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Cellulose

, Volume 23, Issue 4, pp 2409–2420 | Cite as

Preparation of cellulose nano-crystals through a sequential process of cellulase pretreatment and acid hydrolysis

  • Xingye An
  • Yangbing WenEmail author
  • Dong Cheng
  • Xuhai Zhu
  • Yonghao NiEmail author
Original Paper

Abstract

In this paper, a cellulase pretreatment was studied prior to the acid hydrolysis to decrease the total acid usage during the cellulose nano-crystals (CNC) preparation from a bleached softwood kraft pulp. Cellulase pretreatment facilitates the subsequent acid hydrolysis to produce CNC with similar quality to that of the control, but at a lower sulfuric acid concentration. The underline mechanism is that cellulase pretreatment led to the formation of more carbonyl groups which can be oxidized into carboxyl groups in the subsequent acid hydrolysis, furthermore, more hydroxyl groups are exposed, thus esterification into sulfonic groups can be enhanced. The results showed that with a cellulase dosage of 4.8 u/g (based on dry pulp) in the pretreatment stage, the sulfuric acid concentration can be decreased from 64 to 40 wt% without compromising the quality of resulting CNC particles. Other results from charge properties, Fourier transform infrared spectroscopy (FT-IR) and transmission electron microscopy (TEM) analyses also supported the conclusions.

Keywords

Cellulose nano-crystals (CNC) Cellulase pretreatment Acid hydrolysis Carbonyl content Charge density Cellulose accessibility 

Notes

Acknowledgments

The authors wish to acknowledge the financial support from the Tianjin Municipal Science and Technology Commission (Grant No. 12ZCZDGX01100).

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Copyright information

© Springer Science+Business Media Dordrecht 2016

Authors and Affiliations

  1. 1.Tianjin Key Laboratory of Pulp and PaperTianjin University of Science and TechnologyTianjinChina
  2. 2.Limerick Pulp and Paper Centre and Department of Chemical EngineeringUniversity of New BrunswickFrederictonCanada

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