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

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, R. Guégan, L. N. Carli, M. Giovanela

Global Center for Science and Engineering

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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 language	English
Pages (from-to)	1089-1101
Number of pages	13
Journal	Separation Science and Technology (Philadelphia)
Volume	55
Issue number	6
DOIs	https://doi.org/10.1080/01496395.2019.1585455
Publication status	Published - 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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10.1080/01496395.2019.1585455

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Removal of malachite green dye from aqueous solutions by a magnetic adsorbent. / De Marco, C.; Mauler, R. S.; Daitx, T. S.; Krindges, I.; Cemin, A.; Bonetto, L. R.; Crespo, J. S.; Guégan, R.; Carli, L. N.; Giovanela, M.

In: Separation Science and Technology (Philadelphia), Vol. 55, No. 6, 12.04.2020, p. 1089-1101.

Research output: Contribution to journal › Article › peer-review

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

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note = "Funding Information: This work was supported by the Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq), Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES), and Funda??o de Amparo ? Pesquisa do Estado do Rio Grande do Sul (FAPERGS). The authors would like to thank CAPES, CNPq, and FAPERGS for their financial support. Publisher Copyright: {\textcopyright} 2019, {\textcopyright} 2019 Taylor & Francis Group, LLC.",

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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 - Guégan, R.

AU - Carli, L. N.

AU - Giovanela, M.

N1 - Funding Information: This work was supported by the Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq), Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES), and Funda??o de Amparo ? Pesquisa do Estado do Rio Grande do Sul (FAPERGS). The authors would like to thank CAPES, CNPq, and FAPERGS for their financial support. Publisher Copyright: © 2019, © 2019 Taylor & Francis Group, LLC.

PY - 2020/4/12

Y1 - 2020/4/12

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.

KW - Halloysite

KW - adsorption

KW - kinetics and thermodynamics parameters

KW - magnetite

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

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