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Reference type: Journal
Authors: Wang JJ, Ding L, Wei J, Liu F
Article Title: Adsorption of copper ions by ion-imprinted simultaneous interpenetrating network hydrogel: Thermodynamics, morphology and mechanism.
Publication date: 2014
Journal: Applied Surface Science
Volume: 305
Page numbers: 412-418.
DOI: 10.1016/j.apsusc.2014.03.102
Alternative URL: http://www.sciencedirect.com/science/article/pii/S0169433214006448

Abstract: Cu(II) ion-imprinted hydrogel [Cu(II)-IIH] with interpenetrating polymer network (IPN) structure was prepared and its application to adsorb Cu(II) ions from aqueous solution was studied. The Cu(II)-IIH was prepared by UV-initiated simultaneous free radical/cationic hybrid polymerization. The adsorption capacity of the Cu(II)-IIH increased with the initial pH value of the solution, but decreased as the temperature rose from 303 to 323 K. Thermodynamic parameters such as the Gibbs free energy (Δ G°), enthalpy (Δ H°) and entropy (Δ S°) for the Cu(II) ions adsorption were evaluated. It was suggested that the adsorption was a spontaneous, exothermic process with further decrease in the degree of freedom at the solid-solution interface due to the negative Δ S° value. The morphology study indicated that the copper adsorption caused significant changes to the hydrogel structure. Finally the adsorption mechanism was studied by Fourier transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS). The results indicated that copper adsorption was mainly through interactions with the amide and ether groups
Template and target information: copper ion, Cu(II)
Author keywords: Ion-imprinted hydrogel, interpenetrating polymer network (IPN), metal ion adsorption, thermodynamics, mechanism


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