Synthesis and characterization of maghemite nanocrystals decorated multi-wall carbon nanotubes for methylene blue dye removal

Arvind Kumar Bhakta, Sunita Kumari, Sahid Hussain, Praveen Martis, Ronald J. Mascarenhas, Joseph Delhalle, Zineb Mekhalif

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Résumé

Maghemite nanocrystals decorated multi-wall carbon nanotubes (MWCNTs) magnetic and electronic properties enhanced nanocomposites are synthesized using infrared (IR) irradiation and diazonium chemistry. The present method is simple and very effective as it overcomes the problem faced in the past decade for the decoration of carbon nanotubes (CNTs) with maghemite nanoparticles. The resulting materials are characterized using different techniques such as XPS, TEM, PXRD, STEM, EDX, HRTEM, and UV–Vis spectrophotometry. Firstly, sodium hydroxide treatment leads to the purification of MWCNTs (p-MWCNTs). The p-MWCNTs functionalization with tricarboxylic aryl diazonium salts generated in situ (p-MWCNTs-D3) followed by its impregnation with iron (II) ethylenediammonium sulfate (p-MWCNTs-D3/IEDS) utilizing IR radiation is the key step in homogeneously impregnating functionalized MWCNTs. Calcination of p-MWCNTs-D3/IEDS at 500 °C under argon atmosphere results in a controlled decoration of p-MWCNTs with maghemite nanocrystals (p-MWCNTs/MC). A homogeneous distribution of maghemite nanocrystals (cubic crystal system) on MWCNTs is observed in the size range of 1–6 nm, with a Gaussian mean diameter of ∼ 1.9 nm. To illustrate the applications of p-MWCNTs/MC for the decontamination of pollutants in water, methylene blue (MB), a model pollutant, is used and the performances are compared with the unmodified MWCNTs, Fe 2O 3 nanopowder and a mixture of MWCNTs and Fe 2O 3 nanopowder (1:1). Successful integration of properties of both constituents (MWCNTs and maghemite nanocrystals) in the new nanocomposite with superior characteristics is proved. The present method is valid for large-scale preparations which also opens very interesting perspectives in nanotechnology.

langue originaleAnglais
Pages (de - à)200-216
Nombre de pages17
journalJournal of Materials Science
Volume54
Numéro de publication1
Les DOIs
étatPublié - 2019

Empreinte digitale

Carbon Nanotubes
Methylene Blue
Nanocrystals
Carbon nanotubes
Coloring Agents
Purification
Dyes
Nanocomposites
Infrared radiation
Sodium Hydroxide
ferric oxide
Decontamination
Argon
Spectrophotometry
Nanotechnology
Impregnation
Electronic properties
Calcination
Energy dispersive spectroscopy
Magnetic properties

Citer ceci

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title = "Synthesis and characterization of maghemite nanocrystals decorated multi-wall carbon nanotubes for methylene blue dye removal",
abstract = "Maghemite nanocrystals decorated multi-wall carbon nanotubes (MWCNTs) magnetic and electronic properties enhanced nanocomposites are synthesized using infrared (IR) irradiation and diazonium chemistry. The present method is simple and very effective as it overcomes the problem faced in the past decade for the decoration of carbon nanotubes (CNTs) with maghemite nanoparticles. The resulting materials are characterized using different techniques such as XPS, TEM, PXRD, STEM, EDX, HRTEM, and UV–Vis spectrophotometry. Firstly, sodium hydroxide treatment leads to the purification of MWCNTs (p-MWCNTs). The p-MWCNTs functionalization with tricarboxylic aryl diazonium salts generated in situ (p-MWCNTs-D3) followed by its impregnation with iron (II) ethylenediammonium sulfate (p-MWCNTs-D3/IEDS) utilizing IR radiation is the key step in homogeneously impregnating functionalized MWCNTs. Calcination of p-MWCNTs-D3/IEDS at 500 °C under argon atmosphere results in a controlled decoration of p-MWCNTs with maghemite nanocrystals (p-MWCNTs/MC). A homogeneous distribution of maghemite nanocrystals (cubic crystal system) on MWCNTs is observed in the size range of 1–6 nm, with a Gaussian mean diameter of ∼ 1.9 nm. To illustrate the applications of p-MWCNTs/MC for the decontamination of pollutants in water, methylene blue (MB), a model pollutant, is used and the performances are compared with the unmodified MWCNTs, Fe 2O 3 nanopowder and a mixture of MWCNTs and Fe 2O 3 nanopowder (1:1). Successful integration of properties of both constituents (MWCNTs and maghemite nanocrystals) in the new nanocomposite with superior characteristics is proved. The present method is valid for large-scale preparations which also opens very interesting perspectives in nanotechnology.",
author = "Bhakta, {Arvind Kumar} and Sunita Kumari and Sahid Hussain and Praveen Martis and Mascarenhas, {Ronald J.} and Joseph Delhalle and Zineb Mekhalif",
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Synthesis and characterization of maghemite nanocrystals decorated multi-wall carbon nanotubes for methylene blue dye removal. / Bhakta, Arvind Kumar; Kumari, Sunita; Hussain, Sahid; Martis, Praveen; Mascarenhas, Ronald J.; Delhalle, Joseph; Mekhalif, Zineb.

Dans: Journal of Materials Science, Vol 54, Numéro 1, 2019, p. 200-216.

Résultats de recherche: Contribution à un journal/une revueArticle

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T1 - Synthesis and characterization of maghemite nanocrystals decorated multi-wall carbon nanotubes for methylene blue dye removal

AU - Bhakta, Arvind Kumar

AU - Kumari, Sunita

AU - Hussain, Sahid

AU - Martis, Praveen

AU - Mascarenhas, Ronald J.

AU - Delhalle, Joseph

AU - Mekhalif, Zineb

PY - 2019

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