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      Synthesis of Poly(methacrylic acid)/Montmorillonite Hydrogel Nanocomposite for Efficient Adsorption of Amoxicillin and Diclofenac from Aqueous Environment: Kinetic, Isotherm, Reusability, and Thermodynamic Investigations

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      American Chemical Society

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          Abstract

          Herein, a simplistic redox polymerization strategy was utilized for the fabrication of a poly(methacrylic acid)/montmorillonite hydrogel nanocomposite (PMA/nMMT) and probed as a sorbent for sequestration of two pharmaceutical contaminants, viz., amoxicillin (AMX) and diclofenac (DF), from wastewater. The synthesized hydrogel nanocomposite was characterized by the Fourier transform infrared, X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy–energy dispersive X-ray spectroscopy, and transmission electron microscopy techniques to analyze structural characteristics and sorption interactions. The efficacy of PMA/nMMT was thoroughly investigated for the sequestration of AMX and DF from the aquatic phase with a variation in operative variables like agitation time, sorbent dosage, pH, and initial sorbate concentration. The reaction kinetics was essentially consistent with the pseudo-second-order model with rate dominated by the intraparticle diffusion model as well as the film diffusion mechanism. The Freundlich isotherm appropriated the equilibrium data over the entire range of concentration. Thermodynamic investigation explored the spontaneous and endothermic nature of the process. The most possible mechanism has been explained, which includes electrostatic interaction, hydrogen bonding, cationic exchange, and partition mechanism. Economic feasibility, better sorption capacity (152.65 for AMX and 152.86 mg/g for DF), and efficient regeneration and reusability even after four consecutive sorption–desorption cycles ascertained PMA/nMMT as a potential sorbent for AMX and DF uptake from the aqueous phase.

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          Most cited references66

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          Pharmaceuticals of Emerging Concern in Aquatic Systems: Chemistry, Occurrence, Effects, and Removal Methods

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            Oberflächeneinflüsse beim Bler und bei der Bierbereitung: Emslander, Fritz, und Freundlich, Herbert, (Zeitschr. f. phys. Chem. 49, 317, 1904)

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              The Exchange Adsorption of Ions from Aqueous Solutions by Organic Zeolites. II. Kinetics1

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                Author and article information

                Journal
                ACS Omega
                ACS Omega
                ao
                acsodf
                ACS Omega
                American Chemical Society
                2470-1343
                05 February 2020
                18 February 2020
                : 5
                : 6
                : 2843-2855
                Affiliations
                [1]Department of Chemistry, Jamia Millia Islamia , Jamia Nagar, New Delhi 110 025, India
                Author notes
                [* ]E-mail: takhan@ 123456jmi.ac.in , takhan501@ 123456yahoo.com . Tel. +91 11 26985938.
                Article
                10.1021/acsomega.9b03617
                7033978
                e896eb51-c8fb-4f5e-9e53-30a8ed3700ea
                Copyright © 2020 American Chemical Society

                This is an open access article published under an ACS AuthorChoice License, which permits copying and redistribution of the article or any adaptations for non-commercial purposes.

                History
                : 28 October 2019
                : 23 January 2020
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                ao9b03617

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