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Open AccessArticle

Adsorption of Sb (III) on Oxidized Exfoliated Graphite Nanoplatelets

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National Research & Development Institute for Chemistry and Petrochemistry ICECHIM, 202 Splaiul Independentei Street, 060021 Bucharest, Romania
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Faculty of Applied Chemistry and Material Science, University Politehnica of Bucharest, 313 Splaiul Independentei Street, 060042 Bucharest, Romania
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“Ilie Murgulescu” Institute of Physical Chemistry of the Romanian Academy, 202 Splaiul Independentei Street, 060021 Bucharest, Romania
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“Horia Hulubei” National Institute for Physics and Nuclear Engineering—IFIN HH, 30 Reactorului Street, P.O. Box MG-6, 077125 Bucharest-Magurele, Romania
*
Authors to whom correspondence should be addressed.
Nanomaterials 2018, 8(12), 992; https://doi.org/10.3390/nano8120992
Received: 31 October 2018 / Revised: 13 November 2018 / Accepted: 27 November 2018 / Published: 30 November 2018
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. View Full-Text
Keywords: Sb(III); adsorption; oxidized exfoliated graphite nanoplatelets Sb(III); adsorption; oxidized exfoliated graphite nanoplatelets
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Capra, L.; Manolache, M.; Ion, I.; Stoica, R.; Stinga, G.; Doncea, S.M.; Alexandrescu, E.; Somoghi, R.; Calin, M.R.; Radulescu, I.; Ivan, G.R.; Deaconu, M.; Ion, A.C. Adsorption of Sb (III) on Oxidized Exfoliated Graphite Nanoplatelets. Nanomaterials 2018, 8, 992.

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