AI Summary & Key Takeaways
AI InsightThe isosteric heats of adsorptionwere calculated at 0–35 ◦ C with the range of 20–35 kJ mol1 and 18–23 kJ mol1 for CO2 and CH4 , respectively.According to our findings, bio-based ACs can be used as an effective and alternative adsorbent for capturing differentgas molecules.
📌 3 Key Takeaways
Abstract
Low-cost activated carbon (AC) samples obtained from waste coffee grounds were used for CO2 and CH4adsorption. ACs were prepared by chemical activation and carbonized at three different temperatures. AC carbonizedat 800 ◦ C showed a relatively high surface area (582.92 m2 g1) and high adsorption capacities of 2.6 mmol g1 and1.1 mmol g1 at 25 ◦ C for CO2 and CH4 , respectively. Adsorbent samples were prepared by loading of Fe3+ metalions onto ACs and their adsorption capacities were compared with those of nonloaded ACs. As expected, the loading ofFe3+ metal ions increased the adsorption capacities at all temperatures and the adsorption capacity of Fe3+ -loaded ACcarbonized at 800 ◦ C was 3.1 mmol g1 for CO2 and 1.2 mmol g1 for CH4 at 25 ◦ C. The isosteric heats of adsorptionwere calculated at 0–35 ◦ C with the range of 20–35 kJ mol1 and 18–23 kJ mol1 for CO2 and CH4 , respectively.According to our findings, bio-based ACs can be used as an effective and alternative adsorbent for capturing differentgas molecules.