Enhanced and Stable Carbon Capture through Hierarchical Sorbent and Process Optimization Using Biochar from Deoiled...

Area of Science:

• Materials Science
• Environmental Chemistry
• Chemical Engineering

Background:

• Effective carbon dioxide (CO2) capture is crucial for mitigating climate change.
• Conventional adsorbents often lack efficiency and stability in flue gas conditions.
• Developing novel, cost-effective adsorbents from biomass is an active research area.

Purpose of the Study:

• To develop a functionalized biochar adsorbent from deoiled cake biomass for CO2 capture.
• To establish structure-property-performance relationships using an integrated multiparameter optimization framework.
• To evaluate the CO2 capture efficiency and stability of the synthesized biochar.

Main Methods:

• Integrated multiparameter optimization framework for biochar synthesis.
• Response Surface Methodology (RSM) for statistical optimization of process variables.
• CO2 adsorption experiments using simulated flue gas, kinetic and isotherm modeling.

Main Results:

• Optimized biochar synthesized under specific conditions achieved a maximum CO2 uptake of 4.9 mmol/g.
• Adsorbent amount and contact time were identified as key factors influencing CO2 capture.
• Pseudo-second order (PSO) and Langmuir models best described adsorption kinetics and isotherms, respectively.
• The adsorbent demonstrated stable performance over 20 adsorption-desorption cycles.

Conclusions:

• The developed functionalized biochar is a promising material for effective CO2 capture from flue gas.
• The integrated optimization framework successfully identified key synthesis parameters for enhanced adsorbent performance.
• The adsorbent's stability and efficiency suggest potential for practical carbon capture applications.