Adsorption of Ni2+ from aqueous solution by magnetic Fe@graphite nanocomposite

作者：Konicki Wojciech; Pelka Rafal; Arabczyk Walerian

来源：Polish Journal of Chemical Technology, 2016, 18(4): 96-103.

DOI：10.1515/pjct-2016-0077

<jats:title>Abstract</jats:title>
<jats:p>The removal of Ni<jats:sup>2+</jats:sup> from aqueous solution by iron nanoparticles encapsulated by graphitic layers (Fe@G) was investigated. Nanoparticles Fe@G were prepared by chemical vapor deposition CVD process using methane as a carbon source and nanocrystalline iron. The properties of Fe@G were characterized by X-ray Diffraction method (XRD), High-Resolution Transmission Electron Microscopy (HRTEM), Fourier Transform-Infrared Spectroscopy (FTIR), BET surface area and zeta potential measurements. The effects of initial Ni<jats:sup>2+</jats:sup> concentration (1–20 mg L<jats:sup>−1</jats:sup>), pH (4–11) and temperature (20–60°C) on adsorption capacity were studied. The adsorption capacity at equilibrium increased from 2.96 to 8.78 mg g<jats:sup>−1</jats:sup>, with the increase in the initial concentration of Ni<jats:sup>2+</jats:sup> from 1 to 20 mg L<jats:sup>−1</jats:sup> at pH 7.0 and 20oC. The experimental results indicated that the maximum Ni<jats:sup>2+</jats:sup> removal could be attained at a solution pH of 8.2 and the adsorption capacity obtained was 9.33 mg g<jats:sup>−1</jats:sup>. The experimental data fitted well with the Langmuir model with a monolayer adsorption capacity of 9.20 mg g<jats:sup>−1</jats:sup>. The adsorption kinetics was found to follow pseudo-second-order kinetic model. Thermodynamics parameters, ΔHO, ΔGO and ΔSO, were calculated, indicating that the adsorption of Ni<jats:sup>2+</jats:sup> onto Fe@G was spontaneous and endothermic in nature.</jats:p>

• 出版日期2016-12