Browsing by Author "Kutluay, Sinan"

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Benzenin Buhar-fazı Adsorpsiyonunun İyileştirilmesi için Etkili Nano-adsorbentler Olarak Silika-kaplı Manyetik Fe3o4 Nanoparçacıkları
(2021) Ece, Mehmet Şakir; Ece, Mehmet Sakır; Şahin, Ömer; Department of Medical Services and Techniques / Tıbbi Hizmetler ve Teknikleri Bölümü
Bu çalışma, benzenin buhar-fazı adsorpsiyonunun iyileştirilmesi için silika-kaplı Fe3O4 (Fe3O4@SiO2) hazırlanmasına odaklandı. Fe3O4@SiO2 birlikte çökeltme yöntemi ile hazırlanırken karakterizasyonu FT-IR, SEM ve BET yüzey alanı analizleri kullanılarak gerçekleştirildi. Deneysel parametreler, yanıt yüzey metodolojisi (RSM) kullanılarak benzenin buhar-fazı adsorpsiyonu için değerlendirildi. Fe3O4@SiO2, aşağıdaki optimum koşullar altında 197,50 mg g-1 buhar-fazı benzeni adsorbe etti: 39,93 dakika kalma süresi, 13,57 mg l-1 başlangıç benzen konsantrasyonu ve 26,87°C sıcaklık. Benzenin Fe3O4@SiO2 üzerindeki buhar fazı adsorpsiyon mekanizması, DubininRadushkevich (D-R), Freundlich ve Langmuir dahil izotermler incelenerek netleştirildi ve deneysel veriler D-R modeline iyi bir şekilde uyduruldu. Benzenin Fe3O4@SiO2 üzerindeki buhar-fazı adsorpsiyon kinetiği, sözde birinci-dereceden (SBD) model ve sözde ikinci dereceden (SİD) model gibi kinetikler incelenerek netleştirildi, ve deneysel sonuçlar SİD modele uydu. Bu çalışma, Fe3O4@SiO2'nin umut verici düşük maliyetli nano-adsorbent olarak uygulama potansiyelini gösterdi.
Citation - WoS: 24
Citation - Scopus: 28
Comparative and competitive adsorption of gaseous toluene, ethylbenzene, and xylene onto natural cellulose-modified Fe3O4 nanoparticles
(ScienceDirect, 2022) Ece, Mehmet Şakir; Kutluay, Sinan; Department of Medical Services and Techniques / Tıbbi Hizmetler ve Teknikleri Bölümü
Many industrial processes produce volatile organic compound (VOC) pollutants within multicomponent systems. Therefore, exploring the comparative and competitive adsorption of VOCs is of both practical and scientific interest. This study elucidates the adsorption behavior of gaseous toluene, ethylbenzene, and xylene (TEX) targeted as VOCs onto natural cellulose-modified Fe3O4 (NC-Fe3O4) nanoparticles (NPs) both individually and in multicomponent systems for the first time in the literature. The characterization of NC-Fe3O4 synthesized via co precipitation method was carried out with analysis techniques including BET, SEM, EDS, FTIR, and TGA-DTA. The adsorption capacities of TEX as a single-component onto NC-Fe3O4 (for 20 mg L-1 TEX inlet concentration) were found as 477, 550, and 578 mg g(-1), respectively. In contrast, with TEX in a binary-component system, the adsorption capacity of the T (for 20 mg L-1 T with 10 mg L-1 E and 10 mg L-1 X, respectively) decreased by approximately 43% and 50% for the binary-mixtures of T-E and T-X, respectively, due to competition with E and X for adsorption sites. Similarly, the adsorption capacity of the E (for 20 mg L-1 E with 10 mg L-1 X) decreased by approximately 46% due to competition with the X for adsorption sites. With TEX in a ternary-component system, the adsorption capacity of the X remained consistent, indicating its competitive dominance over the E and T. The adsorption capacity of NC-Fe3O4 followed the order of X > E > T in the ternary-component system, which agrees with the adsorption results for the single-component system. The adsorption mechanism of TEX was explained by fitting the adsorption data to diverse kinetic and isotherm models. The NC-Fe3O4 with a superior performance in terms of both reuse efficiency and adsorption capacity, could be used as a promising and renewable adsorbent for efficient treatment of VOC pollutants. The findings of the current study will contribute to a better understanding of the comparative and competitive adsorption behaviors among different VOC pollutants in relation to a given adsorbent.
