Browsing by Author "Ece, Mehmet Sakir"

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Citation - WoS: 3
Citation - Scopus: 4
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.
Citation - WoS: 43
Citation - Scopus: 43
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.
Synthesis, Characterization of a Novel Nickel-Organo Supported Magnetic Nanocatalysts (Fe3O4@SiO2@Tris@Ni): Effective Hydrogen Generation From Sodium Borohydride
(Elsevier Science SA, 2025) Umaz, Adil; Ece, Mehmet Sakir
Energy demand and environmental problems are increasing day by day as global threats. The burning of fossil fuels has harmful effects on ecological systems. Global threats related to energy can be eliminated by environmentally friendly, cost-effective, and renewable resources. Hydrogen is among the sustainable and renewable energy sources due to being the most common element on earth, non-toxic reaction products and having high calorific value. It was the first time nickel-organo-silica supported magnetic nanocatalysts (MNCs) were synthesised in this study. These synthesized MNCs were characterized in detail. Then, these MNCs were used to produce hydrogen from sodium borohydride in high efficiency. The saturation magnetization value and average particle size of the Fe3O4@SiO2@Tris@Ni MNCs have been measured as 33.27 emu/g and 10.26 nm, respectively. The Fe3O4@SiO2@Tris@Ni MNCs were used for the first time in hydrogen generation in this study. The hydrogen generation by sodium borohydride (NaBH4) methanolysis/ethylene glycolysis of the catalyst has been carried out at 298 K using 0.75 % NaBH4, 75 mg nanocatalyst, and 20 mL methanol/ethylene glycol. The amount of hydrogen produced in the methanol/ethylene glycol processes has been measured as 2167 mL H2/g NaBH4. The highest hydrogen generation rate has been obtained using 0.75 % NaBH4, 75 mg catalyst, and 20 mL ethylene glycol, and this value was calculated as 1067 mL H2/(min & sdot;gcat). The reusability performance of the catalyst was determined to have a decrease of 25.86 % after the fifth cycle compared to the initial use. According to these results, the catalyst is a promising material with advantages such as high efficiency in hydrogen generation and the possibility of repeated use.
Citation - WoS: 9
Citation - Scopus: 7
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.
Citation - Scopus: 2
Design, Synthesis, Characterization, and Surface Texture Investigation of a Novel Nickel-Supported Magnetic Nanocatalyst (Hierarchical Layered) for Efficient Hydrogen Production (Hydrolysis/Alcoholysis)
(Elsevier, 2025) Umaz, Adil; Ece, Mehmet Sakir
In this study, Fe3O4@TROMETHAMINE-Ni magnetic nanocatalysts (MNCs) were synthesized for the first time. Various characterization techniques, including fourier transform infrared spectroscopy (FTIR), x-ray diffractometer (XRD), scanning electron microscopy (SEM), pulsed sample magnetometer, electron paramagnetic resonance (EPR), and surface area measurement (BET), have been used to elucidate the structure and morphology of Fe3O4@TROMETHAMINE-Ni MNCs. The average particle size, surface area, and saturation magnetization value of Fe3O4@TROMETHAMINE-Ni MNCs have been measured as 7.97 nm, 60.11 m2/g, and 43.49 emu/g, respectively. The Fe3O4@TROMETHAMINE-Ni MNCs were determined to be superparamagnetic. EPR analysis was used to calculate the g-factor values before and after sodium borohydride (NaBH4) hydrolysis of Fe3O4@TROMETHAMINE-Ni MNCs, which were found to be 4.81 and 4.95, respectively. This value indicates that the electrons surrounding the oxygen vacancies formed on the catalyst surface can enhance transport efficiency and improve catalytic activity. It was optimized by many parameters in hydrogen production with hydrolysis/alcoholysis of NaBH4 using Fe3O4@TROMETHAMINE-Ni MNCs. For hydrogen production by NaBH4 hydrolysis of Fe3O4@TROMETHAMINE-Ni MNCs, it has been carried out using 265 mM NaBH4, 75 mg Fe3O4@TROMETHAMINE-Ni MNCs, and 20 mL of pure water/methanol at room temperature. The amount of hydrogen produced under optimum conditions has been measured as 1533 mL/min & sdot;gcat. It was determined that the reusability performance of Fe3O4@TROMETHAMINE-Ni MNCs showed a minor decrease of 8.42 % compared to the initial usage after the sixth cycle. These results show that Fe3O4@TROMETHAMINE-Ni MNCs are a promising material with advantages such as high efficiency in hydrogen production and the ability to be used repeatedly.
