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Phosphorylated Lignin-Cellulose Nanofibrils: Elucidating the Preparation Pathway and Structural Features.

Soumia Boukind1, Amira Najahi2, Houssine Khalili3

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This study introduces phosphorylated lignin-cellulose nanofibrils (PLCNFs) from giant reed, offering a sustainable and cost-effective alternative to traditional cellulose nanofibrils. The novel method enhances material properties and flame retardancy, showcasing potential for eco-friendly nanomaterials.

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Area of Science:

  • Materials Science
  • Biomass Valorization
  • Nanotechnology

Background:

  • Lignocellulosic nanofibrils (LCNFs) offer a sustainable alternative to cellulose nanofibrils.
  • Efficient and eco-friendly production methods for LCNFs are needed.
  • Current methods often involve costly lignin removal.

Purpose of the Study:

  • To develop an inexpensive, energy-efficient, and sustainable method for producing multifunctional LCNFs.
  • To create phosphorylated lignin-cellulose nanofibrils (PLCNFs) from unbleached giant reed fibers.
  • To characterize the properties and potential applications of the produced PLCNFs.

Main Methods:

  • Direct phosphorylation of unbleached giant reed fibers using H3PO4/urea.
  • Alkali-swelling and microfluidization for disintegration.
  • Characterization of PLCNF morphology, zeta potential, and rheological behavior.

Main Results:

  • Production of PLCNFs with 22.1 wt% lignin content via a simple, high-yield process.
  • PLCNFs exhibited a width of 3-5 nm, high aspect ratio, and negative zeta potential (-30 mV).
  • Demonstrated shear-thinning behavior and enhanced flame retardancy due to phosphate groups.

Conclusions:

  • An economical and sustainable approach for producing multifunctional PLCNFs from unbleached biomass was established.
  • The developed PLCNFs possess desirable properties for various applications.
  • This work highlights the potential of renewable lignocellulosic resources for advanced nanomaterials.