This study explores the development of hierarchical porous carbon materials derived from crab shells (CSs) for efficient CO₂/CH₄ gas separation. Using KOH activation, the researchers optimized synthesis parameters like temperature, activation time, and ratio of activating agents. The CS-2-2-900 sample, activated at 900°C for 1 hour, exhibited the highest CO₂ adsorption capacity of 7.217 mmol/g at 10 bar and 25°C, with a large surface area of 914.85 m²/g and a pore volume of 1.1 cm³/g. Functionalization with amines further enhanced CO₂ selectivity, reaching a CO₂/CH₄ selectivity of 18.99. Using Density Functional Theory (DFT), the study identified pyrrolic nitrogen and carboxylic sites as key active sites for improving CO₂ separation efficiency. The findings highlight crab shell-derived porous carbons as a cost-effective, stable, and eco-friendly solution for gas separation, offering significant potential for CO₂ capture applications.
For more details, please continue reading the full article under the following link:
https://www.nature.com/articles/s41598-024-69565-3
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