Hi, wish everything goes well with you.

you can go through the link below to get useful information about modeling of an adsorption process using langmuir isotherm and other isotherm models.

good luck

https://www.sciencedirect.com/science/article/pii/B9780128141328000058

Thanks

Hi dear Olugbenga.

There are many adsorption models. How many substances are you evaluating for adsorption?

Anyway, I will give you strong references that I consider that give a very detailed study of evaluation of adsorption models:

Article Kinetic study of α-pinene allylic oxidation over FePcCl16-NH...

Article A review of the kinetics adsorption models and their applica...

Article Kinetic study of the nopol synthesis by the Prins reaction o...

With kind regards!

Julián :)

Useful informations can be fount in the paper: L. (Negrilă) Nemeş, Laura Bulgariu, Optimization of process parameters for heavy metals biosorption onto mustard waste biomass, Open Chemistry, 14, (2016), 175-187

Dear Bulgariu Ma'am

For your better understanding please see the attached file

Regards

Krishna

The various adsorption isotherm equations apply roughly speaking to different degrees of non ideality of the adorbed phase (layer). This applies to both adsorption from solution and to gas adsorption. Below some examples of isotherm equations (apply at contant temp) arementioned. So the choice of an equation should in principle be based on how ideal/non-ideal the system behaves.

Monolayer adsorption monocomponent systems (dilute solutions, low gas pressure)

- Langmuir=ideal monolayer with only interaction with the homogeneous surface; --Frumkin-Fowler-Guggenheim (FFG)= Langmuir extended with lateral interactions in the adsorbed layer;

--Freundlich= adsorption on heterogeneous surfaces in a monolayer without lateral interaction and low coverage; originally seen as a purely empirical equation.

- Langmuir-Freundlich or Sips= same as Freundlich but for adorption up to a complete mono layer

--Stern or Langmuir-Stern= same as langmuir but also electrostatic interaction (with surface and laterally)

These equations have also more complicated analoges for multicomponent adsorption.

Multilayer adsorption (monocomponent, gas pressures up to saturation; not directly for solute adsorption)

--BET=Langmuir like but with multilayer formation with the same adsorption energy for layers>1.

--Frankel-Halsey-Hill (FHH)= multilayer adsorption with gradual decay of the adsorption enthalpy (energy)with distance to the surface, better description for multilayer adsorption than BET

- Polaniy theory= multilayer adsorption, like the FHH (can also be used for solute ads).

Negisa Darajeh

You can see

https://vlab.amrita.edu/?sub=2&brch=190&sim=606&cnt=1

http://www.chemistrylearning.com/langmuir-adsorption-isotherm/

Negisa Darajeh

How to apply Langmuir adsorption isotherm. A complete guidance ..

https://youtu.be/wWIZyxrp04I

How to apply Freundlich adsorption isotherm. A complete guidance

https://youtu.be/fUp5OtxgbEg