Fig. 3
From: Adsorption of copper (II) on mesoporous silica: the effect of nano-scale confinement
Surface area normalized adsorption maximum values of Cu calculated from Langmuir, Freundlich, and Dubinin–Radushkevich isotherm models as a function of pore size. *Freundlich adsorption model does not provide an accurate absolute maximum adsorption value; however, can be used to assess relatively adsorption maximums