Adsorption Potential, Kinetic, and Thermodynamic Studies of Halloysite-Based Magnetic Field-Responsive Adsorbent

Johnson Kwame Efavi, Nathaniel Yeboah, Richard Yeboah Abrokwah, Emmanuel Nyankson

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Despite the excellent potential of halloysite nanotubes (HNT) as an adsorbent for water-soluble molecules, their high aqueous dispersity makes it difficult to separate them from the aqueous media after adsorption. This study explores the potential of developing HNT-based magnetic field-responsive adsorbent to facilitate the separation of the HNT from aqueous media after adsorption. Fe3O4 was successfully synthesized from iron salt precursors using maize leaves extracts as reducing and capping agents after which different weight percentages were used to develop Fe3O4–HNT composites. The developed composite materials were characterized using x-ray diffraction, ultra violet–visible light spectrophotometry, scanning electron microscopy-energy dispersive x-ray spectroscopy, Fourier-transform infrared spectroscopy, and thermal gravimetric analysis. The adsorption capacity of the Fe3O4–HNT composite was examined using methylene blue dye and found to be dependent on the percentage of HNT in the Fe3O4–HNT composite. The adsorption kinetics of methylene blue by Fe3O4–HNT was best fitted with the pseudo-second-order adsorption kinetic model. The equilibrium adsorption of methylene blue was best described by the Freundlich isotherm model and the inter particle diffusion model describes the rate-controlling steps. The thermodynamic analysis of the adsorption process revealed that ΔG°, ΔH°, and ΔS° values were dependent on temperature and the amount of HNT in the Fe3O4–HNT composite. The results from the study revealed the potential application of HNT-based magnetic f ield responsive adsorbent in water treatment technologies.

Original languageEnglish
Article number333
JournalWater, Air, and Soil Pollution
Volume233
Issue number8
DOIs
Publication statusPublished - Aug 2022

Keywords

  • Adsorption isotherms
  • Adsorption kinetics
  • FeO
  • Halloysite nanotubes
  • Magnetic field-responsive adsorbent
  • Maize leaves extract
  • Methylene blue
  • Thermodynamics studies

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