Adsorption Isotherm, Differential Heat, Entropy and Thermokinetics of Benzene Vapor in Pakistan Bentonite

As a result of changes in the chemical structure of rocks under various influences, clay minerals are formed in nature. Aluminum oxide and silicon oxide serve as the basis of clay minerals. By determining the specific surface area of mineral adsorbents of molecular adsorption in different shapes and structures, the study of the laws of surface chemistry on the basis of the laws awakens a great interest. Based on the energy properties formed during the adsorption of adsorbate molecules, it is possible to determine the structure of the bentonite-forming layers, the migration of cations. Owing to the low charge value and weak electrostatic interaction between the three-layer surface and the multi-layer cations, minerals of the montmorillonite group are capable of multilayer sorption of various substances - cations, water molecules and many organic compounds. Saying differently, the processes of metabolism, absorption and desorption of substances in this group of minerals can occur not only on the outer but also on the inner surfaces of crystallites. The data obtained contribute greatly to the development of the theory of adsorption forces and intermolecular interactions. Determination of adsorption isotherm, differential heat and thermokinetics of benzene in Pakistan bentonite was carried out using adsorption calorimetry method in high vacuum adsorption device. They are based on differential molar entropy and free adsorption energy. The mechanism of benzene adsorption on this bentonite has been fully elucidated. Adsorption isotherms were described using BET and Langmuir equations.

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