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Rice Husk Hydrolytic Lignin Transformation in Carbonization Process
Svetlana Yefremova1, Abdurassul Zharmenov2, Yurij Sukharnikov2
1National Center on Complex Processing of Mineral Raw Material of the Republic of Kazakhstan RSE, Almaty 050036, Kazakhstan. s_yefremova@cmrp.kz.
Molecules (Basel, Switzerland)
|August 28, 2019
Summary
This study explores rice husk lignin's transformation during carbonization, revealing silica
Area of Science:
- Materials Science
- Polymer Chemistry
- Biomass Conversion
Background:
- Lignin, a byproduct of rice production, offers potential for valuable material development.
- The properties of lignin-derived products are highly dependent on the initial lignin precursor quality.
Purpose of the Study:
- To investigate the structural transformations of rice husk lignin during carbonization.
- To understand the influence of silica on lignin's thermal degradation and carbonization behavior.
Main Methods:
- Lignin isolation via thermal hydrolysis with dilute sulfuric acid.
- Characterization using elemental analysis, IR, TPD-MS, XRD, TEM, and EPR.
- Analysis of carbonized products obtained under various conditions.
Main Results:
- Lignin degradation occurs across a broad temperature range (220-520 °C).
- Silica presence enhances thermal stability by reducing volatile compound evaporation.
- Carbonization generates free radicals, which decrease with the formation of graphite-like structures.
- The quantity and structure of the graphite-like phase are influenced by carbonization conditions.
Conclusions:
- Rice husk lignin can be transformed into materials with prospective performance properties.
- Silica plays a crucial role in modifying the thermal behavior and final structure of carbonized lignin.
- The resulting carbonized products, including carbon fibers and nanoparticles, show promise for various applications.
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