L-methionine montmorillonite encapsulated guar gum-g-polyacrylonitrile copolymer hybrid nanocomposite for removal of heavy metals

Ahmad, R. and Hasan, I. (2017) L-methionine montmorillonite encapsulated guar gum-g-polyacrylonitrile copolymer hybrid nanocomposite for removal of heavy metals. Groundwater for Sustainable Development, 5. pp. 75-84. ISSN 2352801X

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Abstract

L-methionine MMT encapsulated guar gum-g-polyacrylonitrile (GPCM) hybrid nanocomposite was synthesized by free radical graft copolymerization of acrylonitrile monomer with guar gum biopolymer and L-methionine functionalized montmorillonite (MMT). Various analytical techniques such as FT-IR, XRD, SEM, TEM and TGA-DTG were employed for the characterization of nanocomposite material. The effect of various adsorption parameters was studied and optimized by batch experimental design. The optimum pH for removal of Pb (II) and Cu (II) was observed at pH 5 with an equilibrium time of 150 min. The equilibrium data was applied to various isotherm models and results obtained suggested that adsorption was best followed by Langmuir model with maximum monolayer adsorption capacity of 125.00 mg g−1 for Pb (II) and 90.91 mg g−1 for Cu (II). The Kinetic data obtained suggested that the adsorption was best fitted to pseudo second order rate equation with an equilibrium adsorption capacity of 32.52 mg g−1 suggesting that the adsorption was taking place via chemical adsorption mechanism. The thermodynamic parameters obtained, reveals that the adsorption of metal ions on GPCM is spontaneous, endothermic and found to be more feasible at higher temperature. Regeneration studies suggest that GPCM can be used as a potential adsorbent for the removal of heavy metal ions up to four cycle.

Item Type: Article
Uncontrolled Keywords: Amino acid; Endothermic; Guar gum; Heavy metals; Nano clay
Subjects: T Technology > T Technology (General)
Divisions: Faculties > Faculty of Engineering and Technology > Zakir Husain College of Engineering & Technology > Department of Applied Chemistry
Depositing User: AMU Library
Date Deposited: 07 Feb 2018 04:17
Last Modified: 07 Feb 2018 04:53
URI: http://ir.amu.ac.in/id/eprint/11153

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