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Related Experiment Video

Updated: Jun 6, 2026

Pretreatment of Lignocellulosic Biomass with Low-cost Ionic Liquids
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A designed ZrOCl2/ethylene glycol deep eutectic solvent for efficient lignocellulose valorization.

Yunhua Bai1, Xiong-Fei Zhang1, Mengjiao Yu1

  • 1Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China.

International Journal of Biological Macromolecules
|June 29, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces a novel zirconium-based deep eutectic solvent (DES) for efficient lignocellulose pretreatment in biorefining. The optimized DES system effectively removes hemicellulose and lignin, enhancing cellulose digestibility and enabling solvent recycling.

Keywords:
Acidity regulationDeep eutectic solventEnzymatic conversionPoplar sawdust

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Area of Science:

  • Biomass Pretreatment
  • Green Chemistry
  • Biorefining Technologies

Background:

  • Lignocellulose recalcitrance hinders efficient biomass utilization in biorefining.
  • Deep eutectic solvents (DESs) offer a promising approach for biomass deconstruction.
  • Lewis acidic inorganic salts are effective in cleaving lignin-carbohydrate complexes.

Purpose of the Study:

  • To design and evaluate a novel zirconium-based DES for poplar powder pretreatment.
  • To investigate the role of DES composition in regulating acidity and lignocellulose depolymerization.
  • To assess the efficiency of lignin removal, cellulose digestibility, and DES recyclability.

Main Methods:

  • A zirconium-based DES was synthesized using zirconium oxychloride octahydrate (ZrOCl2·8H2O) and ethylene glycol (EG).
  • The acidity of the DES was characterized using Kamlet-Taft solvatochromic parameters.
  • Poplar powder was pretreated under varying DES compositions, followed by lignin removal, cellulose enzymatic digestion, and DES recycling analysis.

Main Results:

  • The optimal Zr-based DES (1:2 ZrOCl2·8H2O:EG molar ratio) removed nearly 100% hemicellulose and 94.7% lignin.
  • Pretreated cellulose residues achieved 94.4% enzymatic digestion efficiency.
  • Recovered lignin had low polydispersity (1.7), and the DES demonstrated high recyclability with sustained efficiency.

Conclusions:

  • The developed Zr-based DES is highly effective for lignocellulose pretreatment, significantly improving biomass valorization.
  • The tunable acidity of the DES allows for optimized biomass deconstruction.
  • This technology presents a sustainable and efficient method for biorefining applications.