Comprehensive investigation of important factors governing metal-ion adsorption by an H-type granular activated carbon

J. P. Chen*, M. Lin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

A comprehensive experimental investigation of metal ion adsorption by Filtrasorb 200, an H-type activated carbon, was carried out: Potentiometric titration of the carbon showed that surface charge was increased with a decrease in pH. Its absolute value increased with an increase in ionic strength. Higher pH and ionic strength and lower initial concentration increased the metal-ion removal percentage. The removal capacity for a single metal ion was in the following descending order: Cu > Zn ≃ Co. Experiments with competitive metal ions showed that adsorption of zinc and cobalt ions was reduced dramatically with the addition of copper, while adding zinc or cobalt was less important for copper removal. Kinetic study showed that most copper removal occurred in the first hour and was completed within 4 h. Mass transfer was an important controlling factor in the metal uptake rate. The effect of pH on the removal kinetics seemed to be insignificant; however, higher ionic strength and initial metal concentration can result in faster adsorption. Adsorption kinetics was much faster for copper than for zinc. The addition of competitive metal ions did not affect other metal-ion adsorption kinetics.

Original languageEnglish
Pages (from-to)2063-2081
Number of pages19
JournalSeparation Science and Technology
Volume35
Issue number13
DOIs
StatePublished - Sep 2000
Externally publishedYes

Keywords

  • Adsorption
  • Competitive effect
  • Equilibrium
  • Kinetics
  • Metal ions
  • Multi-component

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