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bce ›› 2017, Vol. 51 ›› Issue (1): 27-32.doi: 10.3969/j.issn.1673-5854.2017.01.005

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Effect of Enzymatic Pretreatment on Pore Structure of Bleached Wheat Straw Fiber

CHEN Jiajie1, LI Xinping1, CHEN Shuai1, WANG Zhijie1, CHEN Lihong2   

  1. 1. College of Science and Technology, Shaanxi University of Science & Technology, Shaanxi Province Key Laboratory of Papermaking Technology and Specialty Paper, Xi'an 710021, China;
    2. College of chemistry and chemical engineering, Shaanxi University of Science & Technology, Xi'an 710021, China
  • Received:2016-07-22 Online:2017-01-30 Published:2017-01-23

Abstract: In order to study the effect of fiber pore structure on the mechanical dissociation energy consumption during the preparation of microfibriled cellulose(MFC), low-temperature nitrogen adsorption method was used to analyze the effect of different dosages of compound cellulase pretreatment on the pore structure of bleached wheat straw fiber. The results showed that the BET specific surface and total entrance of fiber pore all had "W" type change of decreasing, increasing, then decreasing and increasing again with the increase of dosages of enzyme. By analyzing the changes of pore structure of fiber components after screening, it was found that the pores in cell wall relatively concentrated in fiber fines. And thus the main decreasing factor of BET specific surface and total entrance was the decline of fines content during the lower dosage of enzyme. While the dosage of enzyme was higher, transformation of fiber pores was significantly intensified and the change of porosity in the fiber cell walls was consequently the main factor which influenced the fiber BET specific surface.

Key words: bleached wheat straw fiber, compound cellulase, pore structure

CLC Number: