Heavy metals adsorption by novel EDTA-modified chitosan-silica hybrid materials

Eveliina Repo, Jolanta K. Warchoł, Amit Bhatnagar, Mika Sillanpää

Research output: Contribution to journalArticlepeer-review

281 Citations (Scopus)

Abstract

Novel adsorbents were synthesized by functionalizing chitosan-silica hybrid materials with (ethylenediaminetetraacetic acid) EDTA ligands. The synthesized adsorbents were found to combine the advantages of both silica gel (high surface area, porosity, rigid structure) and chitosan (surface functionality). The Adsorption potential of hybrid materials was investigated using Co(II), Ni(II), Cd(II), and Pb(II) as target metals by varying experimental conditions such as pH, contact time, and initial metal concentration. The kinetic results revealed that the pore diffusion process played a key role in adsorption kinetics, which might be attributed to the porous structure of synthesized adsorbents. The obtained maximum adsorption capacities of the hybrid materials for the metal ions ranged from 0.25 to 0.63. mmol/g under the studied experimental conditions. The adsorbent with the highest chitosan content showed the best adsorption efficiency. Bi-Langmuir and Sips isotherm model fitting to experimental data suggested the surface heterogeneity of the prepared adsorbents. In multimetal solutions, the hybrid adsorbents showed the highest affinity toward Pb(II).

Original languageEnglish
Pages (from-to)261-267
Number of pages7
JournalJournal of Colloid and Interface Science
Volume358
Issue number1
DOIs
Publication statusPublished - 1 Jun 2011
Externally publishedYes

Keywords

  • Adsorption
  • Chitosan
  • EDTA
  • Heavy metals removal
  • Hybrid adsorbents
  • Silica gel

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

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