Isotherm model

Parameters

Equation

Langmuir

VL, PL

V = V L p P L + p

Freundlich

K, x

V = K p x

Langmuir-Freundlich

VL, m, b

V = V L ( b p ) m 1 + ( b p ) m

D-R

D, V0

V = V 0 exp [ D ln 2 ( P s / P ) ]

Semi-pore

VL, b, α

V = V L [ 1 exp ( b p α ) ]

Toth

VL, b, k

V = V L b p [ 1 + ( b p ) k ] 1 / k