Diffusion Coefficient of Porous Solid Obtained from Isothermal Sorption Tests

摘要

In this study, a mathematical equation was derived to seperate the diffusioncoefficient and the surface emission coefficient in Newman's solution of the unsteady-state-diffusion equation from an experimental sorption curve. Based on this derived equation, a theoretical expression for the diffusion coefficient was also derived. Results of the present study for sorption complement those of a previous study for desorption. Corresponding resulting equations for sorption and desorption are not the same, and application of these equations must be carried out with discretion.