Is it possible to calculate enthalpy using Freundlich or langmuir ISOTHERM? if yes then could you please tell me the quations from which we can calculate so. If no then why?
Of course you can. We did this often and published the methodology some time ago in here:
Article A preliminary evaluation of the CO2 storage potential in unm...
The isosteric enthalpy of adsorption can be calculated by a combination of the Clausius–Clapeyron relationship and corresponding adsorption models. However, if the gas pressure is too high (>10 MPa), you have to consider the real gas behaviour and the contribution of the adsorbed phase. Under this scenario, you can use the methods developed in following work, which allow you accurately calculate the true isosteric enthalpy of adsorption without any approximations.
Thermodynamic analysis of high pressure methane adsorption in Longmaxi shale. Fuel, 193, 411-418.
@ Xu Tang thankyou sir for the valuable information but I want to calculate adsorption enthalpy of adsorption of liquid adsorbate over solid adsorbent not in gas phase .
a plot of lnK VS 1/T should give you straight line with a slope being the heat of adsorption/gas constant.
