An adsorption isotherm is a graph that represents the variation in the amount of adsorbate(x) adsorbed on the surface of the adsorbent with the change in pressure at a constant temperature.

Adsorption isotherm is a curve that expresses the variation in the amount of gas adsorbed by the adsorbent with the temperature at constant pressure. In the equation – x/m = k.P1/n (n > 1), ‘k’ and ‘n’ are constants that depend on the nature of the adsorbent and the gas at a particular temperature.

How can I plot the Langmuir adsorption isotherm? ce/qe = 1/qm KL + ce/qm , where ce is the equilibrium concentration of the adsorbate and qe is the adsorption capacity adsorbed at equilibrium, qm is maximum adsorption capacity and KL is the Langmuir adsorption constant.

The variation in the amount of gas adsorbed by the adsorbent at constant temperature with change in pressure is shown by a curve called adsorption isotherm.

isotherm, line drawn on a map or chart joining points with the same temperature. Isotherms are commonly used in meteorology to show the distribution of temperature at the Earth’s surface or on a chart indicating constant level or constant pressure.

The units of KF from Freundlich isotherm are (mg/g)*(L/mg)^1/n and not unitless or L/g or mg/g as expressed in many manuscripts. there is only one case that gives you the sorption capacity (not the maximum adsorption capacity) which is when the solution concetration is 1 mg/L.

Adsorption isotherm is the variation of the mass of the gas (adsorbate) adsorbed per gram of the adsorbent with pressure at constant temperature. The Freundlich adsorption isotherm is the mathematical representation for the variation of the extent of adsorption (x/m) with pressure (P) at a given temperature.

1 : a line on a map or chart of the earth’s surface connecting points having the same temperature at a given time or the same mean temperature for a given period. 2 : a line on a chart representing changes of volume or pressure under conditions of constant temperature.

Adsorption isotherm: A graph drawn between the amount of the gas adsorbed per gram of the adsorbent (x/m) and. temperature ‘t’ at a constant equilibrium pressure of adsorbate gas is known as adsorption isobar.

Definition. Adsorption Isotherm is a curve that expresses the variation in the amount of gas adsorbed by the adsorbent with pressure at constant temperature.

In 1909, Freundlich expressed an empirical equation for representing the isothermal variation of adsorption of a quantity of gas adsorbed by unit mass of solid adsorbent with pressure. This equation is known as Freundlich Adsorption Isotherm or Freundlich Adsorption equation or simply Freundlich Isotherm.

Langmuir Adsorption Isotherm: K =is the equilibrium constant for distribution of adsorbate between the surface and the gas phase . The basic limitation of Langmuir adsorption equation is that it is valid at low pressure only. At lower pressure, KP is so small, that factor (1+KP) in denominator can almost be ignored.

Freundlich Adsorption Isotherm: P is Pressure, k and n are constants whose values depend upon adsorbent and gas at particular temperature . Though Freundlich Isotherm correctly established the relationship of adsorption with pressure at lower values, it failed to predict value of adsorption at higher pressure.