Concentrated Solar Combined With Hydrothermal Treatment to Unlock Lignin Graphitization Mechanisms

Area of Science:

• Materials Science
• Sustainable Energy
• Carbon Materials

Background:

• Biocarbons offer sustainable alternatives to fossil-based materials for energy and environmental uses.
• High-temperature production (above 2000°C) necessitates attention to energy consumption and environmental impact.
• Hydrothermal carbonization pre-structures biomass into small graphitic units.

Purpose of the Study:

• To compare conventional and concentrated solar carbonization for biocarbon graphitization.
• To analyze the structural properties of biocarbons produced by different methods.
• To evaluate the efficiency of solar energy in producing high-quality graphitic structures.

Main Methods:

• Hydrothermal carbonization followed by pyrolysis at 800°C to create a graphitization precursor.
• Graphitization of the precursor at 1800°C using both conventional and concentrated solar methods.
• Characterization of resulting biocarbon structures using X-ray diffraction (XRD) and Raman spectroscopy.

Main Results:

• Conventional carbonization at 1800°C produced a turbostratic structure with specific interlayer spacing and graphene layer dimensions.
• Solar carbonization at 1800°C resulted in a heterogeneous structure containing both turbostratic and graphitic phases.
• Solar carbonization achieved higher graphene layer stacking compared to conventional methods.

Conclusions:

• Concentrated solar carbonization is a viable method for producing biocarbons with enhanced graphitic structures.
• Solar carbonization offers potential for improved energy efficiency and sustainability in biocarbon production.
• Further research into optimizing solar carbonization processes is warranted for commercial applications.