School of Chemistry, Monash University, Clayton, VIC 3800, Australia.
BioPRIA, Chemical Engineering Department, Monash University, Melbourne, VIC 3800, Australia.
Carbohydr Polym. 2022 Apr 15;282:119060. doi: 10.1016/j.carbpol.2021.119060. Epub 2022 Jan 5.
This research explains the one-pot process of cellulose fibrillation to procure nanocellulose fibres and water-soluble oxidised cellulose using iron oxide catalysts with hydrogen peroxide. The process involved three stages. First, cellulose underwent depolymerisation to form nanocellulose fibres. Second, nanocellulose was oxidised to a water-soluble product, and the final stage was the complete decomposition. Factors such as the valency of ions in the crystal lattice of catalyst, its particle size, and reaction time influenced the treatment. By controlling these factors, either nanocellulose fibres or water-soluble oxidised cellulose with high yields of 83% and 38% produced, respectively. Nanocellulose had 73% crystallinity with DP (degree of polymerisation), 150, and the dimension of 30-110 nm thickness and 1-5 μm in length. The water-soluble product was oxidised with a carboxyl content of 2.9 mmol/g and DP, 25. This research gave an alternative method and eliminated the need for halogenated reagents, strong acids, and mechanical pretreatments.
本研究采用氧化铁催化剂和过氧化氢，通过一步法将纤维素纤化，制备纳米纤维素纤维和水溶性氧化纤维素。该过程包括三个阶段。首先，纤维素解聚形成纳米纤维素纤维。其次，纳米纤维素被氧化成水溶性产物，最后是完全分解。催化剂晶格中离子的价态、粒径和反应时间等因素影响处理效果。通过控制这些因素，可以分别以 83%和 38%的高产率得到纳米纤维素纤维或水溶性氧化纤维素。纳米纤维素的结晶度为 73%，聚合度（DP）为 150，尺寸为 30-110nm 厚，1-5μm 长。水溶性产物的羧基含量为 2.9mmol/g，DP 为 25。本研究提供了一种替代方法，避免了使用卤代试剂、强酸和机械预处理。
