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Issue 6, 2018
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Fabrication of magnetic particles reinforced nano-hydroxyapatite/gelatin composite for selective Cr(vi) removal from water

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Abstract

The presence of chromium ion in drinking water has been proven to be toxic and carcinogenic. Hence, an attempt has been made to synthesize magnetic Fe3O4 fabricated with nano-hydroxyapatite (n-HAp)/gelatin (Gel) biocomposite by both in situ precipitation (in situ) and hydrothermal (hydro) methods. The hydrothermal-assisted Fe3O4@n-HApGel biocomposite achieved enhanced sorption capacity (SC) compare to the in situ precipitation method. The physico-chemical properties of the as-synthesized adsorbents were thoroughly characterized using various advanced instrumental techniques, namely, FTIR, XRD, SEM, EDAX, TEM and BET surface area analysis. Chromium adsorption mechanism of hydrothermal-assisted Fe3O4@n-HApGel composite was described by electrostatic attraction with surface complexation and reduction. The chromium adsorption behaviour of hydrothermal-assisted Fe3O4@n-HApGel biocomposite was interpreted using Langmuir, Freundlich and Dubinin–Radushkevich (D–R) isotherms. The thermodynamic experimental data of Fe3O4@n-HApGel biocomposite indicates that the chromium sorption process is endothermic and spontaneous in nature. Fe3O4@n-HApGel composite can be easily recycled for more than 5 cycles using NaOH eluent. In addition, the magnetic biocomposite is also suitable for treating chromium polluted ground water.

Graphical abstract: Fabrication of magnetic particles reinforced nano-hydroxyapatite/gelatin composite for selective Cr(vi) removal from water

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Article information


Submitted
18 Jan 2018
Accepted
27 Mar 2018
First published
28 Mar 2018

Environ. Sci.: Water Res. Technol., 2018,4, 783-794
Article type
Paper

Fabrication of magnetic particles reinforced nano-hydroxyapatite/gelatin composite for selective Cr(VI) removal from water

V. Gopalakannan, S. Periyasamy and N. Viswanathan, Environ. Sci.: Water Res. Technol., 2018, 4, 783
DOI: 10.1039/C8EW00027A

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