Browsing by Author "Ecer, Ü."

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    Decolorization of Methylene Blue by Silver/Reduced Graphene Oxide-Ethylene Diamine Nanomaterial: Synthesis, Characterization, and Optimization
    (Springer, 2024) Ecer, Ü.; Yiğit, A.; Menges, N.; Şahan, T.
    In this study, ethylene diamine-coated reduced graphene oxide-supported silver composite (Ag/rGO-ED) was synthesized and used as an efficient catalyst for the decolorization of methylene blue (MB) in the presence of NaBH4. The morphology of the obtained material was elucidated using field emission scanning electron microscopy (FE-SEM), Fourier-transform infrared spectroscopy (FTIR), energy-dispersive X-ray analysis (EDX), transmission electron microscopy (TEM), and X-ray diffraction (XRD) techniques. The influences of four parameters (MB concentration (mg/L), NaBH4 amount (mM), catalyst amount (g/L), and contact time (s)) on the decolorization process were appraised and optimized via response surface methodology (RSM). For the decolorization of MB, the optimum solutions were obtained as Co of 32.49 mg/L, NaBH4 amount of 152.89 mM, catalyst amount of 0.83 g/L, and 101.39 s contact time with MB decolorization efficiency of 97.73%. MB, a pollutant in wastewater, was decolorized rapidly by Ag/rGO-ED with an efficiency of approximately 97%. The exploration of kinetics and thermodynamics was another major emphasis of the work. The activation energy (Ea) and rate constant (k) for the decolorization of MB were obtained as 37.9 kJ/mol and 0.0135 s−1, respectively. The obtained results show that the catalyst, a new composite material in the literature, is promising for decolorization of wastewater. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.
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    Synergistic Pd and Bi Decoration on g-C3N4: Toward High-Performance Glycerol Fuel Cell Anode Catalyst
    (Elsevier Ltd, 2026) Oruç, M.; Ecer, Ü.; Yayla, S.; Ulas, B.
    Glycerol electrooxidation (GEOR) in an alkaline medium was assessed using graphitic carbon nitride (g-C3N4)-supported PdBi bimetallic catalysts with different atomic ratios that were created using a NaBH4 reduction technique. The catalysts were comprehensively characterized by Inductively coupled plasma mass spectrometry (ICP-MS), X-ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), N2 adsorption–desorption, Scanning Electron Microscopy–Energy Dispersive X-ray Spectroscopy (SEM-EDX), and elemental mapping, and electrochemical techniques namely cyclic voltammetry (CV), chronoamperometry (CA), linear sweep voltammetry (LSV), and electrochemical impedance spectroscopy (EIS). Pd70Bi30/g-C3N4 had the best electrocatalytic performance among the synthesized catalysts, with the lowest onset potential (–0.31 V), the lowest charge transfer resistance, and the highest specific/mass activity (9.60 mA/cm2 and 180.8 mA/mgPd). Pd and Bi's synergistic interaction, the optimal d-band center position, and the efficient dispersion of nanoparticles on g-C3N4 were all credited with the increased activity. These findings show how atomic ratio tweaking and support material selection can be used to create high-performance anode catalysts for direct glycerol fuel cells (DGFCs). © 2025 Elsevier B.V.