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 Bölümü
Uçucu 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.
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; Department of Medical Services and Techniques / Tıbbi Hizmetler ve Teknikleri Bölümü
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: 49
Development of Novel Fe3O4/AC@SiO2@1,4-DAAQ Magnetic Nanoparticles with Outstanding VOC Removal Capacity: Characterization, Optimization, Reusability, Kinetics, and Equilibrium Studies
(Industrial and Engineering Chemistry Research, 2021) Ece, Mehmet Şakir; Kutluay, Sinan; Şahin, Ömer; Horoz, Sabit; Department of Medical Services and Techniques / Tıbbi Hizmetler ve Teknikleri Bölümü
The adsorption of pollutants to the surface of adsorbents plays a critical role in the effectiveness of adsorption technology for air purification applications. Herein, novel magnetic nanoparticles functionalized with 1,4-diaminoanthraquinone (1,4-DAAQ), namely, Fe3O4/activated carbon (AC)@SiO2@1,4-DAAQ, were innovatively synthesized via co-precipitation and sol-gel techniques. After that, these nanoparticles were used for high-efficiency removal of volatile organic compounds (VOCs) (i.e., benzene and toluene). The synthesized nanoparticles were characterized by various techniques such as Fourier transform IR spectroscopy, thermogravimetric analysis/differential thermal analysis, scanning electron microscopy, and Brunauer-Emmett-Teller analysis. The dynamic adsorption process of VOCs was optimized based on operating parameters. The adsorption experiments revealed that Fe3O4/AC@SiO2@1,4-DAAQ showed exceptional performance for the removal of VOCs. It was observed that for benzene, Fe3O4, AC, Fe3O4/AC, Fe3O4/AC@SiO2, and Fe3O4/AC@SiO2@1,4-DAAQ exhibited dynamic adsorption capacities of 180.25, 228.87, 295.84, 382.10, and 1232.77 mg/g, respectively. Additionally, for toluene, they exhibited dynamic adsorption capacities of 191.08, 274.53, 310.26, 421.30, and 1352.16 mg/g, respectively. This indicated that the modification of 1,4-DAAQ could greatly enhance the dynamic adsorption capacity of Fe3O4/AC@SiO2@1,4-DAAQ for VOCs. In addition to the apparent adsorptive behavior in removing VOCs, Fe3O4/AC@SiO2@1,4-DAAQ exhibited high repeatability. After ten consecutive adsorption/desorption cycles, for benzene and toluene, Fe3O4/AC@SiO2@1,4-DAAQ retained 79.36 and 78.24% of its initial adsorption capacity, respectively. According to the characterization results, the average pore diameter for Fe3O4/AC@SiO2@1,4-DAAQ was determined to be 24.46 nm, indicating that they were in the mesopore range. The adsorption mechanism of the VOCs on Fe3O4/AC@SiO2@1,4-DAAQ was clarified by investigating the isotherm and kinetic criteria in detail. Isotherm models suggested that the adsorption process of VOCs is physical. Moreover, from the analysis of diffusion-based rate-limiting kinetic models, the findings reveal a combination of intraparticle diffusion as well as film diffusion throughout the adsorption process of VOCs. In addition, it was concluded from the analysis of the mass transfer model factors that global mass transfer and internal diffusion are more effective than film diffusion. The results demonstrated that the Fe3O4/AC@SiO2@1,4-DAAQ nanoadsorbent is a promising material for the effective removal of VOCs.
Citation - WoS: 2
Citation - Scopus: 1
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) Ece, Mehmet Şakir; Ece, Mehmet Sakir; Department of Medical Services and Techniques / Tıbbi Hizmetler ve Teknikleri Bölümü
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 - WoS: 32
Citation - Scopus: 36
Fabrication 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 Bölümü
The 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.]
