Modification of nano-clays with ionic liquids for the removal of Cd (II) ion from aqueous phase

Naderi, A., Delavar, M.A., Ghorbani, Y. , Kaboudin, B. and Hosseini, M. (2018) Modification of nano-clays with ionic liquids for the removal of Cd (II) ion from aqueous phase. Applied Clay Science, 158 . pp. 236-245. ISSN 0169-1317

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The present study attempts to synthesize nano-modified clays of Na-bentonite (Bent) and montmorillonite (MT), using three imidazolium-based ionic liquids (ILs) including 3,3′-(hexyl)bis(3-methylimidazolium) bromide chloride ([H(mim)2[Br][Cl]), 1-hexyl-3-methylimidazolium chloride ([Hmim][Cl]) and 1-octyl-3-methylimidazolium chloride ([Omim][Cl]). X-ray diffraction (XRD), Fourier transformed infrared spectroscopy (FT-IR), carbon, hydrogen and nitrogen elemental analysis (CHN), scanning electron microscope (SEM) and specific surface area (SSA) (using N2-BET) techniques provided evidence of successful modification of the guest clays. Removal of Cd (II) from aqueous phase was investigated using the modified clays under different experimental conditions of reaction time, pH and adsorbent dosage. Detailed isotherms and kinetic studies showed that the modified clays have much higher Cd (II) adsorption capacity compared to those of the starting clay minerals. The maximum Cd (II) absorption capacities of 87.46 and 94.6 mg g−1 were observed in [H(mim)2]-MT and [H(mim)2]-Bent with d-values of 35.4 Å and 28.3 Å respectively. The [Omim]-clays had the highest adsorption affinities of Cd (II) in initial concentrations of Cd (II). This study shows that ILs could enhance the clay capacity and tendency for Cd (II) absorption with different trends based on the ILs structures. The modified clays using ILs are green and eco-friendly adsorbents and due to substantial increase in their capacity for the removal of heavy metals, they could have positive economic and environmental impacts.

Keywords:Absorption, Adsorbents, Bentonite, Chlorine compounds, Clay minerals, Environmental impact, Heavy metals, Infrared spectroscopy, Ionic liquids, Organoclay, Scanning electron microscopy, Clay modification, Experimental conditions, Fourier transformed infrared spectroscopy, Imidazolium-based ionic liquid, Initial concentration, Nitrogen elemental analysis, aqueous solution, cadmium, ion, ionic liquid, montmorillonite, reaction kinetics, 1-Hexyl-3- methylimidazolium chlorides, Cadmium compounds
Subjects:F Physical Sciences > F100 Chemistry
Divisions:College of Science
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ID Code:54539
Deposited On:06 Jul 2023 09:05

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