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; Regis Guegan; L. N. Carli; M. Giovanela

doi:10.1080/01496395.2019.1585455

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, Regis Guegan, L. N. Carli, M. Giovanela

Global Center for Science and Engineering

Research output: Contribution to journal › Article

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 language	English
Journal	Separation Science and Technology (Philadelphia)
DOIs	https://doi.org/10.1080/01496395.2019.1585455
Publication status	Published - 2019 Jan 1

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Keywords

adsorption
Halloysite
kinetics and thermodynamics parameters
magnetite
malachite green dye

ASJC Scopus subject areas

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

Cite this

De Marco, C., Mauler, R. S., Daitx, T. S., Krindges, I., Cemin, A., Bonetto, L. R., Crespo, J. S., Guegan, R., Carli, L. N., & Giovanela, M. (2019). Removal of malachite green dye from aqueous solutions by a magnetic adsorbent. Separation Science and Technology (Philadelphia). https://doi.org/10.1080/01496395.2019.1585455

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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.",

keywords = "adsorption, Halloysite, kinetics and thermodynamics parameters, magnetite, malachite green dye",

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AU - De Marco, C.

AU - Mauler, R. S.

AU - Daitx, T. S.

AU - Krindges, I.

AU - Cemin, A.

AU - Bonetto, L. R.

AU - Crespo, J. S.

AU - Guegan, Regis

AU - Carli, L. N.

AU - Giovanela, M.

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N2 - 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.

AB - 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.

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10.1080/01496395.2019.1585455