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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
    (Pergamon-Elsevier Science Ltd, 2023) Kaynar, Umit H.; Kaptanoglu, I. . Gozde; Cam-Kaynar, Sermin; Ugurlu, Onur; Yusan, Sabriye; Aytas, Sule; Madkhli, A. Y.
    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.
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    Adsorption of Uranium(VI) ions by nano Cu-doped ZrO₂: A response surface methodology approach
    (Elsevier Ltd, 2025) Kaptanoglu, Ikbal Gozde; Kaynar, Umit H.; Yusan, Sabriye
    The increasing concerns over environmental sustainability and the preservation of biodiversity highlight the urgent need for effective management of water resources, which are vital for human well-being. Uranium, which is used as an energy source in nuclear power plants, poses significant environmental hazards due to its biological toxicity and the radioactive waste generated from mining and milling processes. This study focuses on the development of a novel copper (Cu) doped nano zirconia (Cu-ZrO2) adsorbent synthesized via the ignition method for the efficient removal of uranium(VI) from contaminated water. The adsorbent was characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) analysis, X-ray photoelectron spectroscopy (XPS), and energy-dispersive X-ray spectroscopy (EDX) techniques. The adsorption process was further optimized using Response Surface Methodology (RSM) to evaluate key parameters including pH (3–8), temperature (20–60 °C), uranium (VI) concentration (25–125 mg/L), and adsorbent dosage (0.0025–0.04 g). A central composite design (CCD) indicated a second-order model with R2 and adjusted R2 values of 0.9823 and 0.9344, respectively. The adsorption studies demonstrated a maximum uranium(VI) adsorption capacity of 246.21 mg/g for Cu-ZrO₂, which is significantly higher than that of pure ZrO₂ (24.12 mg/g). Thermodynamic analyses revealed that the adsorption process is endothermic, with an increase in adsorption capacity at elevated temperatures. The adsorption mechanism was best described by the Freundlich isotherm, indicating a heterogeneous surface and multilayer adsorption. This research contributes to advancing uranium removal technology from water sources, providing an environmentally friendly and cost-effective solution to mitigate the risks associated with uranium contamination. © 2025
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    Preparation of new alginate capsules enclosing diatomite and organic extractants to uptake lanthanum
    (Elsevier, 2023) Colakoglu, Tunc; Oral, Alparslan Enes; Aytas, Sule; Yusan, Sabriye; Kaptanoglu, Ikbal Gozde; Gok, Cem; Yoho, Michael Duncan
    The present study conducted syntheses of Ca-alginate composite beads, which involved trioctyl-amine (TOA), tributyl phosphate (TBP), trioctylphosphine oxide (TOPO) organic extractants, and diatomite for separation of La (III) ions from dilute aqueous solutions. The surface morphology of the capsules was examined under Scanning Electron Microscopy, while their chemical structure was characterized using Fourier Transform Infrared Spectroscopy. Alginate composites were prepared by adding concentrations of TBP (1%-10%), TOPO (0.005 M-0.09 M) and TOA (1%-10%) organic extractants to the Na-alginate-diatomite mixture.The effects of various parameters on adsorption such as solution pH, contact time, metal ion concentration, and temperature, were individually tested using standard solutions of La(III). The maximum uptake capacity of the alginate composite adsorbent, consisting of TOA, diatomite, and alginate for La(III) ions, was examined at 25 degrees C. Adsorption data were analyzed using Langmuir, Freundlich, Dubinin-Radushkevich (D-R), Temkin, FloryHuggins and Brunauer, and Emmett and Teller (BET) isotherm models. The biosorption isotherm parameters were estimated by both linear and nonlinear regression analyses. The results indicate that the Langmuir model provides a better fit than the other models for the adsorption equilibrium data.Thermodynamic parameters such as variations of enthalpy, entropy, and Gibbs free energy were calculated. The maximum uptake capacity of the alginate composite adsorbent, including TOA, diatomite, and alginate for La(III) ions from aqueous solutions was found to be 146.4 mg/g. The adsorption efficiency in dilute solutions was determined to be 97.2%.