Chem. J. Chinese Universities ›› 2017, Vol. 38 ›› Issue (7): 1286.doi: 10.7503/cjcu20160831

• Polymer Chemistry • Previous Articles     Next Articles

Preparation and Characterization of Bagasse Nanocellulose

LI Caixin, LIANG Xiaorong, GU Ju*()   

  1. College of Materials Science and Engineering,South China University of Technology, Guangzhou 510640, China
  • Received:2016-11-24 Online:2017-07-10 Published:2017-04-18
  • Contact: GU Ju E-mail:psjgu@scut.edu.cn

Abstract:

In comparison with sulfuric acid hydrolysis, three preparation methods without using acid(named as one-step, two-step and three-step methods, respectively) were employed to prepare bagasse nanocellulose(BNC). The spectrum properties, morphological structure, crystallinity and thermal stability of nanocellulose were fully characterized by Fourier transform infrared spectroscopy(FTIR), scanning electron microscope(SEM), X-ray diffraction(XRD) and thermal gravimetric analyzer(TGA). It was found that the size of the as-obtained BNC was at the nanometer level. When dispersed in water with the help of ultrasonication technique, all the BNC suspensions exhibited jelly-like colloid. Furthermore, the results showed that the two BNC samples obtained from three-step method and conventional sulfuric acid hydrolysis were very similar in morphology, both exhibiting rod-like structures with small length to diameter ratio. After ultrasonic processing, the two BNC samples can be evenly dispersed in the aqueous solution to form a stable suspension for more than 30 d. The BNCs, prepared by one-step method and two-step method, exhibited a fibrous structure with large length to diameter ratio and a good quality dispersion in water for 5 d can be achieved. The XRD result revealed that the crystal type of the BNC gained from one-step method contained a part of cellulose Ⅱ crystal and the other three BNCs were only crystal Ⅰ. In conclusion, sulfuric acid hydrolysis would produce a large amount of waste acid. Recycling and disposal of waste acid would increase subsequent processing cost. Compared with the complex sulfuric acid method, the eco-friendly no-acid method could not only enhance the thermal stability of nanocellulose at different levels, but also simplify the production process.

Key words: Bagasse, Nanocellulose, Morphology, Thermal stability

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