Browsing by Author "Yusan, 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).
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    Adsorption of thorium (IV) ions using a novel borate-based nano material Ca3Y2B4O12: Application of response surface methodology and Artificial Neural Network
    Kaynar, UH; Kaptanoglu, IG; Cam-Kaynar, S; Ugurlu, O; Yusan, S; Aytas, S; Madkhli, AY; Can, N
    Since nuclear wastes are the most important wastes in terms of health and the environment, they are evaluated differently within nuclear reactors as well as in terms of their use in medical and industrial applications. In some cases, emergency intervention is necessary due to the amount of radioactivity or the physical and/or chemical conditions. . The purpose of this study is to investigate the adsorption properties of nano Ca3Y2B4O12 (CYBO) material synthesized by the sol-gel combustion method for the adsorption of Thorium (IV) from an aqueous medium. We tested how pH (3???8), the concentration of Th (IV) (25???125 mg/L), amount of adsorbent value (0.005???0.08 g) and temperature (20???60 ???C), affect adsorption efficiency. The best possible combinations of these parameters were examined by Response Surface Methodology (RSM) and Artificial Neural Network (ANN). R2 values for RSM and ANN were 0.9964 and 0.9666, respectively. According to the models, the adsorption capacity under the optimum conditions determined for the RSM and ANN model was found to be 134.62 mg/g and 125.12 mg/g, respectively.