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Extraction of Lignin with High β-O-4 Content by Mild Ethanol Extraction and Its Effect on the Depolymerization Yield
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Ultrasonic-enhanced photocatalysis through piezoelectric and cavitation effects for lignin depolymerization
Jiakang Liang1, Jingyi Han1, Man Zhou1
1School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China.
International Journal of Biological Macromolecules
|March 2, 2024
Summary
This study developed novel MoS2/ZnO catalysts for efficient lignin depolymerization using combined ultrasonic and photocatalysis. The synergistic approach significantly enhanced the generation of hydroxyl radicals (·OH), leading to high conversion rates for both model compounds and alkali lignin.
Area of Science:
- Materials Science
- Catalysis
- Renewable Energy
Background:
- Photocatalysis shows promise for lignin depolymerization but suffers from low efficiency.
- Developing efficient and green methods for lignin valorization is crucial for a sustainable chemical industry.
Purpose of the Study:
- To develop efficient MoS2/ZnO heterojunction catalysts for lignin depolymerization.
- To investigate the synergistic effects of ultrasonic-induced piezoelectric fields and photocatalysis.
- To analyze the role of hydroxyl radicals (·OH) in the depolymerization process.
Main Methods:
- Synthesis of MoS2/ZnO heterojunction catalysts via Zn ion intercalation.
- Utilizing ultrasonic treatment to induce piezoelectric fields and enhance catalyst-substrate interaction.
- Employing a combined ultrasonic-photocatalytic approach for depolymerizing phenoxyphenylethanol (PP-ol) and alkali lignin (AL).
Main Results:
- MoS2/ZnO catalysts demonstrated enhanced piezocatalytic and photocatalytic activity.
- The synergistic effect reduced photogenerated charge recombination, increasing ·OH generation.
- Achieved 95.8% conversion of PP-ol and 33.2% depolymerization of AL within 3-4 hours.
- Demonstrated efficient lignin depolymerization with reduced solvent usage (20% acetonitrile).
Conclusions:
- The combined ultrasonic-photocatalytic strategy offers a green and efficient pathway for lignin depolymerization.
- MoS2/ZnO heterojunctions show significant potential for biomass conversion and valorization.
- Understanding the synergistic interplay is key to optimizing catalytic processes for lignin breakdown.
