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Isolation and characterization of lignocellulosic nanofibers from four kinds of organosolv-fractionated lignocellulosic materials

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Abstract

The objective of this research was to investigate the presence of residual lignin in cellulose fibers on the efficiency and energy consumption during nanofibers processing. Four kinds of lignin-containing cellulose nanofibers (LCNFs) from switchgrass, yellow poplar, hybrid poplar, and pine, respectively, were isolated via organosolv fractionation coupling mechanical grinding. Nanofibrils were observed after organosolv fractionation. The details of their morphological features, chemical structures, water retention value (WRV), and thermal degradation characteristics were revealed and compared. Mean diameters of nanofibers separated from switchgrass, yellow poplar, hybrid poplar, and pine were 27.9 nm, 25.4 nm, 24.6 nm, and 21.5 nm, respectively. The presence of lignin for the four types of LCNFs led to a decrease in energy consumption and an increase in WRV, among which pine nanofibers show the best with an average energy consumption of 0.511 kWh/kg and a WRV of 537%. It was also demonstrated that increasing lignin content for LCNFs could contribute to the sample’s thermal stability. In conclusion, exact benefits of residual lignin for nanofiber will facilitate its preparation process and extend its application.

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Acknowledgements

This work was financially supported by SDSU Sungrant Regional Program (A18-0659), Tennessee Experimental Station Project (#TEN00510), the Special Fund for Forest Scientific Research in the Public Welfare (201504603), Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions, and Doctorate Fellowship Foundation of Nanjing Forestry University of China (163020772).

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Correspondence to Siqun Wang or Yang Zhang.

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Wang, X., Chen, H., Feng, X. et al. Isolation and characterization of lignocellulosic nanofibers from four kinds of organosolv-fractionated lignocellulosic materials. Wood Sci Technol 54, 503–517 (2020). https://doi.org/10.1007/s00226-020-01167-4

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  • DOI: https://doi.org/10.1007/s00226-020-01167-4

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