Ece, Mehmet Şakir
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Ece, M.Ş.
Ece, Mehmet Sakir
Ece, M. Sakir
Ece, Mehmet Sakır
Ece, Mehmet Sakir
Ece, M. Sakir
Ece, Mehmet Sakır
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Department of Medical Services and Techniques / Tıbbi Hizmetler ve Teknikleri Bölümü
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Scholarly Output
21
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19
Citation Count
359
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2
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Now showing 1 - 10 of 21
Article Citation - Scopus: 39Hydrogen production by using Ru nanoparticle decorated with Fe3O4@SiO2–NH2 core-shell microspheres(International Journal of Hydrogen Energy, 2020) Ece, Mehmet Şakir; İzgi, Mehmet Sait; Kazıcı, Hilal Çelik; Şahin, Ömer; Onat, Erhan; Department of Medical Services and Techniques / Tıbbi Hizmetler ve Teknikleri BölümüNoble 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 nanostructures 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 H2 production from NH3BH3. Fe3O4@SiO2–NH2–Ru catalysts demonstrated high catalytic activity as long as it has a hydrogen production rate of 156381.25 mLgcat−1 min−1 and a turnover frequency (TOF) of 617 molH2molcat−1min−1 towards the hydrolysis dehydrogenation of AB at 30 °C. This result is significantly higher than most of the known catalysts.Article Manyetik Fe3o4/aktif Karbon Nanoparçacıklarının Sentezlenmesi ve Adsorpsiyon Prosesi ile Gaz-fazındaki Toluenin Giderilmesi için Uygulanması(2020) Ece, Mehmet Şakir; Şahin, Ömer; Ece, Mehmet Sakır; Department of Medical Services and Techniques / Tıbbi Hizmetler ve Teknikleri BölümüBu çalışmada, gaz-fazı toluenin adsorpsiyon prosesi ile giderilmesi için nano-adsorbent olarak aktif karbon ile fonksiyonelleştirilmiş manyetik Fe3O4 (Fe3O4/AC)'nin ilk uygulamasını sunuyoruz. Manyetik Fe3O4/AC, nanoteknoloji prensipleri çerçevesinde birlikte çöktürme yöntemi ile sentezlendi. Daha sonra, temas süresi, başlangıç toluen konsantrasyonu ve sıcaklık gibi proses koşullarının toluenin manyetik Fe3O4/AC ile adsorpsiyonu üzerindeki etkileri yanıt yüzeyi yöntemi (RSM) kullanılarak incelendi. Elde edilen manyetik Fe3O4/AC, taramalı elektron mikroskopisi (SEM), fourier dönüşümü kızılötesi spektroskopisi (FTIR) ve termogravimetrik (TG) analiz kullanılarak karakterize edildi. Toluenin adsorpsiyonu için manyetik Fe3O4/AC’ nin maksimum adsorpsiyon kapasitesi, 59,48 dakika temas süresi, 17,21 mg l-1 başlangıç toluen konsantrasyonu ve 26,01°C sıcaklıktaki proses koşulları altında 312,99 mg g -1 olarak belirlendi. Manyetik Fe3O4/AC tarafından adsorpsiyon, Langmuir izoterm modeli ile en iyi uyumu gösterdi ve sözde ikinci dereceden (PSO) kinetik modele uydu. Bu çalışma, manyetik Fe3O4/AC’nin, gaz-fazı toluenin giderilmesi için bir adsorbent olarak uygulanabileceğini gösterdi.Article Citation - WoS: 31Citation - Scopus: 33Competitive adsorption of VOCs (benzene, xylene and ethylbenzene) with Fe3O4@SiO2-NH@BENZOPHENONE magnetic nanoadsorbents(Elsevier, 2023) Ece, Mehmet Şakir; Ece, Mehmet Şakir; Department of Medical Services and Techniques / Tıbbi Hizmetler ve Teknikleri BölümüVolatile organic compounds (VOCs), which are toxic, mutagenic and carcinogenic, are considered a critical factor for air pollution and cause serious harm to the eco-environment and human health. In this study, Fe3O4, Fe3O4@SiO2-NH2, Fe3O4@SiO2-NH@BENZOFENONE were synthesized as new magnetic nanoadsorbents (MNAs) and used for the first time in the removal of gas-phase benzene, xylene and ethylbenzene. The synthesised MNAs were characterized by SEM-EDS, TEM, FTIR, XRD, VSM, TGA and BET analyses. The characterization results showed that the MNAs have mesoporous structure, type IV physioresorption and type H3 hysteresis loop character. In order to clarify the comparative and competitive adsorption behaviour, the adsorption capacity of Fe3O4@SiO2-NH@BENZOFENONE MNA was found to be in the order of xylene > ethylbenzene > benzene in both single, binary and ternary component systems. The adsorption kinetics of benzene, xylene and ethylbenzene with Fe3O4@SiO2-NH@BENZOFENONE MNA were found to be