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Multisite photocatalytic depolymerization of lignin model compound utilizing full-spectrum light over magnetic
Chengcheng Suo1, Wei Li1, Sha Luo1
1Key Laboratory of Bio-based Material Science and Technology (Ministry of Education), College of Material Science and Engineering, Northeast Forestry University, Harbin 150040, China.
Iscience
|November 3, 2023
Summary
Magnetic microspheres efficiently depolymerize lignin using full-spectrum light. This process, enhanced by cobalt, ruthenium, and titanium dioxide doping, achieves over 90% depolymerization, offering a valuable lignin utilization method.
Area of Science:
- Materials Science
- Catalysis
- Chemical Engineering
Background:
- Lignin valorization is crucial for sustainable chemical production.
- Photocatalytic depolymerization offers a high value-added route for lignin utilization.
- Developing efficient catalysts for broad light spectrum response is essential.
Purpose of the Study:
- To synthesize magnetic microspheres (FeCoRu@SiO2-TiO2) for enhanced photocatalytic lignin depolymerization.
- To investigate the effect of Co, Ru, and TiO2 doping on catalyst performance under visible and UV light.
- To elucidate the mechanism of lignin model compound depolymerization using electron paramagnetic resonance (EPR).
Main Methods:
- Co-precipitation method for synthesizing FeCoRu@SiO2-TiO2 magnetic microspheres.
- Photocatalytic depolymerization experiments using lignin model compounds.
- Electron paramagnetic resonance (EPR) spectroscopy to study reaction intermediates and mechanisms.
Main Results:
- Synthesized FeCoRu@SiO2-TiO2 microspheres exhibited enhanced photocatalytic activity.
- Depolymerization rate of lignin model compounds exceeded 90%.
- EPR studies revealed a two-step reaction mechanism involving O2- radical formation via C-O bond cleavage in the aerobic phase.
Conclusions:
- The developed magnetic microspheres demonstrate efficient full-spectrum photocatalytic activity for lignin depolymerization.
- The study provides insights into the photocatalytic depolymerization mechanism, highlighting the role of oxygen.
- Further catalyst optimization is needed to enhance radical production and overall performance.
