Isotherm Models for Localized Monolayers with Lateral Interactions. Application to Single-Component and Competitive Adsorption Data Obtained in RP-HPLC

Abstract

Single-component and competitive adsorption data of 2-phenylethanol and 3-phenylpropanol on ODS-silica with methanol−water as the mobile phase, which had been previously reported, were reinterpreted. These data were fitted to several isotherm models derived from statistical thermodynamics which consider lateral adsorbate−adsorbate interactions on homogeneous surfaces: the Fowler, Ruthven, and Moreau et al. models. The single-component Kiselev model for specific lateral interactions was extended to account for the competitive adsorption of binary mixtures and for the finite or infinite dimension of the adsorbed associates. These last models were tested using the same set of experimental data. A comparison was made regarding the ability of these models to predict mixed equilibria using only the identified parameters of the single-component isotherms. In this regard, the best results were obtained with the Kiselev model, which considers the formation of both binary and ternary associates on the surface.

Effect of Temperature on the Adsorption of Adenine

“…Furthermore, the Langmuir model is theoretically applicable only to the adsorption of particles onto homogeneous surface sites with no lateral interactions between adjacent particles. Both conditions are contravened for adenine on graphite, which suggests that more mathematically sophisticated models for monolayer adsorption (Quinones and Guiochon, 1996) may yield more quantitatively precise results.…”

Modeling synergistic adsorption of phenol/aniline mixtures in the aqueous phase onto porous polymer adsorbents

“…For binary-solute cases, different isotherm models have been used to correlate single-solute isotherm data and to describe multisolute adsorption isotherms based on the time-consuming iterative algorithm [15,[23][24][25]. One of them, the extended Langmuir model (ELM) [25], based on the mechanism of direct competition for adsorption sites, is the simplest and most widely used model, which is represented by the equation…”

Coupling of Solvent Extraction and Ultrasonic Waves for Regeneration of Spent Activated Carbon after Treatment of Polluted Air with Toluene Vapor

“…6) were used to evaluate the good fit of each model. The best model selected for the experimental data is the one that gives the highest value of the Fisher parameter and minimum MARE criterion (Quiñones & Guiochon, 1996).…”