Sabriye Yusan

Bio: Sabriye Yusan is an academic researcher from Ege University. The author has contributed to research in topics: Adsorption & Sorption. The author has an hindex of 13, co-authored 31 publications receiving 640 citations. Previous affiliations of Sabriye Yusan include Universiti Teknologi Malaysia.

Magnesium oxide nanoparticles: Preparation, characterization, and uranium sorption properties

Abstract: The objective of this work was to study the sorption of uranium (VI) ions on magnesium oxide (MgO) from aqueous solutions. The MgO has been prepared via hydroxide precipitation followed by thermal decomposition of the hydroxide. MgO was characterized by X-ray powder diffraction, scanning electron microscope, and multipoint Brunauer, Emmett, and Teller. The relative importance of test parameters such concentration of adsorbate, pH, contact time, and temperature on adsorption performance of MgO for U(VI) ion were studied and the optimum sorption efficiency was found as 87.61 ± 3.10%. Desorption tests were also carried out and desorption efficiency was found as 100% with NH4Cl and NaNO3 solutions containing 0.1 M on a single step. Typical sorption isotherms (Freundlich and Dubinin-Raduskevich) were determined for the mechanism of sorption process and thermodynamic constants (ΔH°, ΔS°, and ΔG°) were calculated as −8.738 kJ mol−1, −21.68 kJ mol−1, and 0.102 kJ mol−1 K−1, respectively. © 2011 American Institute of Chemical Engineers Environ Prog, 2011

Adsorption Characterization of Strontium on PAN/Zeolite Composite Adsorbent

Abstract: This work reports the adsorption of strontium from aqueous solutions onto PAN/zeolite composite. The strontium adsorption on the composite adsorbent was studied as a function of initial strontium concentration, pH of the solution, contact time and temperature. Adsorption isotherms like Langmuir, Freundlich,Dubinin–Radushkevich (D–R) and Temkin were used to analyze the equilibrium data at the different concentrations.Adsorption process well fitted to Temkin isotherm model. Thermodynamic parameters such as the changes in enthalpy, entropy and Gibbs’ free energy were determined, showing adsorption to be an exothermic and spontaneous process.

Methods Of Enzymatic Analysis

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Preconcentration of U(VI) ions on few-layered graphene oxide nanosheets from aqueous solutions

Abstract: Graphene oxide nanosheets have attracted multidisciplinary attention due to their unique physicochemical properties. Herein, few-layered graphene oxide nanosheets were synthesized from graphite using a modified Hummers method and were characterized by TEM, AFM, Raman spectroscopy, XPS, FTIR spectroscopy, TG–DTA and acid–base titrations. The prepared few-layered graphene oxide nanosheets were used as adsorbents for the preconcentration of U(VI) ions from large volumes of aqueous solutions as a function of pH, ionic strength and temperature. The sorption of U(VI) ions on the graphene oxide nanosheets was strongly dependent on pH and independent of the ionic strength, indicating that the sorption was mainly dominated by inner-sphere surface complexation rather than by outer-sphere surface complexation or ion exchange. The abundant oxygen-containing functional groups on the surfaces of the graphene oxide nanosheets played an important role in U(VI) sorption. The sorption of U(VI) on graphene oxide nanosheets increased with an increase in temperature and the thermodynamic parameters calculated from the temperature-dependent sorption isotherms suggested that the sorption of U(VI) on graphene oxide nanosheets was an endothermic and spontaneous process. The maximum sorption capacities (Qmax) of U(VI) at pH 5.0 ± 0.1 and T = 20 °C was 97.5 mg g−1, which was much higher than any of the currently reported nanomaterials. The graphene oxide nanosheets may be suitable materials for the removal and preconcentration of U(VI) ions from large volumes of aqueous solutions, for example, U(VI) polluted wastewater, if they can be synthesized in a cost-effective manner on a large scale in the future.

MgO nanoparticles as antibacterial agent: preparation and activity

Abstract: Bacterial pollution is a great risk for human health Nanotechnology offers a way to develop new inorganic antibacterial agents Nano-inorganic metal oxide has a potential to reduce bacterial contamination MgO is an important inorganic oxide and has been widely used in many fields Many studies have shown that MgO nanoparticles have good antibacterial activity Therefore, in this paper, the main synthesis methods, antibacterial activity and antibacterial mechanisms of MgO nanoparticles are reviewed

19. Al-Degs Y., MAM Khraisheh, Tutunji, M.F, Sorption of lead ions on diatomite and manganese-oxides modified diatomite.

Abstract: Naturally occurring diatomaceous earth (diatomite) has been tested as a potential sorbent for Pb(II) ions. The intrinsic exchange properties were further improved by modification with manganese oxides. Modified adsorbent (referred to as Mn-diatomite) showed a higher tendency for adsorbing lead ions from solution at pH 4. The high performance exhibited by Mn-diatomite was attributed to increased surface area and higher negative surface charge after modification. Scanning electron microscope pictures revealed a birnessite structure of manganese oxides, which was featured by a plate-like-crystal structure. Diatomite filtration quality was improved after modification by manganese oxides. Good filtration qualities combined with high exchange capacity emphasised the potential use of Mn-diatomite in filtration systems.