Application of the method of phase portraits to the analysis of the kinetics of redistribution of metal ion concentrations in the polyelectrolyte hydrogel-multicomponent solution system

Abstract : The kinetics of redistribution of metal ion concentrations in a system based on a polyelectrolyte hydrogel and a multicomponent salt solution (CuSO 4 and Na 2SO 4) were experimentally examined and theoretically treated. Independently of the mixture composition, the hydrogel swelling-contraction behavior and the sorption-desorption of metal ions are determined by the reactivity of metal ions: the hydrogel sorbs copper ions from solution and collapses; as a result, sodium ions (counterions) are released into the solution. The presence of sodium ions in the mixture decreases the amount of absorbed copper ions and slows down their sorption rate. The method of phase portraits made it possible to obtain a phenomenological equation describing the kinetics of redistribution of metal ion concentrations in the hydrogel-solution system at each hydrogel swelling step (disappearance of dry phase, swelling, and collapse). Experimental data were treated using the frequency filtration technique, which is based on the numerical simulation of a low-pass filter used in radio engineering. With increasing filtration period, the difference between various hydrogel swelling steps is shown to vanish. Comparison of the phase portraits of various mixtures shows that an increase in the amount of any component in the mixture decreases the differences between swelling steps and, thus, substantially simplifies the theoretical description of the process kinetics.
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Soumis le : jeudi 23 février 2012 - 17:26:43
Dernière modification le : lundi 12 novembre 2018 - 11:04:02

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  • HAL Id : hal-00673546, version 1

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I. E. Suleimenov, Tatiana Budtova, S. A. Adil'Bekov, I.Yu. Pereladov, E. A. Bekturov. Application of the method of phase portraits to the analysis of the kinetics of redistribution of metal ion concentrations in the polyelectrolyte hydrogel-multicomponent solution system. Polymer Science Series A / Vysokomolekulyarnye Soedineniya, Ser. A., MAIK Nauka/Interperiodica, 2004, 46 (8), pp.Pages 797-805. ⟨hal-00673546⟩

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