80°C下处理漂白桉木硫酸盐浆（BEKP）2 - 5小时以制备CNCs。获得了直径范围为5 - 20nm、长度范围为150 - 400nm的CNCs，产率高（>70%），在水中表现出优异的分散稳定性和良好的热稳定性。此外，在这种混合酸水解中，硫酸用量可降至2.4 g/g CNCs，远低于典型的64%硫酸水解（本工作中测试为55 g/g CNCs）。另外，通过简单的重结晶操作可回收91±2%的草酸。
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