Thermodynamic and kinetic study of the adsorption of organic pollutants using environmentally friendly materials

Abstract

An AFM and BET were used to diagnose Flint surface, and the results were displayed. where it was determined that the specific surface area of Flint is 6.2697 m² g^-1. The biggest peak that may be obtained by a certain amount of Flint surface, with granules and an average diameter of 63.84 nm, is 31.0535 nm in height. The aqueous solution of Erythrosine was removed using the adsorption capabilities of Flint. The range of maximal dye adsorption was found to be 10.19-43.77%. At temperatures of (298,308,318,328)K, the Freundlich model was utilized since Temkin model could only be partially applied, Langmuir model was not appropriate, and the Freundlich model was the only one that worked. Reason being, out of the three models, it is the one that will be most useful in the real world.  Physical adsorption is another option. Based on the results, the pseudo-second-order model, One of the three adsorption process kinetic models that were taken into consideration, was significantly applicable. Through the application of thermodynamic functions based on the enthalpy value, it was determined that the process was exothermic, with a negative value of -19.9471 kJ/mol. Similarly, the value of entropy was negative, which was -2.7962 J/mole.K.  The process was shown to be exothermic adsorption, spontaneous, and occurring without randomization when Gibbs free energy was calculated.