governed by multistep mechanisms. Fe3O4@SiO2-NH@BENZOFENONE MNA showed reuse efficiencies of 83.07%, 84.35% and 82.99% after 5 cycles for benzene, xylene and ethylbenzene respectively. In the framework of the results, Fe3O4@SiO2-NH@BENZOPHENONE MNA, which has a high potential in terms of both adsorption capacity and reuse efficiency, is proposed as a promising adsorbent for the efficient removal of benzene, xylene and ethylbenzene. © 2023 Elsevier B.V.Article Citation - WoS: 1Citation - Scopus: 2Remarkable Adsorptive Capacity and Reusability Performance of Magnetic Magnetite@silica@l-Histidine Nanocomposite Towards Gaseous Benzene Pollutant(Elsevier Sci Ltd, 2024) Ece, Mehmet Şakir; Kutluay, Sinan; Department of Medical Services and Techniques / Tıbbi Hizmetler ve Teknikleri BölümüHerein, 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.Article Citation - Scopus: 0Facile 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; Department of Medical Services and Techniques / Tıbbi Hizmetler ve Teknikleri BölümüIn 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.Master Thesis Güneş Pili Malzemesi Olarak Fe3O4@SiO2@3,4-DABF Sentezi,Karakterizasyonu ve Performansının Belirlenmesi(2024) Ece, Mehmet Şakir; Ece, Mehmet Şakir; Department of Medical Services and Techniques / Tıbbi Hizmetler ve Teknikleri BölümüBu tez çalışmasında, Fe3O4, Fe3O4@SiO2 ve Fe3O4@SiO2@3,4-DABF manyetik nano katalizörler sentezlenip karakterize edilip güneş hücresi cihazlarının karmaşık yapısındaki sensör olarak kullanımını test edildi. Fe3O4, Fe3O4@SiO2 ve Fe3O4@SiO2@3,4-DABF manyetik nano katalizörlerin yapısını karekterize etmek için FTIR analizi, SEM-EDS analizi, TEM analizi, VSM analizi, XRD analizi, TGA analizi ve BET analizi kullanıldı. Fe3O4, Fe3O4@SiO2 ve Fe3O4@SiO2@3,4-DABF manyetik nano katalizörler ile güneş hücresi cihazlarının karmaşık yapısındaki sensör olarak kullanımını testi gerçekleştirildi. Fe3O4, Fe3O4@SiO2 ve Fe3O4@SiO2@3,4-DABF manyetik nano katalizörler ≈ 10 nm çapa sahip olduğu, doyma manyetizasyon değerlerinin sırasıyla 61,64 emu/g, 37,31 emu/g ve 20,13 emu/g olduğu bulundu. Fe3O4, Fe3O4@SiO2 ve Fe3O4@SiO2@3,4-DABF manyetik nano katalizörlerin sıcaklığın bir fonksiyonu olarak meydana gelen kütle değişimi ve kütle kaybının sırasıyla % 6.5, % 12 ve % 28.1 olduğu, kristal özelliklerinin yüzey merkezli kübik spinel yapı olduğu anlaşıldı. Fe3O4, Fe3O4@SiO2 ve Fe3O4@SiO2@3,4-DABF manyetik nano katalizörlerin IUPAC sınıflamasına göre tip IV histerezis H3 döngüler sunduğu, mezogözenekli yapıya sahip olduğu tespit edildi. Fe3O4, Fe3O4@SiO2 ve Fe3O4@SiO2@3,4-DABF manyetik nano katalizörlerin, güneş hücrelerinde elde edilen verimlerin sırasıyla %1.49, %1.77 ve verim %2.15 olduğu, Fe3O4@SiO2@3,4-DABF'nin en yüksek verim değerine sahip olduğu analaşılmıştır. Elde edilen bulgular, Fe3O4, Fe3O4@SiO2 ve Fe3O4@SiO2@3,4-DABF manyetik nano katalizörlerin güneş hücresi teknolojisinde umut verici bir duyarlılaştırıcı olarak kullanılabileceğini gösterdi. Ayrıca bu çalışmada, ucuz, kolay ve çevre dostu olarak hazırlanan Fe3O4@SiO2@3,4-DABF manyetik nano katalizörlerin güneş pili teknolojisinin kullanımındaki etkinliği ilk kez ortaya konuldu.Article Citation - WoS: 32Citation - Scopus: 36Fabrication and characterization of 3,4-diaminobenzophenone-functionalized magnetic nanoadsorbent with enhanced VOC adsorption and desorption capacity(Environmental Science and Pollution Research, 2021) Ece, Mehmet Şakir; Şahin, Ömer; Kutluay, Sinan; Horoz, Sabit; Department of Medical Services and Techniques / Tıbbi Hizmetler ve Teknikleri BölümüThe present study, for the first time, utilized 3,4-diaminobenzophenone (DABP)-functionalized Fe3O4/AC@SiO2 (Fe3O4/AC@SiO2@DABP) magnetic nanoparticles (MNPs) synthesized as a nanoadsorbent for enhancing adsorption and desorption capacity of gaseous benzene and toluene as volatile organic compounds (VOCs). The Fe3O4/AC@SiO2@DABP MNPs used in adsorption and desorption of benzene and toluene were synthesized by the co-precipitation and sol-gel methods. The synthesized MNPs were characterized by SEM, FTIR, TGA/DTA, and BET surface area analysis. Moreover, the optimization of the process parameters, namely contact time, initial