Browsing by Author "Sahin, Omer"

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Citation - WoS: 3
Citation - Scopus: 3
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) Ece, Mehmet Şakir; Ece, Mehmet Sakir; Horoz, Sabit; Kutluay, Sinan; Sahin, Omer; 21.02. Department of Medical Services and Techniques / Tıbbi Hizmetler ve Teknikleri Bölümü; 21. Vocational School of Health Services / Sağlık Hizmetleri Meslek Yüksekokulu; 01. Mardin Artuklu University / Mardin Artuklu Üniversitesi
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.
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) Ece, Mehmet Sakir; Ece, Mehmet Şakir; Kutluay, Sinan; Sahin, Omer; 21.02. Department of Medical Services and Techniques / Tıbbi Hizmetler ve Teknikleri Bölümü; 21. Vocational School of Health Services / Sağlık Hizmetleri Meslek Yüksekokulu; 01. Mardin Artuklu University / Mardin Artuklu Üniversitesi
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.
Citation - WoS: 41
Hydrogen Production by Using Ru Nanoparticle Decorated With Fe₃o_{4< Core-Shell Microspheres}
(Pergamon-elsevier Science Ltd, 2020) Ece, Mehmet Şakir; Ece, M. Sakir; Kazici, Hilal Celik; Sahin, Omer; Onat, Erhan; 21.02. Department of Medical Services and Techniques / Tıbbi Hizmetler ve Teknikleri Bölümü; 21. Vocational School of Health Services / Sağlık Hizmetleri Meslek Yüksekokulu; 01. Mardin Artuklu University / Mardin Artuklu Üniversitesi
Noble metals are commonly used in order to accelerate the NH3BH3 hydrolysis for H2 production as heterogeneous catalysts. The nanoparticles (NPs) of these metals can be applied as active catalysts in fluid reactions. Metal NPs included in the core-shell nano- structures emerged as well-defined heterogeneous catalysts. Additionally, unsupported NPs catalysts can be gathered easily among neighboring NPs and the separation/recovery of these catalysts are not efficient with traditional methods. For this reason, here, silica-shell configuration was designed which was functionalized with a magnetic core and amine groups and Ru NPs were accumulated on Fe3O4@SiO2-NH2 surface for H-2 production from NH3BH3. Fe3O4@SiO2-NH2-Ru catalysts demonstrated high catalytic activity as long as it has a hydrogen production rate of 156381.25 mLg(cat)(-1)min(-1) and a turnover frequency (TOF) of 617 mol(H2) mol(cat)(-1)min(-1) towards the hydrolysis dehydrogenation of AB at 30 degrees C. This result is significantly higher than most of the known catalysts. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.