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Chemistry and Industry of Forest Products ›› 2017, Vol. 37 ›› Issue (5): 139-145.doi: 10.3969/j.issn.0253-2417.2017.05.019

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Preparationand Characterization of Nanocellulose from Coconut Husk Fibers Based on Ionic Liquids

CAO Fei, ZHAO Xin, HU Yingcheng, CHEN Peipei, LI Huifang   

  1. Key Laboratory of Bio-based Material Science and Technology of Ministry of Education, Material Science and Engineering, Northeast Forestry University, Harbin 150040, China
  • Received:2017-03-14 Online:2017-10-25 Published:2017-10-30

Abstract: 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).

Key words: nanocellulose, 1,4-butylene glycol, ionic liquid

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