Effects of Porosity Property and Acid Functional Groups of Activated Carbons on Adsorption of Three Flavors
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Abstract:
The adsorption property of two kinds of activated carbons (SY-1 and SY-11) for menthol, furanone and 2-cyclopentenone was investigated. Textural parameters of pore structure and the concentration of acid functional groups were measured by ASAP 2010M and Boehm titration, respectively. The adsorption kinetics of the activated carbons for flavors were determined by static adsorption method, and the desorption activation energies of flavors on the activated carbons were estimated by means of temperature programmed desorption technique (TPD). Results showed that the specific surface areas, average pore sizes, acid functional group contents of SY-1 and SY-11 were 928 and 1065 m2/g 2.3 and 2.6 nm and 0.5498 and 0.5289mmol/g, respectively. The adsorption capacities of SY-1 for three flavors were higher than that of SY-11, for smaller pores was benefit to form stronger force fields for adsorption of flavors and more surface acidic groups provided more adsorption sites for the flavors. The sequence of desorption activation energy for the flavors was: menthol＞furanone＞2-cyclopentenone, which was coincident with their molecular diameters. The molecule with larger diameter needed stronger adsorptive force from the pore surface, and thus the higher activation energy was required.
