Bridging the Gap: A Quantitative Framework Correlating Static and Dynamic Adsorption Capacities for VOCs Removal Prediction

Volatile organic compounds (VOCs) pose substantial environmental and health hazards. Adsorption is a crucial VOCs control technology, and the advancement of adsorbents is highly dependent on precise characterization via both static and dynamic adsorption measurements. Theoretically, a specific conversion relationship should exist between these two measurement methods. However, due to discrepancies in focus and testing conditions, the differences in adsorption capacities obtained by the two methods often vary considerably and lack regularity. In this study, a quantitative framework was established to bridge the gap between static and dynamic adsorption capacities by correlating them under identical partial pressures. Results indicate that the dynamic saturation adsorption capacity ( Q ds ) is ca. 0.93 times the static adsorption capacity ( Q s ) at the matched partial pressure ( Q ds = 0.93 × Q s ). Additionally, the dynamic penetration capacity ( Q dp ) is systematically related to Q ds through the slope ( k ) of the adsorption isotherm. Furthermore, by normalizing partial pressures ( P/P 0 ), a unified predictive equation ( Q dp = (1–0.15 × k ) × Q ds ) was derived. This equation can predict the concentration-dependent evolution of penetration capacity directly from equilibrium isotherms, effectively eliminating temperature effects and ensuring universal applicability. This research establishes a universal approach for calculating dynamic adsorption performance from static isotherm data, which can guide the development of tailored adsorbents for various industrial scenarios.