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

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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, Fe2O3 nanopowder and a mixture of MWCNTs and Fe2O3 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.

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Acknowledgements

Arvind K. Bhakta thanks the University of Namur for a CERUNA doctoral fellowship.

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Authors and Affiliations

  1. Laboratory of Chemistry and Electrochemistry of Surfaces, University of Namur, 61 Rue de Bruxelles, 5000, Namur, Belgium

    Arvind K. Bhakta, Joseph Delhalle & Zineb Mekhalif

  2. Department of Chemistry, Indian Institute of Technology Patna, Bihta, Bihar, 801103, India

    Sunita Kumari & Sahid Hussain

  3. Loyola Centre for Research and Innovation, St. Aloysius College, Light House Hill Road, Mangalore, Karnataka, 575003, India

    Praveen Martis

  4. Electrochemistry Research Group, Department of Chemistry, St. Joseph’s College, Lalbagh Road, Bangalore, Karnataka, 560 027, India

    Ronald J. Mascarenhas

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  1. Arvind K. Bhakta
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Bhakta, A.K., Kumari, S., Hussain, S. et al. Synthesis and characterization of maghemite nanocrystals decorated multi-wall carbon nanotubes for methylene blue dye removal. J Mater Sci 54, 200–216 (2019). https://doi.org/10.1007/s10853-018-2818-y

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