Statistical studies of adsorption isotherms of iron nitrate and iron chloride on a thin layer of porphyrin

The parameters deduced from fitting of the experimental data were discussed and interpreted. The statistical models were also used to investigate thermodynamics functions that govern adsorption mechanism, such as entropy, internal energy, and Gibbs free enthalpy. It is shown that the two systems release energy which confirms that the adsorption is exothermic process.