| 초록 |
In most adsorption studies, the equilibrium data obtained were correlated by isotherm equation which can represent experimental data well. Most of isotherm equations contain two or more parameters which can be correlated with temperature, and this temperature dependency allows one to predict adsorption equilibria over broad range of temperature.At present work, however, we applied a thermodynamic method based on the assumption that the isosteric heat of adsorption is independent of temperature, instead of using an isotherm equation which includes the parameters as a function of temperature. The major advantage of this method is that the adsorption equilibria at various temperatures could be estimated using experimental data at only two temperature. In order to verify the usefulness of this method, the adsorption equilibrium experiments of benzene and methylbenzene on an activated carbon were carried out. Measurement were done at 303, 313, 323, 333 and 343K. For the experimental data at 303 and 343K, we employed the Unilan and the Toth equations to calculate the isosteric heat of adsorption. Calculated isosteric heat with an above assumption gives excellent agreement with experimental data at 313, 323 and 333K within 2% error.
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