Carbon dioxide (CO₂) intake plays a vital role in sustaining the environmental balance by influencing global carbon dynamics and climatic stability. This work addresses the production of sulfur-doped porous nanocarbons (SDCs) as prospective sorbents for CO₂ capture. SDCs were fabricated by utilizing coconut shell as a carbon precursor and potassium persulfate as both a chemical activating agent and a sulfur dopant. The incorporation of sulfur functionalities into carbon matrices creates structural variability and active sites, boosting CO₂ absorption capabilities. Sulfur's peculiar electrical structure allows greater intermolecular interactions with CO₂, enhancing adsorption affinities. According to the experimental data, the CO₂ uptake was best measured as 3.37 mmol/g at 0 °C and 1 bar and 2.56 mmol/g at 25 °C and 1 bar. The results show that the higher porosity of SDC materials adds to a large amplification in the CO₂ uptake capability. The work underlines the delicate interaction between sulfur doping, morphological porosity, and surface reactivity in enhancing the effectiveness of CO₂ sequestration. SDC materials hold considerable promise in tackling the present ecological concerns and developing CO2₂collection techniques. The suggested single-step synthesis technique described here provides a sustainable and environmentally friendly method for synthesizing SDCs for carbon capture applications.