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Ultrasound effect on a biorefinery lignin-cellulose mixture.
Kait Kaarel Puss1, Peeter Paaver2, Mart Loog3
1Institute of Bioengineering, Nooruse 1, Tartu, Estonia; Institute of Chemistry, University of Tartu, Ravila 14a, Tartu, Estonia.
Ultrasonics Sonochemistry
|September 20, 2024
Summary
Ultrasound treatment of wood biomass mixtures, specifically lignin-cellulose, at low dry matter content (<4%) effectively creates nanoscale cellulose particles. This method avoids separation, yielding a stable gel-like material ideal for future material synthesis.
Area of Science:
- Biomass conversion
- Nanomaterials science
- Forest products chemistry
Background:
- Forest biorefineries offer versatile research pathways, focusing on process organization.
- The pretreatment stage is crucial for separating wood biomass components like sugars, lignin, and cellulose.
- Conventional methods prioritize isolating lignin or cellulose, differing from this study's integrated approach.
Purpose of the Study:
- To investigate ultrasound treatment effects on lignin-cellulose mixtures without prior separation.
- To assess the formation of nanocellulose structures with high lignin content (>30%).
- To evaluate the stability of the lignin-cellulose mixture in aqueous conditions.
Main Methods:
- Utilizing a probe system for ultrasound (US) treatment at 20 kHz.
- Investigating variables including amplitude, sonication time, and dry matter content.
- Analyzing particle size, water retention, and nanostructure formation.
Main Results:
- Dry matter content significantly impacts particle size and water retention.
- US treatment of mixtures with <4% dry matter produced a gel-like material.
- Low dry matter (<4%) facilitated better US energy transfer, yielding cellulose nanoparticles (<100 nm).
Conclusions:
- Ultrasound treatment of lignin-cellulose mixtures at low dry matter (<4%) is effective for creating nanocellulose.
- The resulting stable, gel-like material with high lignin content has potential applications.
- This research provides a baseline for developing stable emulsions, filtering materials, and synthesis inputs.
