Development of novel adsorbent materials for recovery and enrichment of uranium from aqueous media

Abstract

A new polymeric adsorbent bearing both hydrophilic groups providing swelling in water and amidoxime groups for chelating with uranyl ions (UO22+), has been developed and its adsorptive ability for recovering uranium from aqueous media has been investigated. The polymers obtained by irradiating the solution of polyethylene glycol (PEG) in acrylonitrile (AN) are defined as interpenetrating polymer networks (IPNs) and the adsorbent has been obtained by applying the amidoximation reaction to the IPNs with a conversion ratio of approximately 60%. Kinetics of the conversion reaction of the cyano (CN) group to the amidoxime (HONCNH2) group has been studied by reacting with hydroxylamine (NH2OH) solution at a molar ratio of NH2OH/CN = 1.25 in aqueous media at three different temperatures, 30, 40, and 50 °C, for 3-4 days. The degree of amidoximation ratio was determined by UO22+ ion adsorption and FTIR spectrometry and the UO22+ ion adsorption values were found by both UV and gamma spectrometry and also by gravimetry. It was found that the polymeric adsorbent has a very high adsorption ability for uranium and quite a good stability in aqueous media.