Influence of adsorption temperature using KOH activated biochar

https://doi.org/10.1016/j.seppur.2022.121131

“CO₂ adsorption isotherms on BBC-KOH at six temperatures are investigated. While swelling of adsorbents causes errors in CO₂ adsorption isotherms as pressure increases, CO₂ adsorption isotherms are widely used to determine thermal performance of CO₂ adsorption under thermodynamics. Additionally, the measurement error for adsorption ability is negligible at room temperature and pressure [49]. As shown in Fig. 4, CO₂ adsorption capacities perform incrementally at different temperatures whilst relative pressure increases. Moreover, CO₂ uptake capacities are enhanced under the same pressure when the temperature decreases from 80 °C to 25 °C. For high pressure of 1.0 bar, CO₂ adsorption performance of biochar at 25 °C is significantly better, which suggests a capacity of 3.38 mmol·g⁻¹, nearly three times that at 80 °C (1.21 mmol·g⁻¹).”

“Fig. 4. CO₂ adsorption isotherm of BBC-KOH at various adsorption temperatures.” https://doi.org/10.1016/j.seppur.2022.121131