freundlich isotherm is applied when the adsorption trend is linear, but in case of exponential increase of the adsorption density langmuir isotherm is prefered.
In fact, it can not have a logical meaning because langmuir is a model and freunlich is an empirical equation.Such a mathematical fit based on statistical data is frequently given by some researchers without comment.In my opinion, the actual result should be presented with support from other data(Surface area, adsorbent and adsorbate properties and temodynamic data), ie either it or the other.
This means that points are fully applicable to langmuir and Frandlj equations It equations used to describe ion exchange operations on the roofs of colloids