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Updated: May 15, 2025

Quantitative 31P NMR Analysis of Lignins and Tannins
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Exploring the Characteristics of Carbon Structures Obtained from LignoBoost Lignin.

Adina Coroabă1,2, Irina Apostol1, Ioan Andrei Dascălu1

  • 1"Petru Poni" Institute of Macromolecular Chemistry, Grigore Ghica Vodă 41 A, 700487 Iași, Romania.

Polymers
|May 14, 2025
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Summary

Researchers synthesized novel carbon materials from LignoBoost lignin using a one-pot hydrothermal and thermal treatment. These graphitized, quasi-spherical materials show potential as optical imaging agents due to their unique properties.

Keywords:
carbon dotcarbon structuresfluorescencehydrothermal treatmentlignin

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Biomass Valorization

Background:

  • Lignin, a complex biopolymer, is an abundant byproduct of the pulp and paper industry.
  • Developing efficient methods for lignin valorization into advanced carbon materials is crucial for sustainable chemistry.
  • Existing methods for lignin-derived carbon materials often face challenges in controlling structure and properties.

Purpose of the Study:

  • To synthesize and characterize novel carbon materials from LignoBoost lignin.
  • To investigate the structural, chemical, and optical properties of the synthesized lignin-based carbon materials (LCMs).
  • To evaluate the potential of these LCMs as optical imaging agents.

Main Methods:

  • One-pot hydrothermal treatment of LignoBoost lignin using HNO3/H2SO4, followed by thermal treatment.
  • Characterization techniques included Fourier-transform infrared spectroscopy (FTIR), Dynamic Vapor Sorption (DVS), Dynamic Light Scattering (DLS), X-ray Diffraction (XRD), fluorescence imaging, and Scanning Transmission Electron Microscopy (STEM).
  • X-ray Photoelectron Spectroscopy (XPS) was used to confirm surface charge properties.

Main Results:

  • Synthesized lignin-based carbon materials (LCMs) exhibited a graphitized structure with quasi-spherical morphology.
  • All LCMs displayed a negative zeta potential, attributed to hydroxyl and carboxyl groups, as confirmed by XPS.
  • Characterization data confirmed the heterogeneous composition of LCMs, reflecting the inherent complexity of lignin.
  • Fluorescence imaging indicated promising potential for LCMs as optical imaging agents.

Conclusions:

  • LignoBoost lignin can be effectively converted into graphitized, quasi-spherical carbon materials.
  • The synthesized LCMs possess tunable surface properties and demonstrate potential for biomedical applications.
  • This study highlights a viable pathway for lignin valorization into functional carbon nanomaterials.