Temperature Dependence of Sorption

Understanding how sorption depends on temperature a molecular basis has been made difficult by the coexistence of isotherm models, each assuming different mechanism and routine application planar, multilayer models (such as Brunauer–Emmett–Teller (BET) Guggenheim–Anderson–de Boer (GAB)) beyond their premises. Furthermore, common observation that adsorption isotherms measured at temperatures fall onto single “characteristic curve” when plotted against potential not given clear explanation, due to its ambiguous foundation. Extending our recent statistical thermodynamic fluctuation theory sorption, we have generalized classical isosteric into clarified temperature. We shown characteristic curve exists sorbate number increment contributes purely energetically interface, whereas correlation between entropy drives dependence an isotherm. This rationalizes opposite water vapor activated carbons with uniform versus broad pore size distributions can be applied moisture starch gels. The is convenient variable for in ability unify sorbate–sorbate thermodynamics sorption.