Langmuir Adsorption Isotherm (θ = Kp/(1+Kp); x/m = aKp/(1+Kp))
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θ = Kp/(1+Kp); x/m = aKp/(1+Kp)
What each symbol means
| Symbol | What it stands for |
|---|---|
| K | Langmuir equilibrium constant (related to adsorption energy) |
| a | Capacity factor (often treated as monolayer capacity in mass form) |
| p | Equilibrium pressure of adsorbate |
| θ | Fraction of surface covered by adsorbate (0 to 1) |
| x/m | Mass adsorbed per unit mass of adsorbent at pressure p |
When to use this
Assumes monolayer adsorption on a uniform surface; no interaction between adsorbed molecules; dynamic equilibrium between adsorption and desorption. Best at moderate pressures before multilayer dominates.