Continuous flow removal of anionic dyes in water by chitosan-functionalized iron oxide nanoparticles incorporated in a dextran gel column

Sang Yeob Lee, Ha Eun Shim, Jung Eun Yang, Yong Jun Choi, Jongho Jeon

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

This paper describes a novel chromatographic method for efficient removal of anionic dyes from aqueous solutions. Chitosan-coated Fe3 O4 nanoparticles can easily be immobilized on a dextran gel column. Single elution of Evans Blue (EB) solution to the nanoadsorbent-incorporated columns provides high removal efficiency with a maximum adsorption capacity of 243.9 mg/g. We also investigated the influence of initial concentration and solution pH on the removal efficiency of EB. The electrostatic interaction between the adsorbent surface and negatively charged sulfate groups on EB molecules promotes the efficient adsorption of dyes. The equilibrium data matched well with the Langmuir isotherm model, which indicated monolayer dye adsorption onto the adsorbent surface. To extend the application of the current method, we performed further adsorption experiments using other anionic dyes of different colors (Cy5.5, Acid Yellow 25, Acid Green 25, and Acid Red 1). All of these molecules can efficiently be captured under continuous flow conditions, with higher removal efficiency obtained with more negatively charged dyes. These findings clearly demonstrate that the present approach is a useful method for the removal of anionic dye contaminants in aqueous media by adsorption.

Original languageEnglish
Article number1164
JournalNanomaterials
Volume9
Issue number8
DOIs
StatePublished - Aug 2019

Keywords

  • Anionic dye
  • Chromatography
  • Immobilization
  • Iron oxide nanomaterials
  • Nanocomposite
  • Purification
  • Remediation

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