The most common model for monolayer adsorption is the Langmuir isotherm. This model makes several assumptions:
The surface contains a finite number of identical sites. Each site can hold only one adsorbate molecule. Adsorption and desorption are reversible processes. There are no interactions between adsorbed molecules.
Using these assumptions, the Langmuir isotherm equation can be expressed as: θ = (K * P) / (1 + K * P) where θ is the fractional coverage, K is the equilibrium constant, and P is the partial pressure of the adsorbate.
