Surface Chemistry

The Freundlich adsorption isotherm explains how gases adsorb onto solid surfaces, especially when those surfaces are heterogeneous. The isotherm is described by the equation:$ \frac{x}{m} P k n \frac{1}{n}$ usually lies between 0 and 1, which indicates how intense the adsorption process is. This model effectively describes adsorption across a range of pressures, though it becomes less accurate at very high pressures.Being an empirical equation, the Freundlich adsorption isotherm is based on experimental data and attempts to provide a mathematical fit for the observed behavior rather than deriving from theoretical principles. Its applicability extends to both gases and solutions, showcasing its flexibility in modeling adsorption processes in a variety of experimental contexts.