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Adsorption: Fundamental Aspects and Applications of Adsorption for Effluent Treatment Publisher



Lima EC1 ; Dehghani MH2, 9 ; Guleria A3 ; Sher F4 ; Karri RR5 ; Dotto GL6 ; Tran HN7, 8
Authors

Source: Green Technologies for the Defluoridation of Water Published:2021


Abstract

In this chapter, it will be given the definitions of adsorption, chemisorption, and physisorption. Subsequently, it is presented the equilibrium of adsorption with several isotherm models using nonlinearized plots. The obtention of each equilibrium constant in L/mg is also shown. Each of these constant needs to be converted into L/mol before calculating the thermodynamic equilibrium constant. Once obtained, the thermodynamic equilibrium-constant is used for being applied in linearized and nonlinear van t Hoff equation. Statistical evaluation of the models using R2, R2 adj, and Bayesian information criterion values (BIC). The kinetic models (based on chemical reactions, empiric kinetic models, and diffusive models) were explored. Moreover, the comparison of linear and nonlinear pseudo-first-order and pseudo-second-order kinetics model and Langmuir isotherm model was performed. The results showed that it is always advisable to use nonlinear fitting for isotherms and mainly for kinetics of adsorption. © 2021 Elsevier Inc. All rights reserved.
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