I want to fit non-linear Florry-Huggins isotherm by originlab. I have used and fitted my data for different non-linear isotherm models (Langmuir, Freundlich, Dubinin-Radushkevich (D-R), Temkin, Redlich–Peterson(R-P), Sips, Toth, Radke–Prausnitz and Khan) but I cannot build up an equation and fit Florry-Huggins isotherm for my data sets.
If any one have experience I would be grateful if you can explain in building non-linear equation for Florry-huggins isotherm model by originlab program.