Chromium adsorption in olive stone activated carbon

Milton Rogério Pereira, Pedro Augusto Arroyo, Maria Angélica Simões Dornellas De Barros, Viviane Monteiro Sanches, Edson Antonio Da Silva, Isabel Maria Fonseca, Rafael García Lovera

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

In this work, Cr(III) adsorption on activated carbon obtained from olive stones in an upflow fixed-bed column at 30°C was studied. The flow rate influence on the breakthrough curves at a feed concentration of 0.87 meq/L was investigated in an attempt to minimize the diffusional resistances. Breakthrough curves for a flow range of 2-8 mL/min were obtained at 10.5 cm bed height and inlet diameter of 0.9 cm. The mass transfer parameters indicated that the bed minimal resistance was attained at 2 mL/min. Therefore, the data equilibrium was carried out until the bed was saturated at 2 mL/min. The dynamic system generated a favorable isotherm with a maximum chromium uptake of 0.45 meq/g. A column sorption mathematical model was created considering the axial dispersion in the column and the intraparticle diffusion rate-controlling steps. The isotherm was successfully modeled by the Langmuir equation and the mathematical model described the experimental dynamic data adequately for feed concentrations from 0.26 to 3.29 meq/L.

Original languageEnglish
Pages (from-to)155-162
Number of pages8
JournalAdsorption
Volume12
Issue number2
DOIs
Publication statusPublished - 1 Mar 2006

Keywords

  • Activated carbon
  • Adsorption
  • Breakthrough
  • Chromium
  • Olive stones

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