Adsorption Isotherms of VOCs onto an Activated Carbon Monolith:  Experimental Measurement and Correlation with Different Models

A new material, activated carbon monolith, can be used as an adsorbent to remove volatile organic compounds (VOCs). Vapor−solid adsorption isotherms of three VOCs (toluene, 1-butanol, and ethyl acetate) on an activated carbon monolith were measured at: 20 °C, 60 °C, 100 °C, and 140 °C using a microbalance. The experimental data were correlated with the following adsorption isotherm models: Langmuir, Freundlich, Langmuir−Freundlich, and Toth equations. The Langmuir−Freundlich and Toth equations provided good fits to the experimental data.