The homogeneous particle diffusion model (Eq. (6)) was subse- quently applied to determine the effective diffusion coefficient for pyridine adsorption on MN 200 and MN 500 at various conditions, by making least-squares fit between this equation and the experimental adsorption kinetic data (q vs t profiles) of the micropore diffusion region indicated by the Weber-Morris plot to meet the minimised average relative deviation in percentage (ARD):