Abstract
In this study, a deep eutectic solvent (DES) pretreatment using choline chloride (ChCl)/lactic acid (LA), betaine (BE)/LA, and potassium carbonate (PC)/glycerol (GLY) was used to prepare lignocellulose nanofibrils (LCNF). An increase in the reaction temperature (100, 120, and 130 °C) and time (6, 12, and 24 h) caused a decrease in the content of lignin and hemicellulose in lignocellulose (Pinus densiflora S. et Z.). Lignocellulose nanofibrils (LCNFs) were prepared from the DES-treated products using a high-pressure homogenizer. As the lignin content of the DES-treated products decreased, the defibrillation efficiency of the LCNFs improved, resulting in a smaller diameter, longer filtration time, larger specific surface area, higher water retention value, and higher viscosity. DES pretreatment using ChCl/LA was more effective for delignification and improvement of defibrillation efficiency than pretreatment using BE/LA and PC/GLY. A decrease in the lignin content caused an increase in the crystallinity index and crystallite size. The significant delignification due to the ChCl/LA treatment can be attributed to the improved tensile properties of the LCNF nanosheets.
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This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (No. 2018R1A6A1A03025582) and National Institute of Forest Science (FP0701-2021–02-2022) grant.
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Park, CW., Gwon, J., Han, SY. et al. Effect of deep eutectic solvent pretreatment on defibrillation efficiency and characteristics of lignocellulose nanofibril. Wood Sci Technol 57, 197–209 (2023). https://doi.org/10.1007/s00226-022-01444-4
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DOI: https://doi.org/10.1007/s00226-022-01444-4