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Issue 42, 2018
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Silica based inorganic–organic hybrid materials for the adsorptive removal of chromium

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Abstract

We employed polymer functionalized silica gel as an adsorbent for the removal of Cr(VI) from water. The chains of 2-aminoethyl methacrylate hydrochloride (AEMA·HCl) polymer were grown from the surface of silica gel via surface-initiated conventional radical polymerization and the resulting hybrid material exhibited high affinity for chromium(VI). To investigate the adsorption behavior of Cr(VI) on diverse polymer based hybrid materials, the removal capacity of (SG-AEMH) was compared with our previously reported branched polyamine functionalized mesoporous silica (MS-PEI). The adsorption capacities of polymer based materials were also compared with their respective monolayer based platforms comprising a 3-aminopropyltriethoxysilane (APTES) functionalized silica gel (SG-APTES) and mesoporous silica (MS-APTES). The polymer based systems showed excellent Cr(VI) adsorption efficiencies compared to monolayer counterparts. The structural characteristics and surface modification of these adsorbents were examined by Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and thermogravimetric analysis (TGA). The experimental data were analyzed using the Langmuir and Freundlich models. Correlation coefficients were determined by analyzing each isotherm. The kinetic data of adsorption reactions were described by pseudo-first-order and pseudo-second-order equations. Thermodynamic parameters, i.e., change in the free energy (ΔG°), the enthalpy (ΔH°), and the entropy (ΔS°), were also evaluated. The synthesized hybrid materials exhibited a high adsorption capacity for chromium ions. Furthermore, they could be regenerated and recycled effectively.

Graphical abstract: Silica based inorganic–organic hybrid materials for the adsorptive removal of chromium

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Article information


Submitted
17 May 2018
Accepted
21 Jun 2018
First published
02 Jul 2018

This article is Open Access

RSC Adv., 2018,8, 23963-23972
Article type
Paper

Silica based inorganic–organic hybrid materials for the adsorptive removal of chromium

S. Nayab, H. Baig, A. Ghaffar, E. Tuncel, Z. Oluz, H. Duran and B. Yameen, RSC Adv., 2018, 8, 23963
DOI: 10.1039/C8RA04209H

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