Abstract
We have modified the standard sulphuric acid hydrolysis method for the production of cellulose nanocrystals (CNCs) to successfully isolate a novel, highly crystalline cellulose material from the spent liquor of CNCs. The novel material has a cellulose II crystal structure that is distinctly different from the cellulose I crystal structure of CNCs. The modified method uses a shorter time for the hydrolysis, followed by maintaining a high residual acid concentration for the separation of the spent liquor and CNCs, and by adding the spent liquor to water. The modified method offers an opportunity to concurrently produce CNCs in up to ~40 % yield and the novel, highly crystalline, sulphated cellulose II in ~15 % yield in separate and pure forms from sulphuric acid hydrolysis of a commercial northern bleached softwood kraft pulp. It can potentially reduce the production cost of CNCs, allow easier downstream processing of CNCs and recovery of sulphuric acid, and generate a new cellulose bio-material for product development.
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Acknowledgements
The authors would like to thank Natural Resource Canada (NRCan) for the Forestry Transformative Technologies funding. They would also like to thank James Drummond for his assistance in the SEM experiment, Michelle Zhao and Dr. Siham Atifi for performing some repeat hydrolysis experiments, Drs. Jean Bouchard and Wadood Hamad for their very careful reviews of the report and excellent feedback, and Gail Sherson and Dr. Gilles Dorris for helpful comments.
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Hu, T.Q., Hashaikeh, R. & Berry, R.M. Isolation of a novel, crystalline cellulose material from the spent liquor of cellulose nanocrystals (CNCs). Cellulose 21, 3217–3229 (2014). https://doi.org/10.1007/s10570-014-0350-z
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DOI: https://doi.org/10.1007/s10570-014-0350-z