✍ Scribed by Hülya Güler; Nurettin Şahiner; Gül Asiye Ayçik; Olgun Güven
No coin nor oath required. For personal study only.
A new polymeric adsorbent bearing both hydrophilic groups providing swelling in water and amidoxime groups for chelating with uranyl ions (UO 2/ 2 ), 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 Ç 60%. Kinetics of the conversion reaction of the cyano (CN) group to the amidoxime (HONCNH 2 ) group has been studied by reacting with hydroxylamine (NH 2 OH) solution at a molar ratio of NH 2 OH/CN Å 1.25 in aqueous media at three different temperatures, 30, 40, and 50ЊC, for 3-4 days. The degree of amidoximation ratio was determined by UO 2/ 2 ion adsorption and FTIR spectrometry and the UO 2/ 2 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.
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Ni 2+ was removed quantitatively from aqueous flows by columns loaded with polycrystalline hydrogen uranyl phosphate (HUP) bound to immobilized cells of Citrobacter sp. The columns functioned effectively in Ni uptake/regeneration cycles; five cycles were completed without significant decrease in the