Biomass Waste Turning into Low-Cost Microporous Carbon Adsorbents for Post-Combustion CO₂ Capture

Sustainable microporous carbon materials were synthesized from Stecrculia foetida shell biomass, activated by H₃PO₄ at constant carbonization temperatures. The synthesized carbon materials were used to evaluation of CO₂ adsorption performance in the temperature range from 25 to 50°C. The results of the characterization showed that these carbons have microporosity and a large surface area. The adsorption capacity of SFPA13 was 2.62 mmol/g at 25°C, after the activation with biomass–H₃PO₄ in the ratio of 1 : 3 ratio followed carbonization at 850°C. Physical-chemical characteristics of the adsorbents explain their high adsorption capacity. The carbon materials exhibited easy desorption and recyclable up to five cycles with consistent CO₂ adsorption. This work may offer a new idea for transforming biomass waste into cost-effective porous carbonaceous adsorbents that might be used for enhance the CO₂ capture to succeed in the pursuit of a green economy.