Nanomaterials (Nov 2018)

Adsorption of Sb (III) on Oxidized Exfoliated Graphite Nanoplatelets

  • Luiza Capra,
  • Mihaela Manolache,
  • Ion Ion,
  • Rusandica Stoica,
  • Gabriela Stinga,
  • Sanda Maria Doncea,
  • Elvira Alexandrescu,
  • Raluca Somoghi,
  • Marian Romeo Calin,
  • Ileana Radulescu,
  • Georgeta Ramona Ivan,
  • Marian Deaconu,
  • Alina Catrinel Ion

DOI
https://doi.org/10.3390/nano8120992
Journal volume & issue
Vol. 8, no. 12
p. 992

Abstract

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In this work, Sb (III) adsorption on oxidized exfoliated graphite nanoplatelets (ox-xGnP) was evaluated for the first time, to the best of our knowledge. The ox-xGnP were characterized by thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FT-IR), Brunauer⁻Emmet⁻Teller (BET) analysis, scanning electron microscopy (SEM), transmission electron microscopy (TEM) equipped with energy-dispersive X-ray spectroscopy (EDX), and Zeta potential analysis. The adsorption parameters, such as pH and contact time, were optimized, and the best adsorption capacity obtained was 8.91 mg g−1 at pH = 7.0, 1.0 mg ox-xGnP/100 mL solution, T = 293 K, 1.0 mg L−1, Sb (III), 25 min contact time. The best correlation of the kinetic data was described by a pseudo-first-order kinetic model, with R2 = 0.999. The adsorption isotherms of Sb (III) onto ox-xGnP were best described by the Langmuir isotherm model. The thermodynamic parameters showed that the adsorption process was exothermic and spontaneous.

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