The Langmuir isotherm is a model used to describe the adsorption of a substance onto a surface. The isotherm describes the relationship between the concentration of the substance in the gas phase and the amount of substance adsorbed onto the surface.
The Langmuir isotherm is defined as:
Q = Qmax * C / (1 + bC)
where Q is the amount of substance adsorbed (mg/g), Qmax is the maximum amount of substance that can be adsorbed onto the surface (mg/g), C is the concentration of the substance in the gas phase (mg/L), and b is the Langmuir constant (L/mg).
The Langmuir isotherm assumes that adsorption occurs through a process of monolayer formation, where each site on the surface can only adsorb one molecule of the substance. The Langmuir constant b represents the energy required for adsorption to occur, and Qmax represents the maximum number of sites available for adsorption.
The Langmuir isotherm can be used to calculate the amount of substance adsorbed onto a surface given its concentration in the gas phase, or vice versa. It can also be used to calculate the Langmuir constant b, which can provide information about the energy required for adsorption to occur, and Qmax, which can provide information about the maximum number of sites available for adsorption.
