Browsing by Author "Kuzu, S"

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    Sorption profile of uranium (VI) from aqueous medium onto 3-O-acetyl-(S)-1,2-O-trichloroethylidene-5,6,8-trideoxy-α-D-xylo-oct-5(E)-eno-1,4-furano-7-ulose (OASOTCETDOXDXOEEFU)
    Aslani, MAA; Yusan, S; Yenil, N; Kuzu, S
    Adsorption of uranyl ions onto 3-O-asetil-(S)-1,2-O-trikloroetiliden-5,6,8-trideoksi-alpha-D-ksilo-okt-5(E)-eno-1,4-furano-7-uloz (OASOTCETDOXDXOEEFU) from aqueous solutions was investigated in batch adsorption experiments. The study has been conducted to investigate the effects of the pH of solution, contact time, initial concentration and temperature for adsorption process. The maximum removal of U(VI) was found to be about 55% at pH 4.0 and initial U(VI) concentration of 50 mg L-1. The organic adsorbent material was characterized by Fourier-transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The experimental isotherm data of uranium sorption were examined using several adsorption models. Adsorption process fitted to Freundlich and Halsey isotherm models. Thermodynamic results showed that the adsorption process was exothermic and spontaneous. (C) 2012 Elsevier B.V. All rights reserved.
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    Properties of Uranium(VI) Adsorption by Methyl 3-O-Acetyl-5, 6-dideoxy-(S)-1,2-trichloroethylidene-α-D-xylo-hept-5(E)-eno-1, 4-furano-uronate
    Yusan, S; Yenil, N; Kuzu, S; Aslani, MAA
    In this study the effect of adsorption parameters such as pH, concentration of uranium(VI), shaking time, and temperature on methyl 3-O-acetyl-5,6-dideoxy-(S)-1,2-trichloroethylidene-alpha-D-xylo-hept-5(E)-eno-1,4-furano-uronate (MOADDTCEXHEFU) for U(VI) ions have been investigated. The adsorption data for uranium(VI) were well-fitted by the Langmuir isotherm. Thermodynamic analysis showed that the value of Delta G degrees is negative and Delta H degrees and Delta S degrees are positive. These results and a Fourier transform infrared (FTIR) spectrum analysis show that uranium (VI) ions were successfully bonded to this molecule. The affinity of MOADDTCEXHEFU to Th(4+), Ba(2+), and also Mg(2+) is about 10 times higher than uranium(VI).