VOC concentration, and temperature, was performed by applying response surface methodology (RSM). Adsorption results demonstrated that the Fe3O4/AC@SiO2@DABP MNPs had excellent adsorption capacity. The maximum adsorption capacities for benzene and toluene were found as 530.99 and 666.00 mg/g, respectively, under optimum process parameters (contact time 55.47 min, initial benzene concentration 17.57 ppm, and temperature 29.09 °C; and contact time 57.54 min, initial toluene concentration 17.83 ppm, and temperature 27.93 °C for benzene and toluene, respectively). In addition to the distinctive adsorptive behavior, the Fe3O4/AC@SiO2@DABP MNPs exhibited a high reproducibility adsorption and desorption capacity. After the fifth adsorption and desorption cycles, the Fe3O4/AC@SiO2@DABP MNPs retained 94.4% and 95.4% of its initial adsorption capacity for benzene and toluene, respectively. Kinetic and isotherm findings suggested that the adsorption mechanisms of benzene and toluene on the Fe3O4/AC@SiO2@DABP MNPs were physical processes. The results indicated that the successfully synthesized Fe3O4/AC@SiO2@DABP MNPs can be applied as an attractive, highly effective, reusable, and cost-effective adsorbent for the adsorption of VOC pollutants. Graphical abstract[Figure not available: see fulltext.]Article Derik Halhalı Zeytin Çekirdeğinden Çevre Dostu Selülozik Manyetik Nano-adsorbent Üretimi ve Benzen Gideriminde Kullanılması(2021) Ece, Mehmet Şakir; Atku, Fesih; Şahin, Ömer; Kutluay, Sinan; Ece, Mehmet Sakır; Önal, Ferat; Department of Medical Services and Techniques / Tıbbi Hizmetler ve Teknikleri BölümüUçucu organik bir bileşik (UOB) olan benzen, kimyasal ve petrokimyasal gibi faaliyetlerle sanayiden ve endüstriden atmosfere salınmaktadır. Benzen, canlı sağlığı ve çevre için ağır kirliliklerden biri olup, kanserojen, mutajenik ve oldukça toksik polar olmayan bir kirleticidir. İnsan sağlığı ve ekolojik çevre için bir potansiyel tehlikedir. Bu sebeple benzenin bir kirletici olarak atmosferden uzaklaştırılması büyük önem taşımaktadır. Bu çevresel iyileştirme çalışmasında, Derik Halhalı zeytininin çekirdeği bir doğal selüloz (DS) kaynağı olarak manyetit ($Fe_3O_4$) modifikasyonunda kullanıldı. Başarıyla üretilen $Fe_3O_4$/DS nano-adsorbentin benzen giderimine karşı adsorpsiyon özellikleri incelendi. Birlikte çökeltme yöntemiyle elde edilen Fe3O4/DS nano-adsorbenti SEMEDS, FTIR ve BET analizleri ile karakterize edildi. Benzen giderim prosesinde, benzen başlangıç konsantrasyonu, adsorbent miktarı, adsorpsiyon süresi ve adsorpsiyon sıcaklığı gibi farklı parametrelerin etkileri değerlendirildi. Optimum değerler olarak belirlenen 90 dakika adsorpsiyon süresi, 15 ppm benzen başlangıç konsantrasyonu, 100 mg adsorbent miktarı ve 25°C adsorpsiyon sıcaklığı gibi koşullar altında benzen adsorpsiyon kapasitesi 298.15 mg/g olarak bulundu. Bu sonuç, başarıyla üretilen $Fe_3O_4$/DS nano-adsorbentin UOB kirleticilerin giderimindeki uygulama potansiyelini ortaya koymaktadır. Öte yandan, Quasi-birinci-dereceden kinetik modeli takip eden gaz halindeki benzenin $Fe_3O_4$/DS nano-adsorbenti üzerine adsorpsiyon prosesi fiziksel adsorpsiyon mekanizmasını işaret etmektedir. Ayrıca, 1.74 kJ/mol olarak hesaplanan E değeri (Dubinin-Radushkevich model sabiti) adsorpsiyon prosesinin fiziksel etkileşim mekanizması üzerinden gerçekleştiğini desteklemektedir. Son olarak, beş döngüden sonra, $Fe_3O_4$/DS nano-adsorbentin %90.61'lik bir yeniden kullanım verimini koruduğu bulundu, bu da nano-adsorbentin pratik uygulamalarda büyük bir potansiyele sahip olduğu anlamına geliyor.Article Citation - WoS: 39Citation - Scopus: 39Synthesis 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) Ece, Mehmet Şakir; Ece, Mehmet Sakir; Tural, Bilsen; Department of Medical Services and Techniques / Tıbbi Hizmetler ve Teknikleri BölümüClick 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.Article Citation - WoS: 3Citation - Scopus: 3Design 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; Department of Medical Services and Techniques / Tıbbi Hizmetler ve Teknikleri BölümüThis 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.
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