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 degreesC, 60 degreesC, 100 degreesC, and 140 degreesC 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.