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Continuous Flow Removal of Anionic Dyes in Water by Chitosan-Functionalized Iron Oxide Nanoparticles Incorporated in a Dextran Gel Column

1
Department of Applied Chemistry, School of Applied Chemical Engineering, Kyungpook National University, Daegu 41566, Korea
2
Department of Chemistry, Kyungpook National University, Daegu 41566, Korea
3
Department of Advanced Process Technology and Fermentation, World Institute of Kimchi, Gwangju 61755, Korea
4
School of Environmental Engineering, University of Seoul, Seoul 02504, Korea
*
Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(8), 1164; https://doi.org/10.3390/nano9081164
Received: 19 July 2019 / Revised: 30 July 2019 / Accepted: 10 August 2019 / Published: 14 August 2019
(This article belongs to the Special Issue Nanomaterials and Nanotechnology in Wastewater Treatment)
This paper describes a novel chromatographic method for efficient removal of anionic dyes from aqueous solutions. Chitosan-coated Fe3O4 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. View Full-Text
Keywords: iron oxide nanomaterials; anionic dye; purification; immobilization; nanocomposite; remediation; chromatography iron oxide nanomaterials; anionic dye; purification; immobilization; nanocomposite; remediation; chromatography
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Lee, S.Y.; Shim, H.E.; Yang, J.E.; Choi, Y.J.; Jeon, J. Continuous Flow Removal of Anionic Dyes in Water by Chitosan-Functionalized Iron Oxide Nanoparticles Incorporated in a Dextran Gel Column. Nanomaterials 2019, 9, 1164.

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