Browsing by Author "Ece, Mehmet Sakir"

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Design of Superparamagnetic Fe3o4@sio2@3,4-Dabp Nanocatalysts, Fabrication by Co-Precipitation and Sol-Gel Methods, Characterization of Detailed Surface Texture Properties and Investigation of Solar Cell Performance
(Elsevier, 2024) Kochan, Ali; Ece, Mehmet Sakir; Horoz, Sabit; Kutluay, Sinan; Sahin, Omer
This research focuses on the synthesis, characterization, and evaluation of Fe3O4, Fe3O4@SiO2, and Fe3O4@- SiO2@3,4-DABP magnetic nanocatalysts (MNCs) for their potential use as sensors within the intricate architectures of solar cell devices. Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS), transmission electron microscopy (TEM), vibrating sample magnetometry (VSM), X-ray diffraction (XRD), thermogravimetric analysis (TGA) and Brunauer-Emmett-Teller (BET) surface area measurements were carried out to characterize the structural, morphological and magnetic properties of the MNCs. The MNCs exhibit an average particle size of approximately 10 nm. Fe3O4, Fe3O4@SiO2, and Fe3O4@SiO2@3,4-DABP MNCs have saturation magnetization values of 61.64 emu/g, 37.31 emu/g, and 20.13 emu/g, respectively. Thermal analysis reveals mass change losses of 6.5%, 12% and 28.1%, respectively, indicating different thermal stability profiles. It confirms that their crystal structure is face-centered cubic spinel, with type IV hysteresis loops and H3 loops indicating a mesoporous structure according to the IUPAC classification. Efficiency tests of Fe3O4, Fe3O4@SiO2 and Fe3O4@SiO2@3,4-DABP MNCs in solar cell devices show efficiencies of 1.49%, 1.77% and 2.15%, respectively. As the hierarchical modification of the MNCs increases, the efficiency of the solar cell devices increases. These results highlight the potential of Fe3O4, Fe3O4@SiO2 and Fe3O4@SiO2@3,4-DABP as promising sensitizers in solar cell technology. Fe3O4@SiO2@3,4-DABP MNCs have high catalytic activity, chemical stability, electronic conductivity and low cost. This study also marks the first demonstration of the effectiveness of environmentally friendly Fe3O4@SiO2@3,4-DABP MNCs in enhancing solar cell performance, prepared via a cost-effective, simple and eco-friendly approach.
Exploring Enhanced Gas-Phase Toluene Adsorption by Engineered a Novel Magnetic Nanoadsorbent Modified With P-Aminobenzoic Acid: Insights on Characterization, Performance, Kinetics, Isotherm, Mechanism and Reusability
(Elsevier, 2025) Kutluay, Sinan; Ece, Mehmet Sakir
In this study, a novel magnetic nanoadsorbent (MNA), Fe3O4@SiO2 functionalized with p-aminobenzoic acid (pAMBA), was prepared, characterized, and assessed for its efficiency in removing gas-phase toluene, a volatile organic compound (VOC). The Fe3O4, Fe3O4@SiO2, and Fe3O4@SiO2@p-AMBA MNAs were prepared and subjected to comprehensive analysis using techniques such as FTIR, SEM, EDX, VSM, XRD, TGA and BET to clearly reveal their properties through detailed characterization. Adsorption studies revealed that the Fe3O4@SiO2@pAMBA exhibited the highest capacity, with an adsorption value of 555 mg/g for toluene, compared to 188 mg/g for Fe3O4 and 321 mg/g for Fe3O4@SiO2. The modification with p-AMBA significantly improved the adsorption performance of the material. Kinetic and isotherm models indicated that the adsorption process is best described by the pseudo-2nd-order kinetic model and by the Dubinin-Radushkevich isotherm model, suggesting both physical and chemical adsorption mechanisms. Furthermore, the reusability and adsorption stability performance of the MNAs was evaluated. The MNAs continued exhibiting excellent adsorption, with reuse efficiencies of 83 % (corresponding to 158 mg/g) for Fe3O4, 86 % (corresponding to 279 mg/g) for Fe3O4@SiO2, and 87 % (corresponding to 486 mg/g) for Fe3O4@SiO2@p-AMBA after five consecutive cycles, indicating superior structural and regeneration abilities. The results highlight the significant effect of surface modification on adsorption efficiency, positioning Fe3O4@SiO2@p-AMBA as a promising material for VOC removal and air pollution control. This work highlights the importance of developing sustainable materials to address environmental challenges.
