Deep Eutectic Solvent for Separation and Extraction of High Purity Lignin from Salix babylonica and its Characteristics

Authors

  • Yinglong Wu School of Materials and Chemical Engineering, Bengbu University, Bengbu, 233030, China
  • Renyuan Song School of Materials and Chemical Engineering, Bengbu University, Bengbu, 233030, China
  • Zhong Wu School of Materials and Chemical Engineering, Bengbu University, Bengbu, 233030, China
  • Wenxiu Huang School of Chemistry and Materials Science, Langfang Normal University, Langfang, Hebei 065000, China
  • Bangbin Wang School of Materials and Chemical Engineering, Bengbu University, Bengbu, 233030, China
  • Fukang Cui School of Materials and Chemical Engineering, Bengbu University, Bengbu, 233030, China
  • Yu Liu State Key Laboratory of Green Papermaking and Resource Recycling, Key Laboratory of Pulp & Paper Science and Technology of Ministry of Education, Qilu University of Technology (Shandong Academy of Sciences), Jinan, Shandong 250353, PR China;

Keywords:

Deep eutectic solvent, Extracting, Lignin, Intact structure, High purity

Abstract

A choline chloride-based deep eutectic solvent (DES) system utilizing oxalic acid and citric acid as hydrogen bond donors was used for lignin extraction from Salix babylonica biomass under controlled thermal conditions (130 °C). In choline chloride-oxalic acid system, lignin yield increased from 17.2% (1 h) to 66.1% (9 h) and was stabilized after 7 h of extraction. The optimal samples (DES-E1 and DES-E7, 130 °C/1 h and 7 h) showed high purity lignin (> 89%) while maintaining structural integrity. Both DES systems achieved recovery rates (63.3% and 53.6%) of natural lignin content after 7 h, respectively. Spectral characterization identified selective breaking of the β-O-4 bond between the syringyl (S) and guaiacyl (G) units, indicating DES-mediated bond modification. Furthermore, it was found that the carbon-rich macromolecular structure showed a gradual increase in C/O ratio with prolonged reaction time. This investigation provided a thermal regulation strategy for sustainable lignin extraction while establishing a new pathway for the utilization of Salix babylonica biomass through DES driven structural customization.

Downloads

Published

2025-06-26

How to Cite

Wu, Y., Song, R., Wu, Z., Huang, W., Wang, B., Cui, F., & Liu, Y. (2025). Deep Eutectic Solvent for Separation and Extraction of High Purity Lignin from Salix babylonica and its Characteristics. BioResources, 20(3), 6887–6899. Retrieved from https://ojs.bioresources.com/index.php/BRJ/article/view/24679

Issue

Vol. 20 No. 3 (2025)

Section

Research Article or Brief Communication