Citation - WoS: 35
Citation - Scopus: 39
Fabrication and characterization of Fe3O4/perlite, Fe3O4/perlite@SiO2, and Fe3O4/perlite@SiO2@sulfanilamide magnetic nanomaterials
(SpringerLink, 2022) Ece, Mehmet Şakir; Şahin, Ömer; Ece, Mehmet Şakir; Department of Medical Services and Techniques / Tıbbi Hizmetler ve Teknikleri Bölümü
Abstract In this study, the fabrication of perlite-supported Fe3O4 (Fe3O4/perlite), SiO2-coated Fe3O4/perlite (Fe3O4/perlite@SiO2), and sulfanilamide-modified Fe3O4/perlite@SiO2 (Fe3O4/perlite@SiO2@sulfanilamide) magnetic nanomaterials and their characterization by various spectroscopic techniques were presented. For this purpose, first, Fe3O4/perlite was fabricated via the co-precipitation method. Then, Fe3O4/perlite@SiO2 and Fe3O4/perlite@SiO2@sulfanilamide nanomaterials were fabricated using the sol–gel method. The structural properties of the fabricated nanomaterials were characterized using Brunauer-Emmett-Teller (BET), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), SEM-energy-dispersive X-ray spectroscopy (EDX), thermogravimetric analysis-differential thermal analysis, and X-ray diffraction (XRD) analyses. The SEM, SEM–EDX, FTIR, and XRD analyses revealed that the fabrication and surface coatings of the Fe3O4/perlite, Fe3O4/perlite@SiO2, and Fe3O4/perlite@SiO2@sulfanilamide were successfully performed. It was concluded that the Fe3O4/perlite, Fe3O4/perlite@SiO2, and Fe3O4/perlite@SiO2@sulfanilamide showed a type IV-H3 hysteresis loop according to the International Union of Pure and Applied Chemistry classification. According to the BET analysis, it was found that the specific surface areas of the Fe3O4/perlite, Fe3O4/perlite@SiO2, and Fe3O4/perlite@SiO2@sulfanilamide were 8.09, 12.71, and 5.89 m2/g, respectively. The average pore radius of the Fe3O4/perlite, Fe3O4/perlite@SiO2, and Fe3O4/perlite@SiO2@sulfanilamide were 9.68, 7.91, and 34.69 nm, respectively, using the Barrett-Joyner-Halenda method. Moreover, the half-pore widths of the Fe3O4/perlite, Fe3O4/perlite@SiO2, and Fe3O4/perlite@SiO2@sulfanilamide were 2.27, 1.58, and 17.99 nm, respectively, using the density functional theory method. Furthermore, in light of characterization findings, the Fe3O4/perlite, Fe3O4/perlite@SiO2, and Fe3O4/perlite@SiO2@sulfanilamide were in crystalline cubic spinel form, and they had mechanical and thermal stability and a mesoporous structure. Within the framework of the results, these developed nanomaterials, which have potential in many applications, such as sustainable technologies and environmental safety technologies, were brought to the attention of related fields.
Citation - Scopus: 0
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; Department of Medical Services and Techniques / Tıbbi Hizmetler ve Teknikleri Bölümü
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: 27
Citation - Scopus: 30
Facile synthesis and comprehensive characterization of Ni-decorated amine groups-immobilized Fe3O4@SiO2 magnetic nanoparticles having enhanced solar cell efficiency
(Journal of Materials Science: Materials in Electronics, 2021) Ece, Mehmet Şakir; Ekinci, Arzu; Kutluay, Sinan; Şahin, Ömer; Horoz, Sabit; Department of Medical Services and Techniques / Tıbbi Hizmetler ve Teknikleri Bölümü
In this study, the synthesis and comprehensive characterization of Fe3O4@SiO2 magnetic nanoparticles (MNPs) immobilized with L-Arginine decorated with nickel (Ni) was achieved, and their ability in solar cell efficiency was evaluated. Fe3O4, Fe3O4@SiO2, Fe3O4@SiO2@L-Arginine and Fe3O4@SiO2@L-Arginine-Ni MNPs were prepared by co-precipitation and sol-gel methods. The structural, morphological, optical and textural properties of the prepared MNPs were clarified by Fourier Transform Infrared Spectroscopy (FTIR), Energy-Dispersive X-Ray (EDX), X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Brunauer–Emmett–Teller (BET), Thermal Gravimetric Analysis (TGA) and Ultraviolet-Visible (UV-Vis) analyzes. From the BET data, it is understood