Adsorption properties of polymer can be investigated by adsorption isotherms in the batch experiments. These isotherms provide a relationship between the concentration of the analyte in solution and that adsorbed on the solid sorbent when the two phases are at equilibrium. Langmuir and Freundlich isotherms are usually used to analyze the sorption data in the IIP (Ion Imprinted Polymer) studie. Is it possible for sorbent to follow both isotherms in the same time?
You can probably fit the data with both isotherms with good dispersion. If Langmuir works fine, don't use Freundlich. Freundlich isotherm with a free power parameter is empirical and its fitting parameters have no physical meaning.
My opinion is in line with the above response. You can find the attached research work useful.
Thank you for your answers and attached paper. I want to know if sorbent surface can be homogenous and heterogeneous at the same time?
You should check the isotherm plot by inspection first. Go immediately for Langmuir if the adsorbed amount saturates at high P (or equilibrium concentration).
Then do linearization with Langmuir isotherm, if it is not good, try Freundlich. Remember that Langmuir has a fundamental basis, in contrast to Freundlich.
Yes, An adsorbent can follow both the isotherm, however the linearty to the some extent may vary. Please find attached paper in this reference.
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