Yazar "Pekgozlu, Ilhan" seçeneğine göre listele

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    Luminescence Properties of Al4B2O9:M (M = Dy3+, Sm3+, and Tb3+)
    (Springer, 2024) Pekgozlu, Ilhan
    The objective of this study was to investigate the photoluminescence properties of Al4B2O9:M (M = Dy3+, Sm3+, and Tb3+). The solution combustion method was employed to prepare Al4B2O9 doped with M ions. The synthesized aluminum borates were subjected to phase analysis using X-ray diffraction, while their photoluminescence properties were evaluated using a spectrofluorometer. Under excitation at 352 nm, Al4B2O9:Dy3+ exhibited emission peaks at 484, 578, and 701 nm. Similarly, when excited at 402 nm, Al4B2O9:Sm3+ emitted light at 563, 599, 645, and 702 nm. Finally, upon excitation at 238 nm, Al4B2O9:Tb(3+ )emitted light at 489, 544, 588, and 622 nm.
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    LUMINESCENCE PROPERTIES OF Bi3+-DOPED Sr3B2O6
    (Springer, 2023) Pekgozlu, Ilhan
    The purpose of this study was to investigate the photoluminescence properties of Bi3+-activated Sr3B2O6. Pure Sr3B2O6 and Bi3+-doped Sr3B2O6 were synthesized by a solution combustion method. The phase and photoluminescence analyses of the borates that were synthesized were determined by using X-ray diffraction and a spectrofluorometer respectively at room temperature. It was observed that the synthesized Bi3+-doped Sr3B2O6 emitted blue light (441 nm) upon excitation with 366 nm. Finally, the Stokes shift of Sr3B2O6:Bi3+ was calculated and found to be 4646 cm(-1).
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    Removal of methyl blue (MB) from aqueous solution using strontium aluminoborate (SrAl2B2O7): synthesis, characterization and adsorption studies
    (Taylor & Francis Inc, 2024) Bayram, Okan; Gode, Fethiye; Pekgozlu, Ilhan
    Today, increasing dyes pollution is of great importance for life. Leaving the dyes used in industries such as textiles without being discharged pollutes other water sources. In order to prevent this, different methods are used in the literature. In this study, SrAl2B2O7, a borate metal, was used to remove methyl blue (MB), an anionic dye, by batch adsorption method. Strontium aluminoborate (SrAl2B2O7) was prepared using a solution combustion method at 950 degrees C for 4 h in air. The prepared adsorbent was characterized by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR). The particle morphology of the adsorbent was investigated using scanning electron microscope (SEM). By using N-2 adsorption-desorption, the Brunnauer, Emmet, and Teller (BET) specific surface area was found to be 1.9578 m(2) g(-1). The surface charge of the dye-adsorbed SrAl2B2O7 was determined based on zeta-potential measurements. Langmuir (R-2=0.9897), Freundlich (R-2=0.985), Dubinin & Radushkevic (R-2=0.976), Scatchard (R-2=0.881), Temkin & Pyzhev (R-2=0.978) isotherms were calculated in the study. SrAl2B2O7 showed good adsorption performance for methyl blue (MB) with maximum adsorption capacities of 29.069 mg g(-1) (Langmuir). Adsorption processes were also studied in detail. Thermodynamic and kinetic models; pseudo-first-order (R-2=0.415), pseudo-second-order (R-2=0.999), Elovich (R-2=0.968) showed that adsorption using SrAl2B2O7 in MB removal is endothermic and pseudo-second order.
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    SYNTHESIS AND PHOTOLUMINESCENCE PROPERTIES OF Pb2+-DOPED K2Al2B2O7
    (Springer, 2024) Pekgozlu, Ilhan
    Ultraviolet-emitting phosphors with the formula K2-xPbxAl2B2O7 (0.0025 <= x <= 0.03) were synthesized at 850 degrees C for 6 h in air. The powder X-ray diffraction technique was used to analyze the phases of all prepared borates. The FTIR technique was used to examine the bond structure of K2Al2B2O7. At room temperature, a spectrofluorometer was used to examine the photoluminescence characteristics of the prepared phosphors. K2Al2B2O7:Pb2+ was found to have emission and excitation bands at 373 and 271 nm, respectively. An extensive investigation was conducted on the correlation between emission intensity and Pb2+ content for K2-xPbxAl2B2O7. Consequently, 0.01 mol Pb2+ was found to be the optimal concentration in K2Al2B2O7. Eventually, it was found that the Stokes shift of the prepared material K2Al2B2O7:Pb2+ is 10,090 cm(-1) using the excitation band at 271 nm and the emission band at 373 nm. As a result of this investigation, a brand-new UVA radiation-emitting material has been established.
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    Use of Sr2Mg(BO3)2 in Congo red removal from aqueous solutions: Synthesis, adsorption, isotherm, kinetic study
    (Taylor & Francis Inc, 2023) Bayram, Okan; Moral, Emel; Pekgozlu, Ilhan; Gode, Fethiye
    Sr2Mg(BO3)(2) was prepared by a solution combustion method at 900 degrees C for 6 hour in air. The prepared adsorbent was characterized by X-Ray Diffraction (XRD). The XRD pattern of Sr2Mg(BO3)(2) is in agreement with the ICDD File No: 01-076-9795. The particle morphology of the adsorbent was investigated by scanning electron microscope (SEM). The average size of particles is about 3-10 mu m. The Congo red dye was removed from aqueous solution using Sr2Mg(BO3)(2). The effect of time, initial concentration, pH, temperature and dosage on adsorption were investigated. The Freundlich model fitted according to equilibrium data and maximum adsorption capacity is 886.952 mg/g. According to theories of pseudo-second-order kinetics, the removal procedure involves chemical adsorption. According to the thermodynamic data, negative Delta G values indicated that adsorption of Sr2Mg(BO3)(2) occurred spontaneously and negative Delta H values, the adsorption process was exothermic. Sr2Mg(BO3)(2) is a useable material for Congo red dye removal.