Issue 63, 2016

Thiopropyl-containing ionic liquid based periodic mesoporous organosilica as a novel and efficient adsorbent for the removal of Hg(ii) and Pb(ii) ions from aqueous solutions

Abstract

In the present study, a novel thiol-functionalized ionic liquid based periodic mesoporous organosilica (PMO-IL-SH) is prepared and characterized by diffuse reflectance infrared Fourier transform spectroscopy (DRIFTs), powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and energy dispersive X-ray analysis (EDAX). The PMO-IL-SH nanomaterial was successfully used for the removal of Hg(II) and Pb(II) ions from aqueous solution. A series of batch adsorption experiments was conducted to study the effects of pH, contact time, adsorbent dose, initial dye concentration, and temperature. Isotherm, kinetics and thermodynamics models were used to study the adsorption behavior. Adsorption isotherms of Hg(II) and Pb(II) ions obeyed the Langmuir equation indicating monolayer sorption. Adsorption kinetics based on a pseudo-second-order rate equation showed that the rate limiting step involves a chemical reaction. Based on thermodynamics data, ΔG0, ΔH0 and ΔS0, it was concluded that the adsorption of Hg(II) and Pb(II) ions on the PMO-IL-SH is endothermic, spontaneous and feasible in nature.

Graphical abstract: Thiopropyl-containing ionic liquid based periodic mesoporous organosilica as a novel and efficient adsorbent for the removal of Hg(ii) and Pb(ii) ions from aqueous solutions

Article information

Article type
Paper
Submitted
02 Apr 2016
Accepted
27 May 2016
First published
20 Jun 2016

RSC Adv., 2016,6, 58658-58666

Thiopropyl-containing ionic liquid based periodic mesoporous organosilica as a novel and efficient adsorbent for the removal of Hg(II) and Pb(II) ions from aqueous solutions

D. Elhamifar, F. Shojaeipoor and O. Yari, RSC Adv., 2016, 6, 58658 DOI: 10.1039/C6RA08523G

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