Synthesis of a novel magnetic Fe3O4/γ-Al2O3 hybrid composite using electrode-alternation technique for the removal of an azo dye

Kyung Won Jung, Brian Hyun Choi, Kyu Hong Ahn, Sang-Hyup Lee

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

A novel magnetic adsorbent of Fe3O4/γ-Al2O3 hybrid composite (denoted as M-Fe/Al-H) was developed electrochemically via a sequential application of iron and aluminum electrodes in a one-pot fashion, which called here as electrode-alternation technique, followed by pyrolysis. Physical and chemical properties of the prepared adsorbents were characterized and their feasibility towards the removal of di-anionic azo dye Acid Black 1 (AB1) was assessed. Textural and structural characterization revealed that the prepared M-Fe/Al-H possesses superior properties than those of M-Fe (sole usage of iron electrode), which may improve the adsorption capacity. Kinetics revealed that the adsorption equilibrium was reached within 12 h with approximately 90% of the equilibrium adsorption capacity within the first 3 h. Comprehensive analysis using the pseudo-second order and intraparticle diffusion models indicated that the dominant mechanism of the reaction is film diffusion with intraparticle diffusion being the rate determining step. The adsorption equilibrium isotherm data were best represented by the Sips isotherm model, which found to be approximately 1501, 1786, and 1959 mg/g at 283, 293, and 303 K, respectively. The exceptional performance as well as its ease of separation allows M-Fe/Al-H to be a promising candidate as an effective for azo dye removal from various aqueous medium.

Original languageEnglish
Pages (from-to)383-393
Number of pages11
JournalApplied Surface Science
Volume423
DOIs
Publication statusPublished - 2017 Nov 30

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Azo Compounds
Azo dyes
Adsorption
Electrodes
Composite materials
Adsorbents
Isotherms
Iron
Aluminum
Chemical properties
Pyrolysis
Physical properties
Kinetics
Acids

Keywords

  • Acid black 1
  • Electrochemical synthesis
  • Gamma alumina
  • Magnetic adsorbent
  • Magnetite

ASJC Scopus subject areas

  • Surfaces, Coatings and Films

Cite this

Synthesis of a novel magnetic Fe3O4/γ-Al2O3 hybrid composite using electrode-alternation technique for the removal of an azo dye. / Jung, Kyung Won; Choi, Brian Hyun; Ahn, Kyu Hong; Lee, Sang-Hyup.

In: Applied Surface Science, Vol. 423, 30.11.2017, p. 383-393.

Research output: Contribution to journalArticle

Jung, Kyung Won ; Choi, Brian Hyun ; Ahn, Kyu Hong ; Lee, Sang-Hyup. / Synthesis of a novel magnetic Fe3O4/γ-Al2O3 hybrid composite using electrode-alternation technique for the removal of an azo dye. In: Applied Surface Science. 2017 ; Vol. 423. pp. 383-393.
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