What is a Langmuir plot?
The Langmuir adsorption isotherm is used to describe the equilibrium between adsorbate and adsorbent system, where the adsorbate adsorption is limited to one molecular layer at or before a relative pressure of unity is reached.
What is Langmuir theory of adsorption?
LANGMUIR ADSORPTION ISOTHERM: In 1916, Irving Langmuir proposed another Adsorption Isotherm which explained the variation of Adsorption with pressure. Based on his theory, he derived Langmuir Equation which depicted a relationship between the number of active sites of the surface undergoing adsorption and pressure.
What do you understand with Langmuir isotherm?
Definition of ‘Langmuir isotherm’ The Langmuir isotherm describes the equilibrium between two phases, the gas phase and the adsorbate phase. A Langmuir isotherm is a classical relationship between the concentrations of a solid and a fluid, used to describe a state of no change in the sorption process.
What is meant by Langmuir isotherm?
The Langmuir isotherm describes the maximum amount of gas that a shale can hold at a specified pressure and temperature. Several factors may result in a shale holding less than the maximum amount of gas as represented by the isotherm. Such shales are termed undersaturated.
What is Langmuir equation form?
Langmuir adsorption isotherm is represented as. mx=1+bpap.
Is Langmuir isotherm linear?
Three most commonly used isotherms (viz. Langmuir, Freundlich isotherm and Redlich-Peterson equation) were studied….Table 1.
| Isotherm | Non-Linear equation | Linear equation |
|---|---|---|
| Langmuir-1 | C e q e = C e q m + 1 bq e | |
| Langmuir-2 | q e = q m bC e 1 + bC e | 1 q e = 1 bq m 1 C e + 1 q m |
What is Langmuir surface area?
BET surface area is measured by specific surface area of the adsorbent. BET surface area is measured by using non-corrosive gases like N2, CO2, Ar etc. BET surface area depends on size and number of gas molecules adsorbed. Langmuir surface area depends on adsorption capacity of the adsorbent.
What is the slope of Langmuir isotherm?
The last linear regression commonly used is the Langmuir linear regression proposed by Langmuir himself in 1918: A plot of (c/Γ) versus (c) yields a slope = 1/Γmax and an intercept = 1/(KΓmax).
Is Langmuir linear?
It is clear from the Table 6 that the linearized Langmuir models (Type-I, Type-II, Type-III and Type-IV), Freundlich and Redlich-Peterson isotherms, Langmuir isotherm Type-1 shows higher r2 value and low error values (i.e., ARED, HYBRID and EABS).
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