Journal
INDUSTRIAL CROPS AND PRODUCTS
Volume 183, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.indcrop.2022.114943
Keywords
Woody oil plants; Camellia oleifera shell; Lignin; Solvothermal fractionation; Lignin nanoparticles
Categories
Funding
- Hunan Forestry Science and Technology Innovation Special Project [XLK201909]
- State Key Laboratory of Woody Oil Resource Utilization Project [2019XK2002]
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This study investigated the water-organic co-solvent for the fractionation of lignin in camellia oleifera shell and the fabrication of lignin nanoparticles. The research found that the highest dissolution of lignin was achieved in H2O/GVL co-solvent, and the LNPs prepared from H2O-ethanol co-solvent showed the smallest particle size and the highest stability. The structural analysis revealed that the lignin nanoparticles maintained their basic structural units.
This study investigated the water-organic co-solvent for the fractionation of lignin in camellia oleifera shell and further fabrication of lignin nanoparticles (LNPs). The highest dissolution (88.6 wt%) of lignin was obtained in H2O/GVL (3/7, v/v) co-solvent, which was mainly ascribed to the adjacent Hildebrand solubility parameter (delta) between lignin and co-solvent. The LNPs prepared by solvent-shifting method and precipitation exhibited round or oval shape with even distribution. Among which, LNPs obtained from the lignin fraction dissolved in H2O-ethanol co-solvent (denoted as LNP-ETH) showed the smallest average particle size of 136 nm and the highest negative zeta potential of -39.6 mV, which implied the relatively stable lignin nanoparticles prepared from H2O-ETH co-solvent. The structural analysis of lignin nanoparticles revealed that LNPs maintained the lignin aromatic skeleton, C-O-C/C-C linkages and basic structural units (G, S and H). So far, this research offered great potential for the preparation of lignin-based materials from abundant forestry waste camellia shell.
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