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Magnetite particles covered by amino-functionalized poly(dimethylsiloxane) network for copper(II) adsorption from aqueous solution

  • Original Paper: Sol-gel and hybrid materials with surface modification for applications
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Abstract

An amino-functionalized poly(dimethylsiloxane) (PDMS) were obtained over magnetite particles. The materials obtained were characterized by Fourier transform infrared spectroscopy (ATR-FTIR), X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), and thermogravimetric analysis (TGA). ATR-FTIR spectra showed adsorption bands attributed to the amino-functionalized polymeric network and the Fe–O bonds of magnetite, while XRD patterns indicated that magnetite was covered with an amorphous material, the PDMS polymeric network. Thermal analysis showed that the obtained materials were thermally stable up to 300 °C. SEM micrographs revealed that the polymer network coated the magnetite particles, since the surface roughness decrease. Adsorption of Cu(II) was conducted in aqueous medium at different pH values, contact times, and metal ion concentrations. The adsorption capacities obtained were of 0.56, 0.44, and 0.41 mmol L−1 for the materials with a decreasing content of amino group, respectively. Nonlinear kinetic model equations were applied, showing that the materials with lower and higher content of APTMS was described by chemisorption model, while that the intermediary content by a pseudo-second-order fit. The experimental data of adsorption isotherm were studied by various models and Sips model exhibited the best fit for all materials.

Highlights

  • Magnetite grains were covered by an elastomeric network functionalized with amino groups.

  • Simple preparation of the adsorbent.

  • Adsorption equilibrium are reached after 36 h immersion in aqueous solution.

  • Magnetic separation of the solution after adsorption.

  • Promising adsorption capacities for copper ions in aqueous media.

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Acknowledgements

The authors are indebted to CAPES for the master’s degree fellowship granted to MRB, as well as to CNPq for financial support. We also thank the CME-UFRGS for use of the scanning electron microscopy facilities and Leliz T. Arenas for the SEM images.

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  1. Instituto de Química, Universidade Federal de Alfenas (UNIFAL-MG), Alfenas, MG, 37130-001, Brazil

    Mariana de Rezende Bonesio & Fábio Luiz Pissetti

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de Rezende Bonesio, M., Pissetti, F.L. Magnetite particles covered by amino-functionalized poly(dimethylsiloxane) network for copper(II) adsorption from aqueous solution. J Sol-Gel Sci Technol 94, 154–164 (2020). https://doi.org/10.1007/s10971-019-05154-5

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