Thermodynamics of adsorption of uranyl ions onto amidoximated poly(acrylonitrile)/poly(N-vinyl 2-pyrrolidone) interpenetrating polymer networks

Pekel, N; Sahiner, N; Guven, O

doi:10.1002/polb.10738

Thermodynamics of adsorption of uranyl ions onto amidoximated poly(acrylonitrile)/poly(N-vinyl 2-pyrrolidone) interpenetrating polymer networks

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Pekel N., Sahiner N., Guven O.

JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS, vol.42, no.6, pp.986-993, 2004 (SCI-Expanded)

Publication Type: Article / Article
Volume: 42 Issue: 6
Publication Date: 2004
Doi Number: 10.1002/polb.10738
Journal Name: JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
Page Numbers: pp.986-993
Hacettepe University Affiliated: No

Abstract

The interaction of uranyl ions (UO22+) with interpenetrating polymer networks (IPNs) based on amidoximated poly(acrylonitrile)/poly(N-vinyI 2-pyrrolidone) was examined. The adsorption capacity of IPN hydrogels as well as the adsorption kinetics and the effect of temperature on UO22+ ion adsorption were investigated. Thermodynamic quantities and kinetic parameters were calculated with adsorption isotherm data. The initial adsorption-rate values for each temperature were calculated, and the corresponding rate constants decreased with increasing temperature. The adsorption enthalpy, entropy, and free energy of the UO22+ ion with., amidoximated IPN hydrogels were calculated from basic thermodynamic relations. It was assessed that adsorption occurred by strong electrostatic interactions with an adsorption enthalpy of -31.5 kJ/mol. (C) 2004 Wiley Periodicals, Inc.