Remarkable Adsorptive Capacity and Reusability Performance of Magnetic Magnetite@silica@l-Histidine Nanocomposite Towards Gaseous Benzene Pollutant
(Elsevier Sci Ltd, 2024) Ece, Mehmet Sakir; Kutluay, Sinan
Herein, magnetic magnetite@silica@L-histidine (Fe3O4@SiO2@L-Hist) core-shell nanoparticles (NPs) were prepared as novel adsorbents via chemical co-precipitation and sol-gel technology for the adsorption of gaseous benzene pollutant. The Fe3O4, Fe3O4@SiO2 and Fe3O4@SiO2@L-Hist NPs were characterized using a combination of scanning electron microscopy (SEM), SEM- energy dispersive X-ray (SEM-EDX), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), vibrating sample magnetometry (VSM), Brunauer-EmmettTeller analysis (BET), X-ray photoelectron spectroscopy (XPS) and thermal gravimetric analysis (TGA). The adsorption capacities of Fe3O4, Fe3O4@SiO2 and Fe3O4@SiO2@L-Hist NPs for benzene were found to be 188, 279 and 481 mg g-1, respectively, with Fe3O4@SiO2@L-Hist NPs demonstrating the highest capacity. Kinetic and isotherm studies indicated that the pseudo-2nd-order kinetic model and the Langmuir isotherm model provided the best fit to the experimental data, suggesting favorable physical adsorption. In addition, Fe3O4, Fe3O4@SiO2 and Fe3O4@SiO2@L-Hist NPs exhibited remarkable reusability, with reuse efficiencies of 85.67, 89.65 and 91.73 %, respectively, after five recycle cycles, demonstrating their potential for practical benzene remediation applications. Overall, this study offers valuable insights into creating effective and sustainable adsorbents for eliminating volatile organic compounds (VOCs). This contributes to mitigating air pollution and safeguarding both human health and the environment.
Synthesis of novel magnetic nano-sorbent functionalized with N-methyl-D-glucamine by click chemistry and removal of boron with magnetic separation method
(ACADEMIC PRESS INC ELSEVIER SCIENCE, 2018) Tural, Servet; Ece, Mehmet Sakir; Tural, Bilsen
Click chemistry refers to a group of reactions that are fast, simple to use, easy to purify, versatile, regiospecific, and give high product yields. Therefore, a novel, efficient magnetic nano-sorbent based on N-methyl-D-glucamine attached to magnetic nanoparticles was prepared using click coupling method. Its boron sorption capacity was compared with N-methyl-D-glucamine direct attached nano-sorbent. The characterization of the magnetic sorbents was investigated by several techniques such as X-ray diffraction, scanning electron microscope, transmission electron microscope, dynamic light scattering, thermogravimetric analysis, Fourier transform infrared spectrophotometer, and vibrating sample magnetometer. The boron sorption capacity of sorbents was compared by studying various essential factors influencing the sorption, like sorbate concentration, sorbents dosage, pH of the solution, and contact time. Langmuir and Freundlich and Dubinin-Radushkevich adsorption isotherms models were applied. Percent removal and sorption capacities efficiencies of sorbents obtained with direct and click coupling are found to be 49.5%, 98.7% and 6.68 mg/g, 13.44 mg/g respectively. Both sorbents have been found to be compatible with Langmuir isotherm, and the boron sorption kinetics conforms to the pseudo second order kinetics. The reusability study of sorbents was carried out five times for boron sorption and desorption.