D-glucose-derived S-doped porous carbon: Sustainable and effective CO2 adsorption

The escalating atmospheric CO2 levels, largely driven by fossil fuel consumption, necessitate the development of sustainable CO2 capture technologies. This study introduces a green and cost-effective method for synthesizing sulfur-doped porous carbon spheres from biomass D-glucose via hydrothermal processing and chemical activation using sodium thiosulfate (Na2S2O3) on contrary to corrosive and harsh activating method. Activation parameters, including temperatures and Na2S2O3 quantities, were systematically optimized to enhance the adsorbents structural properties and sulfur content. The optimal sample achieved exceptional CO2 uptake of 4.65 mmol center dot g-1 at 0 degrees C and 2.93 mmol center dot g- 1 at 25 degrees C, outperforming some conventional adsorbents. It was found that sulfur doping notably enhanced CO2 affinity via acid-base and polar interactions, while the narrow microporosity optimized adsorption efficiency. The material demonstrated outstanding CO2/N2 selectivity of 20, rapid adsorption kinetics, and robust reusability over five cycles with negligible capacity loss, highlighting its practicality for flue gas CO2 capture. This study pioneers an eco-friendly approach for creating high-performance carbon-based adsorbents, offering promising solutions for mitigating climate change through sustainable CO2 capture.