摘要
采用酸性离子液体1-丁基-3-甲基咪唑硫酸氢盐([Bmim][HSO4])/1,4-丁二醇/水体系对椰壳纤维进行组分分离,采用亚氯酸钠对综纤维素进行漂白处理得到纯纤维素,利用酸水解-超声波辅助法制备纳米纤维素。采用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、傅里叶红外光谱(FT-IR)仪、X射线衍射(XRD)仪、热重分析(TG)对纳米纤维素的形貌、化学成分、结晶度、热性能进行表征,并探讨了[Bmim][HSO4]对纳米纤维素得率及性能的影响。结果表明:[Bmim][HSO4]提高了木质素脱除率,提高了纤维素的易处理性,有利于纯纤维素的制备;椰壳纤维纳米纤维素仍具有纤维素的基本化学结构和结晶结构,属于纤维素I型;离子液体使得综纤维素质量损失率提高,进而导致纳米纤维素得率降低;椰壳纤维纳米纤维素纤丝平均长度(271±81)nm,平均直径(6.3±1.8)nm,[Bmim][HSO4]对纳米纤维素粒径尺寸分布(3~9 nm)无明显影响。
The main components of coconut husk fibers was separated by the 1,4-butylene glycol/water system combined with 1-butyl-3-methylimidazolium hydrogen sulfate（ [Bmim][HSO4]） as a catalyst,and the cellulose-rich material was subjected to bleaching treatment of sodium chlorite to obtain pure cellulose. Then,the nanocellulose was prepared by acid hydrolysis followed by ultrasonication. The morphological behavior,chemical characterization,crystallinity index,thermostability of nanocellulose were characterized by scanning electron microscopy（ SEM）,transmission electron microscopy（ TEM）,Fourier transform infrared spectroscopy（ FT-IR）,X-ray diffraction（ XRD） and thermogravimetric analysis（ TG）. The effects of [Bmim][HSO4]on the yield and properties of nanocellulose were investigated. The results showed that [Bmim][HSO4]the extraction rate of lignin and the disposability of the cellulose,which was beneficial to the preparation of pure cellulose. Nanocellulose from coconut husk fibers still maintain the basic chemical structure and the cellulose I crystalline structure. The [Bmim][HSO4]increased the mass loss rate of the cellulose,which led to the decrease of the nanocellulose yield. The nanocellulose from Coconut husk fiber based on ionic liquid exhibited an average length of（ 271 ± 81） nm and a diameter of（ 6. 3 ± 1. 8） nm. [Bmim][HSO4] had no significant effect on the size of diameter（ 3-9 nm）.
出处
《林产化学与工业》
EI
CAS
CSCD
北大核心
2017年第5期139-145,共7页
Chemistry and Industry of Forest Products
基金
国家级大学生创新训练项目资助(201510225009)
