Abstract
Activated carbon is one of the most commonly used porous materials for capturing gaseous pollutants from indoor air. To investigate the adsorption behavior of activated carbon in an indoor environment, the benzene adsorption capacities of 11 commercial activated carbons were measured in the concentration range of 0.05–6 ppmv (parts per million by volume). The method of purging using clean air was used to measure the amount of benzene desorbed from the saturated activated carbons when the concentration decreased to zero. During the experiment, the temperature was 24 ± 2 °C and relative humidity was 45 ± 5%. The specific pore volumes and specific surface areas of the activated carbons were characterized, and their influence on the adsorption and reversible adsorption capacities was analyzed. The results showed that the benzene adsorption capacity has the strongest correlation with the pore volume in the pore width range of 0.6–0.9 nm, while the reversible adsorption capacity has the strongest correlation with the surface area for pore widths larger than 1 nm. Considering the strong correlation between the pore characteristics of the activated carbons and their adsorption behavior for benzene, it may be feasible to predict the adsorption equilibrium of activated carbons at low concentrations using the pore characteristics and empirical correlations.
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