Fixed bed modelling for acid dye adsorption onto activated carbon

Vinci K.C. Lee, John F. Porter, Gordon McKay*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

The adsorption of three separate acid dyes onto activated carbon has been studied using fixed bed adsorption. A film-pore diffusion model was developed and applied to the experimental breakthrough curve data. A sensitivity analysis showed that pore diffusion was the dominant mass transport mechanism. Pore diffusion coefficients were determined by an optimization routine with a minimization of the sum of errors squared. The external mass transfer coefficients were sensitive to the external fluid dynamic parameters, such as liquid flow rate and mean particle size. These fluid dynamic parameters did not affect the effective diffusion coefficient. The effective diffusion coefficient was not affected by changes in the fluid dynamic parameters but did change with differing initial dye concentrations. This may be due to a contribution from surface diffusion to the effective diffusion coefficient.

Original languageEnglish
Pages (from-to)1281-1289
Number of pages9
JournalJournal of Chemical Technology and Biotechnology
Volume78
Issue number12
DOIs
Publication statusPublished - Dec 2003
Externally publishedYes

Keywords

  • Carbon
  • Dyes
  • Film-pore diffusion
  • Optimization

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