Abstract
The interaction of uranyl ions (UOurn:x-wiley:08876266:media:POLB10738:tex2gif-stack-1) with interpenetrating polymer networks (IPNs) based on amidoximated poly(acrylonitrile)/poly(N-vinyl 2-pyrrolidone) was examined. The adsorption capacity of IPN hydrogels as well as the adsorption kinetics and the effect of temperature on UOurn:x-wiley:08876266:media:POLB10738:tex2gif-stack-2 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 UOurn:x-wiley:08876266:media:POLB10738:tex2gif-stack-3 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.