Comparison of solutions for the homogeneous surface diffusion model applied to adsorption systems

Vinci K.C. Lee, Gordon McKay*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)

Abstract

Three solutions to the film surface diffusion mass transport model are discussed. The solutions are based on the homogenous surface diffusion model (HSDM) and are compared using three different adsorption systems. The mass transport solutions include a Crank-Nicholson implicit finite difference method, a semi-analytical solution method and a Cartesian collocation method. The three solutions are compared for accuracy, stability, convergence and computation CPU time. The experimental systems used two adsorbents, activated carbon, a mainly microporous material, and sorbsil silica, a mainly macroporous material. Two categories of adsorbates were selected for the study, phenol, a relatively small organic molecule, which does not ionise, and basic dyes, larger organic structures, which exist as ionisable salts. A range of initial adsorbate concentrations were studied. The range of material types and experimental conditions selected should be sufficient to test and compare the three models under a variety of conditions.

Original languageEnglish
Pages (from-to)255-264
Number of pages10
JournalChemical Engineering Journal
Volume98
Issue number3
DOIs
Publication statusPublished - 15 Apr 2004
Externally publishedYes

Keywords

  • Adsorption systems
  • Cartesian collocation model
  • MMW model
  • WAMM model

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