Removal of malachite green dye from aqueous solutions by a magnetic adsorbent

C. De Marco, R. S. Mauler, T. S. Daitx, I. Krindges, A. Cemin, L. R. Bonetto, J. S. Crespo, R. Guégan, L. N. Carli, M. Giovanela

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

A magnetic adsorbent was prepared through chemical precipitation using a solution of iron salts and halloysite clay. The obtained material was then characterized and subsequently applied in the removal of malachite green (MG) dye. The pseudo-second-order model was found to explain the adsorption kinetics most effectively, while the equilibrium was well fitted with the Freundlich isotherm model. The data also suggest that MG dye adsorption was spontaneous and exothermic, involving physisorption. Moreover, the adsorbent can be easily separated from the aqueous medium by applying an external magnetic field and reused without significant loss of properties after its regeneration.

Original languageEnglish
Pages (from-to)1089-1101
Number of pages13
JournalSeparation Science and Technology (Philadelphia)
Volume55
Issue number6
DOIs
Publication statusPublished - 2020 Apr 12

Keywords

  • Halloysite
  • adsorption
  • kinetics and thermodynamics parameters
  • magnetite
  • malachite green dye

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Process Chemistry and Technology
  • Filtration and Separation

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