Browsing by Author "Hiçsönmez Ü."
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Item Use of extraction chromatography for thorium purification from Eskisehir—Beylikahir Thorium-REEs ore deposit(2001) Hiçsönmez Ü.; Eral M.The extraction chromatography method was used to separate thorium from acidic leach solution. The separation of thorium was realized on silica gel column coated with tri-octlyphosphine oxide (TOPO). The extraction yield of thorium on this column from nitric acid leach solution is 91.9%. Then thorium was eluted by using 0.5M H2SO4 solution, and elution yield was determined as 96.5%. The chemical analysis of H2SO4 fractions indicated that thorium was concentrated and purified succesfully by this method. As a result, thorium was recovered in dilute leach solution with a yield of 81.0 ± 6.8%. © 2001, Oldenbourg Wissenschaftsverlag GmbH. All rights reserved.Item Use of extraction chromatography for thorium purification from eskişhir-beylikahir thorium-REEs ore deposit(2001) Hiçsönmez Ü.; Eral M.The extraction chromatography method was used to separate thorium from acidic leach solution. The separation of thorium was realized on silica gel column coated with tri-octlyphosphine oxide (TOPO). The extraction yield of thorium on this column from nitric acid leach solution is 91.9%. Then thorium was eluted by using 0.5 M H2SO4 solution, and elution yield was determined as 96.5%. The chemical analysis of H2SO4 fractions indicated that thorium was concentrated and purified succesfully by this method. As a result, thorium was recovered in dilute leach solution with a yield of 81.0±6.8%.Item An assessment of the quality of various bottled mineral water marketed in Turkey(2008) Baba A.; Ereeş F.S.; Hiçsönmez Ü.; Çam S.; Özdilek H.G.Fifteen bottled mineral waters purchased at random all over Turkey were analyzed for their chemical composition by OPTIMA-2000 ICP-AES Perkin Elmer techniques. Results show a wide spread in the chemical specification of these mineral waters, with differences in chemical composition observed in the regions being due to the geological environment and the majority of bottled mineral waters exceeding the pH limit of Turkish drinking water standards. When the concentrations of elements are evaluated, it can readily be seen that generally there are three types of mineral water in Turkey. The concentrations of Al, B, Ba, Cd, Cu, Cr, Fe, Mn Pb and Zn in mineral water were compared with the limits established by the Turkish Standard for Natural Mineral Waters (Turkish Official Gazette 2004); water standards prepared by World Health Organization (2006) and the United States of America Environmental Protection Agency (US EPA) drinking water standards (1993). Such a comparison shows that, except for Ba and Mn, the concentrations of the other heavy metals are lower than the limit of the US.EPA in Turkey. Some parameters examined were found to comprise strong correlations pair-wise. © Springer Science+Business Media B.V. 2007.Item Determination of major and minor elements in the malva sylvestris L. from turkey using ICP-OES techniques(2009) Hiçsönmez Ü.; Ereeş F.S.; Özdemir C.; Özdemir A.; Çam S.In this work, Malva sylvestris var. mauritiana (L.) leaves were collected from different points in Muradiye region of Manisa-Turkey. The leaves were dissolved by wet digestion method using a mixture of mineral acid. Concentrations of Ag, Al, B, Ba, Bi, Ca, Cd, Co, Cr, Cu, Fe, K, La, Mg, Mn, Na, Ni, Pb, Sn, Sr, Sb, Si, Ti, U, Zn, and Zr in prepared solutions were determined by using inductively coupled plasma optical emission spectrometry (ICP-OES). High Ca (13,848 mg/kg) and Mg (1,936 mg/kg) concentrations were found at the leaves. Obtained values were compared with the internationally permitted (standard) values. The results of elements were analyzed statistically (analysis of variance test). For different leaf sizes, concentration factors were calculated. © 2008 Humana Press Inc.Item Removal of cesium from aqueous solution by adsorption onto sivas-yildizeli (Türkiye) vermiculite: Equilibrium, kinetic and thermodynamic studies(Turkish Chemical Society, 2018) Akalin H.A.; Hiçsönmez Ü.; Yilmaz H.In this study, cesium adsorption performance of raw vermiculite obtained from Sivas-Yıldızeli region of Turkey was investigated using batch adsorption method. In order to obtain the optimum adsorption conditions; different adsorbent dosages, contact times, solution pH’s, initial cesium concentrations and temperature ranges were investigated. The concentration of cesium in solution was determined by ICP-OES. Kinetic studies demonstrated that adsorption process was in accordance with pseudo-second order kinetic model and equilibrium isotherm modeling studies showed that the process was compatible with Langmuir, Freundlich and Temkin adsorption isotherm models, indicating that Cs adsorption process had both physical and chemical character. Negative Gibbs energy values obtained from