that the specific surface area of the prepared Fe3O4, Fe3O4@SiO2 and Fe3O4@SiO2@L–Arginine MNPs is 60.85, 28.99 and 29.84 m2/g, respectively. From the pore size distribution determined by Barrett-Joyner-Halenda (BJH) method, it was understood that the pore radius of Fe3O4, Fe3O4@SiO2 and Fe3O4@SiO2@L–Arginine MNPs were in the range of mesopore and the average pore radius was equal to approximately 11.03, 9.11 and 28.45 nm, respectively. It is assumed that the half pore widths calculated by the density functional theory (DFT) method of the prepared of Fe3O4, Fe3O4@SiO2 and Fe3O4@SiO2@L-Arginine MNPs are 5.58, ∼ 0.88, and ∼ 17.98 nm, respectively. The energy band gap of the prepared MNPs with spinel structure was determined as approximately 3.10 eV. In addition to the structural, morphological, optical and textural properties, the photovoltaic properties of the prepared MNPs were examined. Au/CuO/Fe3O4@SiO2@L–Arginine-Ni/ZnO/SnO2:F solar cell device was created by using existing Fe3O4@SiO2@L–Arginine-Ni MNPs as buffer layer. The power conversion efficiency (%) of the prepared Fe3O4@SiO2@L–Arginine-Ni MNPs based solar cell device was calculated as 1.84 %. This numerical result shows that the prepared Fe3O4@SiO2@L-Arginine-Ni MNPs can be used as a promising buffer layer in a solar structure.
Citation - WoS: 31
Citation - Scopus: 37
Highly improved solar cell efficiency of Mn-doped amine groups-functionalized magnetic Fe3O4@SiO2 nanomaterial
(Wiley Online Library, 2021) Kutluay, Sinan; Horoz, Sabit; Şahin, Ömer; Ekinci, Arzu
Herein, magnetic Fe3O4@SiO2 nanomaterial functionalized with amine groups (Fe3O4@SiO2@IPA) doped with manganese (Mn) was prepared, characterized and used for solar cell application. Fe3O4@SiO2@IPA-Mn was prepared via the co-precipitation and sol-gel techniques. Energy-dispersive X-ray (EDX), Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) measurements were performed to examine the structure of Fe3O4, Fe3O4@SiO2, Fe3O4@SiO2@IPA and Fe3O4@SiO2@IPA-Mn. General morphology and textural properties of the prepared magnetic nanomaterials were clarified by Brunauer-Emmett-Teller (BET) and scanning electron microscopy (SEM). In addition, Ultraviolet-visible (UV-Vis) spectroscopy and thermal gravimetric analysis (TGA) were used to have a knowledge about the energy band gap and thermal behavior of the prepared magnetic nanomaterials. The energy band gap of Fe3O4@SiO2@IPA with spinel structure was determined as approximately 2.48 eV. It was understood that Fe3O4, Fe3O4@SiO2 and Fe3O4@SiO2@IPA showed type IV-H3 hysteresis cycle according to IUPAC. From the BET data, it was determined that the specific surface areas of Fe3O4, Fe3O4@SiO2 and Fe3O4@SiO2@IPA were 60.85, 28.99 and 40.41 m(2)/g, respectively. The pore size distributions of Fe3O4, Fe3O4@SiO2 and Fe3O4@SiO2@IPA were calculated as 8.55, 1.53 and 1.70 nm, respectively, by the BJH method. Also, it was observed that the dominant pore widths of Fe3O4, Fe3O4@SiO2 and Fe3O4@SiO2@IPA were calculated similar to 5.58, similar to 0.88 and similar to 17.92 nm, respectively, by the DFT method. Au/CuO/Fe3O4@SiO2@IPA-Mn/ZnO/SnO2: F solar cell device was created using existing Fe3O4@SiO2@IPA-Mn as a buffer layer. The power conversion efficiency (%) of Fe3O4@SiO2@IPA-Mn based solar cell device was calculated as 2.054. This finding suggest that Fe3O4@SiO2@IPA-Mn can be used as a promising sensitizer in solar cell technology. Moreover, in this study, the effectiveness of the modification of manganese (one of the transition metals, which is cheap and easily available) with magnetic nanomaterials in the use of solar cell technology was demonstrated for the first time.
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 Bölümü
Bu 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.
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 Şakir; Kutluay, Sinan; Department of Medical Services and Techniques / Tıbbi Hizmetler ve Teknikleri Bölümü
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.