Xie Hongxiang, Zou Zhufan, Du Haishun, Zhang Xinyu, Wang Xumei, Yang Xianghao, Wang Hui, Li Guangbi, Li Long, Si Chuanling
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.
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。
