Variable diffusivity homogeneous surface diffusion model and analysis of merits and fallacies of simplified adsorption kinetics equations

V.J. Inglezakis, M.M. Fyrillas, J. Park

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Adsorption and ion exchange phenomena are encountered in several separation processes, which in turn, are of vital importance across various industries. Although the literature on adsorption kinetics modeling is rich, the majority of the models employed are empirical, based on chemical reaction kinetics or oversimplified versions of diffusion models. In this paper, the fifteen most popular simplified adsorption kinetics equations are presented and discussed. A new versatile variable-diffusivity two-phase homogeneous diffusion model is presented and used to evaluate the analytical adsorption models. Aspects of ion exchange kinetics are also addressed.
Original languageEnglish
Pages (from-to)224-245
Number of pages22
JournalJournal of Hazardous Materials
Volume367
Early online date21 Dec 2018
DOIs
Publication statusPublished - 5 Apr 2019

Keywords

  • adsorption
  • ion exchange
  • numerical models
  • kinetics
  • batch systems
  • analytical solutions
  • HSDM
  • variable diffusivity

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