Adsorption of n-hexane vapors onto non-functionalized hypercrosslinked polymers (hypersol-macronettm) and activated carbon: equilibrium studies
Gheorghe Asachi Technical University of Iasi, Faculty of Chemical Engineering and Environmental Protection, Department of Environmental Engineering and Management, 71 Mangeron Blvd., 700050 Iasi, Romania
Abstract
Two non-functionalized hypercrosslinked polymeric resins type Macronet (MN 202 and MN 250) were employed to remove nhexane vapors from gas phase. A comparison of the equilibrium behavior of these hypercrosslinked resins and a bituminous granular activated carbon was made. The initial n-hexane concentration in the air stream ranged from 2100 to 4500 ppm and the adsorption temperatures were 30 C, 40 C and 50 C. The results showed that the MN 250 presents the higher adsorption capacities of n-hexane, in all studied conditions. The experimental results were fitted to the Freundlich, Langmuir and Dubinin-Raduchkevich equation isotherms, to obtain the characteristic constants of each model. The maximum adsorption capacity for nhexane, determined by using these model isotherms, decreased in the following order: MN 250 > MN 202 = AC 20.
Keywords
VOCs; hexane; adsorption; activated carbon; hypercrosslinked polymeric resins; isotherm