Abstract
The adsorption isotherms achieved at four temperatures of the Iron nitrate and Iron chloride to a biosensor (Porphyrin TPP coated onto Quartz crystal) were simulated using models established through statistical physics formalism. Modeling of experimental isotherms using statistical physics has to offer microscopic interpretations for the mechanism of adsorption. The results showed that the adsorption was exothermic and took place with physisorption. The Iron nitrate adsorption occurred by the formation of multilayer adsorption whereas for Iron chloride the adsorption was monolayer.
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. (C) 2017 Elsevier B.V. All rights reserved.