Kinetic modeling of liquid-phase adsorption of reactive dyes on activated carbon

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In this paper, adsorption equilibrium and kinetics of three reactive dyes from their single-component aqueous Solutions onto activated carbon were Studied in a batch reactor. Effects of the initial concentration and adsorbent particle size on adsorption rate were investigated Adsorption equilibrium data were then correlated with several well-known equilibrium isotherm models. The kinetic data were fitted using the pseudo-first-order equation, the pseudo-second-order equation, and the intraparticle diffusion model. The respective characteristic rate constants were presented. A new adsorption rate model based on the pseudo-first-order equation has been proposed to describe the experimental data over the whole adsorption process. The results show that the modified pseudo-first-order kinetic model generates the best agreement with the experimental data for the three single-component adsorption systems. (c) 2005 Elsevier Inc. All rights reserved.
Original languageEnglish
Pages (from-to)25-34
Number of pages10
JournalJournal of Colloid and Interface Science
Issue number1
Publication statusPublished - 1 Jul 2005


  • pseudo-first-order equation
  • pseudo-second-order equation
  • adsorption
  • intraparticle diffusion model
  • kinetics
  • equilibrium


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