Citation - WoS: 1
Citation - Scopus: 2
Synthesis and Characterization of Fe3O4/MethylCellulose@Pb as a Heterogeneous Fenton-Like Catalyst for Photodegradation of Different Dyes
(Elsevier, 2025) Umaz, Adil; Ece, Mehmet Sakir
With the development of industry, serious pollution has emerged in water resources. This poses serious problems for the health of living things and the environment. To deliver a sustainable future, producing effective, low-cost, and reusable photocatalysts in wastewater treatment is important. In this study, Fe3O4/MetCel@Pb photo-catalysts were synthesized for the first time. The properties of Fe3O4/MetCel@Pb photocatalysts were characterized by Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), Brunauer-Emmett-Teller (BET), Ultraviolet-Visible Spectrophotometry (UV-Vis), Vibrating Sample Magnetometry (VSM), Electron Spin Resonance (ESR), Scanning Electron Microscopy (SEM), Transmission Electron Microscope (TEM), and X-ray Photoelectron Spectroscopy (XPS). The average particle size, surface area, band gap energy, saturation magnetization, resonance magnetic field, and g-factor values of the Fe3O4/MetCel@Pb photocatalysts measured as 63.88 nm, 40.59 m2 g-1, 5.71 eV, 24.80 emu g-1, 390.15 mT, and 1.731, respectively. XPS analysis showed signals confirming strong C-O bonds, Fe-O bonds, Fe2+, and Fe3+ at binding energies of 286.04, 528.00, 711.39, and 723.84 eV, respectively. Also, Fe3O4/MetCel@Pb photocatalysts were used for the first time in the dye degradation. The degradation of methylene blue (MB), methyl orange (MO), phenol red (PR), alizarin yellow (AY), and bromthymol blue (BTB) dyes under ultraviolet-visible light for 30 min was determined as 100 %, 96.76 %, 94.51 %, 80.81 %, and 71.93 %, respectively. In the reusability study, Fe3O4/MetCel@Pb photo-catalysts showed a reduction rate of 1.70 % compared to the first cycle even after the fourth cycle. The stability and repeated reusability of Fe3O4/MetCel@Pb photocatalysts without deformation were realized. Application of Fe3O4/MetCel@Pb photocatalysts in real dyed water samples (even in mixed matrix samples) showed over 90 % dye degradation efficiency. This confirms that the photocatalyst is an effective catalyst in dye degradation. Fe3O4/MetCel@Pb photocatalysts, which are economical, easy to prepare, and stable, will be an effective option for the removal of industrial waste paints (cationic and anionic dye) from aqueous systems. In addition, using these photocatalysts will provide ease of process, as well as time and cost savings.
Citation - WoS: 1
Citation - Scopus: 2
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.
Citation - WoS: 1
Citation - Scopus: 1
Facile Synthesis and Characterization of Fe3O4@SiO2 Core-Shell Magnetic Nanocomposite Functionalized With 4-Piperidinecarboxylic Acid for Dynamic Adsorption of Xylene
(Elsevier Science Inc, 2025) Kutluay, Sinan; Sahin, Omer; Ece, Mehmet Sakir
In the present study, a novel Fe3O4@SiO2@4-PCA core-shell magnetic nanocomposite (NC) was synthesized, characterized and evaluated for its potential in the removal of xylene in the gas phase, a volatile organic compound (VOC). Comprehensive characterization techniques including SEM, EDX, FTIR, XRD, BET, TGA and VSM were employed to analyze the structural and functional properties of Fe3O4, Fe3O4@SiO2, and Fe3O4@- SiO2@4-PCA NCs. Among the materials tested, Fe3O4@SiO2@4-PCA exhibited the highest xylene adsorption capacity of 649 mg/g, significantly outperforming Fe3O4 (251 mg/g) and Fe3O4@SiO2 (372 mg/g). Kinetic studies indicated that the pseudo-second order model best described the adsorption process, while isotherm analysis showed a strong fit with the Langmuir model, suggesting a favorable physical adsorption mechanism. It was highlighted that the adsorption mechanism of xylene on Fe3O4@SiO2@4-PCA NCs can be attributed to electrostatic interactions, hydrogen interactions, dipole-dipole interactions, van der Waals interactions, functional groups and hydrogen bonding. Additionally, re-usability tests demonstrated that Fe3O4@SiO2@4-PCA maintained 90.48 % of its re-use efficiency after five cycles, highlighting its stability and practical applicability. The enhanced adsorption performance is attributed to the hierarchical modification and surface functionalization with 4-piperidinecarboxylic acid (4-PCA), which increases the active sites and interactions with xylene. Fe3O4@SiO2@4-PCA demonstrated exceptional potential as an adsorbent for xylene, with superior performance compared to existing materials. These findings suggest that Fe3O4@SiO2@4-PCA NCs are promising candidates for VOC removal in industrial applications, offering a sustainable approach to reducing air pollution and protecting the environment.
Evaluation of the Structural, Morphological, Magnetic, Optical, and Dielectric Properties of a Novel Fe3O4@1.4-DHBNanocomposites
(Elsevier Science S.A., 2025) Ece, Muhyettin; Umaz, Adil; Ece, Mehmet Sakir
This study focuses on the detailed analysis of the synthesis, structural, morphological, surface textural, magnetic, optical, and electrical properties of Fe3O4@1,4-DHB magnetic nanocomposites (MNCs). Fe3O4@1,4-DHB MNCs were produced by a one-step chemical reaction process with a core-shell strategy. The average crystallite size, dislocation density, micro-strain, saturation magnetization, surface area and band gap energy values of Fe3O4@1,4-DHB MNCs were measured as 8.14 nm, 15.86 x 10-3 nm-2, 3.74 x 10-3, 41.96 emu/g, 101.96 m2/g and 4.38 eV, respectively. Fe3O4@1,4-DHB MNCs were determined to have an inverse spinel structure, exhibit superparamagnetic, and mesoporous characteristics. The narrow band gap of Fe3O4@1,4-DHB MNCs reveals that it has a wide light usage range and exhibits optical properties. The behaviors of the parameters Bode curve, dielectric constant, dielectric loss factor, loss tangent value, capacitance, admittance (susceptance, conductance), and real electric modulus, loss electric modulus of Fe3O4@1,4-DHB MNCs were investigated. The series resistance of Fe3O4@1,4-DHB MNCs was measured as 402 S2, capacitance as 2.352 x 10-11 F, and charge transfer resistance as 227.3 kS2. It was observed that increasing the frequency decreased the dielectric constant, dielectric loss factor, tans (after a certain value), and capacitance values. However, increasing the applied voltage (at low frequency) increased the phase angle, dielectric loss factor, tans values, capacitance values, and conductance values in a smooth regime. Because this nanocomposite exhibits magnetic, optical and dielectric properties, it can play an important role as a material that can be used in various applications in many branches of industry in the future.