Abstract
Five types of alkali modified activated carbons were tested for low-concentration SO2 adsorption performance investigation. Sips isotherm adsorption model showed the best fitting with adsorption data in the range of 0.25–9 ppm. The relationship between adsorption amount below 60% breakthrough rate and concentration of SO2 can be described by a simple linear model, which facilitates a rapid evaluation of the adsorption lifetime of adsorbents at low concentrations. The adsorption processes at 0.25 ppm were controlled by intraparticle diffusion initially and followed by film diffusion resistance. The adsorption amount at 75% humidity was 4.837 mg/g, which was 20 times higher than that at 25% humidity. With increasing humidity, the ratio of H2SO4/K2SO4 in the main adsorption products increased. Three humidity-based mechanisms for the adsorption of sub-ppm SO2 on alkali modified activated carbon are proposed. The condensed water in pores could benefit transportation of the adsorption product and re-exposing the active sites.
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