thermodynamic studies revealed that the adsorption process was spontaneous and had a high feasibility. Additionally, the negative enthalpy value indicated that process was exothermic, suggesting that the adsorbed Cs+ ions decreased with increasing reaction temperatures. Positive entropy value showed that disorderliness between solid-liquid phase increased during adsorption. Results clearly indicate that vermiculite mineral has a promising potential in removing Cs+ ions from aqueous media which leads mineral may also be used in decomposing and efficiently removing radioactive cesium from contaminated waters. © 2018, Turkish Chemical Society. All rights reserved.Item Sorption of uranium(VI) from aqueous solutions by DEEA organo-volcanic: isotherms, kinetic and thermodynamic studies(Springer Singapore, 2018) Kaynar Ü.H.; Hiçsönmez Ü.; Çam Kaynar S.; Koçak S.The sorption of the uranium(VI) ions from aqueous solutions by diethylethanolammonium organo-volcanics (Kula-TURKEY) was investigated under different experimental conditions. DEEA was used to modify the surface of basaltic volcanics. The characteristic of basaltic volcanic was analyzed by XRF, SEM–EDS, FTIR, and XRD. The BET surface areas of unmodified volcanics and DEEA-modified volcanics were found as 2.265 and 3.689 m2/g, respectively. The volcanic samples were treated by using different concentrations of DEEA. The adsorption of U(VI) on natural and modified volcanics was examined as a function of the contact time, initial pH of the solution, initial U(VI) concentration, and temperature. Langmuir, Freundlich, and D–R adsorption isotherms were used to describe the adsorption. While examining the adsorption percentage and distribution coefficient, these values for unmodified volcanics were found to be 25% ± 0.76 and 10.08 mL/g, while the values for the DEEA-modified volcanics were 88% ± 1.04 and 220 mL/g, respectively. The pseudo-first-order and pseudo-second-order kinetic models were used to describe the kinetic data. In this study, it can be seen that the adsorption process is suitable for the pseudo-second-order kinetic model. Various thermodynamic parameters (ΔG°, ΔH°, and ΔS°) were calculated with the thermodynamic distribution coefficients obtained at different temperatures. The sorption process was a chemical adsorption process. The results indicated that the processes are spontaneous and endothermic. © 2018, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Chinese Nuclear Society, Science Press China and Springer Nature Singapore Pte Ltd.Item Preliminary Cesium Adsorption Study with a Unique Iron(III) Ferrocyanide/Vermiculite Nanocomposite via One-Pot Hydrothermal Synthesis(Pleiades journals, 2022) Akalın H.A.; Hiçsönmez Ü.Abstract: A novel iron(III) ferrocyanide (Prussian blue)/vermiculite nanocomposite was synthesized, characterized and the cesium removal efficiency of the nanoadsorbent was investigated in this study. Characterization studies revealed that the nanocomposite was successfully produced and the saturation magnetization value was found as 0.15 emu/g. Low magnetization value was due to the low amount of Fe3O4 (magnetite). Adsorption isotherm studies confirmed that the process was in accordance with Langmuir, Freundlich, and D‒R (Dubinin–Radushkevich) isotherm models, suggesting that the reaction mechanism was both monolayer and multilayer, also had a physical sorption character with 0.0906 kJ/mol adsorption energy. Higher linear regression values obtained from Langmuir and D–R isotherms proved that chemical adsorption mechanism was more favorable than physical adsorption and the nanoadsorbent had 49.50 mg/g maximum adsorption capacity. © 2022, Pleiades Publishing, Ltd.Item Adsorption Studies of Radionuclides by Turkish Minerals: A Review(Turkish Chemical Society, 2022) İnan S.; Hiçsönmez Ü.Hazardous radionuclides are produced during normal operation of nuclear power plants and research facilities. They can also be spread to the environment due to fallout from nuclear accidents and nuclear weapon tests. The removal of hazardous radionuclides and the safe management of radioactive waste are of vital necessity. Natural minerals have been widely used for the removal of heavy metals and radionuclides because of their low cost, high capacity, and radiation resistance properties. Turkey has abundant natural mineral deposits. These deposits include clinoptilolite, bentonite, montmorillonite, kaolinite, vermiculite, illite, red clay, sepiolite, diatomite, perlite, and volcanic tuff. Within the scope of this review, Turkish minerals were classified as three main groups: zeolites, clay minerals, and other minerals. The review consists of sections on the general properties of natural minerals such as zeolites and clays, the characteristics of Turkish minerals, and the adsorption performance of these minerals against some radionuclide ions (Sr, Cs, U, Th and Po). © 2022, Turkish Chemical Society. All rights reserved.