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Guar Gum-Grafted Terpolymer Hydrogels for Ligand-Selective Individual and Synergistic Adsorption: Effect of Comonomer Composition
journal contribution
posted on 2018-01-16, 18:53 authored by Nayan Ranjan Singha, Arnab Dutta, Manas Mahapatra, Mrinmoy Karmakar, Himarati Mondal, Pijush Kanti Chattopadhyay, Dilip K. MaitiGrafting
of guar gum (GG) and in situ strategic attachment of acrylamidosodiumpropanoate
(ASP) via solution polymerization of acrylamide (AM) and sodium acrylate
(SA) resulted in the synthesis of a sustainable GG-g-(AM-co-SA-co-ASP)/GGAMSAASP interpenetrating
polymer network (IPN)-based smart superadsorbent with excellent physicochemical
properties and reusability, through systematic optimization by response
surface methodology (RSM) for removal of methyl violet (MV) and/or
Hg(II). The relative effects of SA/AM ratios, in situ allocation of
ASP, grafting of GG into the AMSAASP terpolymer, ligand-selective
superadsorption mechanism, and relative microstructural changes in
individually/synergistically-adsorbed MV–/Hg(II)–/Hg(II)–MV–GGAMSAASPs
were determined by extensive analyses using Fourier transform infrared
(FTIR), proton nuclear magnetic resonance, ultraviolet–visible
(UV–vis), and O 1s-/N 1s-/C 1s-/Hg 4f7/2,5/2-X-ray
photoelectron spectroscopies, thermogravimetric analysis, differential
scanning calorimetry, X-ray diffraction, field emission scanning electron
microscopy, and energy-dispersive spectroscopy and were supported
by % gel content, pHPZC, and % graft ratio. The ionic/covalent-bonding,
monodentate, bidentate bridging, and bidentate chelating coordination
between GGAMSAASPs and Hg(II), and MV+–Hg(II) bonding
were rationalized by FTIR, UV–vis, fitment of kinetics data
to the pseudo-second-order model, and thermodynamic parameters. The
maximum adsorption capacities of 49.12 and 53.28 mg g–1 were determined for Hg(II) and MV, respectively, under optimized
conditions.
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thermogravimetric analysisGuar Gum-Grafted Terpolymer Hydrogelsligand-selective superadsorption mechanismratiokinetics dataadsorption capacitiesGGSynergistic Adsorptionsodium acrylateIPNHgmethyl violetoptimized conditionsX-ray photoelectron spectroscopiesAMSAASP terpolymerbidentate chelating coordinationsolution polymerizationpH PZCComonomer Composition GraftingUVMVfield emission scanning electron microscopyFTIRscanning calorimetryenergy-dispersive spectroscopyO 1response surface methodologymicrostructural changespseudo-second-order modelphysicochemical propertiesGGAMSAASPX-ray diffractionRSM
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