Güler, Enver
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G.,Enver
Guler, Enver
G., Enver
E., Güler
E.,Güler
Güler,E.
Enver, Güler
E., Guler
Guler,E.
Enver, Guler
Guler E.
Güler E.
Güler, Enver
E.,Guler
Guler, E.
Guler, Enver
G., Enver
E., Güler
E.,Güler
Güler,E.
Enver, Güler
E., Guler
Guler,E.
Enver, Guler
Guler E.
Güler E.
Güler, Enver
E.,Guler
Guler, E.
Job Title
Doçent Doktor
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enver.guler@atilim.edu.tr
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Chemical Engineering
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Sustainable Development Goals
2
ZERO HUNGER
1
Research Products
6
CLEAN WATER AND SANITATION
9
Research Products
7
AFFORDABLE AND CLEAN ENERGY
13
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8
DECENT WORK AND ECONOMIC GROWTH
1
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9
INDUSTRY, INNOVATION AND INFRASTRUCTURE
2
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12
RESPONSIBLE CONSUMPTION AND PRODUCTION
2
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13
CLIMATE ACTION
1
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14
LIFE BELOW WATER
2
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15
LIFE ON LAND
1
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17
PARTNERSHIPS FOR THE GOALS
1
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Documents
29
Citations
1555
Scholarly Output
33
Articles
21
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208/3011
Supervised MSc Theses
6
Supervised PhD Theses
1
WoS Citation Count
143
Scopus Citation Count
246
WoS h-index
8
Scopus h-index
10
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0
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0
WoS Citations per Publication
4.33
Scopus Citations per Publication
7.45
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9
Supervised Theses
7
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| Journal | Count |
|---|---|
| Journal of Membrane Science and Research | 4 |
| Membranes | 3 |
| International Journal of Hydrogen Energy | 2 |
| BOR DERGİSİ | 1 |
| Current Trends and Future Developments on (Bio-) Membranes: Recent Achievements for Ion-Exchange Membranes | 1 |
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33 results
Scholarly Output Search Results
Now showing 1 - 10 of 33
Article Citation - WoS: 11Citation - Scopus: 13Characterization and Fuel Cell Performance of Divinylbenzene Crosslinked Phosphoric Acid Doped Membranes Based on 4-Vinylpyridine Grafting Onto Poly(ethylene-Co Films(Pergamon-elsevier Science Ltd, 2018) Guler, Enver; Sadeghi, Sahl; Gursel, Selmiye AlkanThe effect of divinylbenzene (DVB) as crosslinker on the graft polymerization of 4-vinylpyridine (4VP) from poly(ethylene-co-tetrafluoroethylene) (ETFE) films was studied. The resulted films were doped with phosphoric acid (PA) and characterized for mechanical, surface, thermal properties, and fuel cell performance. The crosslinked membrane obtained from grafting a mixture of 4VP with 1% DVB improved the polymerization kinetics and resulted in about 50% graft level depending on graft conditions. The crosslinked membranes were also found to have better mechanical properties compared to its non-crosslinked counterpart. The resulted membrane exhibited proton conductivity as high as 75 mS/cm under 50% relative humidity (RH) at 120 degrees C, besides almost doubling the power output of fuel cell compared to a non-crosslinked membrane. To the best of our knowledge, DVB crosslinked 4VP based ETFE membranes were, for the first time, tested in practical fuel cell test station correlating their performance to operating temperature. Furthermore, surface properties of produced membranes were additionally correlated to the degree of crosslinking. Humidity dependence is less pronounced in the produced membranes resulting in strong potential for testing at intermediate temperature (80-120 degrees C) polymer electrolyte membrane fuel cells. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.Master Thesis Alkali Yakıt Hücreleri için Yarı-iç İçe Geçen Polietersülfon Kuaternize Nişasta Polimer Ağına Dayalı Anyon Değişim Membranı(2021) Almurumudhe, Osamah Kadhım Hılal; Güler, EnverZehirli emisyonlar olmadan güç üretmeye yönelik birçok etkili cihaz ortaya çıkmış ve geliştirilmiştir. Proton değişim membranlı yakıt hücresi (PEMFC) bu etkili cihazlardan biridir. Elektrokatalizör olarak platine tamamen bağımlı olması son derece rekabetçi olan pazardaki uygulamasını sınırlandırmıştır. Değerli olmayan metal katalizörün potansiyel kullanımı, anyon değişim membranlı yakıt hücresinin (AEMFC) yeniden dikkati çekmesini sağlamıştır. Anyon değişim membranı (AEM), AEMFC'nin kalbi olarak kabul edilir ve aynı zamanda AEM´lerin hazırlanması, bu yakıt hücrelerin geliştirilmesindeki en büyük zorluk olarak kabul edilmiştir. Yüksek iletkenliğe ve yüksek alkali direncine sahip anyon değişim membranların üretimi, bu alanda aktif bir araştırma alanı haline gelmiştir. Bu çalışmada, alkali yakıt hücreleri için iki tür anyon değişim membranı, basit ve yeni bir stratejiye göre tek aşamalı kuaternizasyon yöntemi ile üretilmiştir, Nişastanin kolin klorür ve epiklorohidrin ile kuaternizasyonu ̸ çapraz bağlanması ve ardından polietersülfon (PES) ile karıştırılması, iç içe geçen bir polimer ağıyla (IPN) sonuçlanmıştır. Birinci tip, 133.33 μm kalınlığa sahip gözenekli polieter sülfon AEM, % 376.7 su alımı ve % 5.3 şişmevi oranı sergilemiştir. İkinci tip ise, 55.48 μm ile yoğun polieter sülfon AEM, % 69.9 su alımı ve % 7.5 şişme oranı sergilemiştir. Karakterizasyon sonuçları, üretim rotamızın çok başarılı olduğunu ve üretilen anyon değiştirici membranlarımızın alkali yakıt hücresi uygulamaları için umut verici olduğunu doğrulamıştır.Book Part Citation - Scopus: 3Ion Exchange Membranes in Electrodialysis Process for Wastewater Treatment(Elsevier, 2023) Altıok,E.; Cihanoğlu,A.; Güler,E.; Kabay,N.Water is the most important natural resource on earth. Survival without water is impossible and industries cannot operate without water as well. Availability of safe and reliable source of water is therefore essential. Different practical solutions are needed for sustainable preservation of water resources as freshwater resources are limited in terms of technical and economical aspects. Membrane technologies can be applied to water and wastewater treatment for removal of various unwanted substances from water. Recently, the utilization of membrane technologies in the water purification sector has grown exponentially. Compared to conventional reclamation methods, membrane technologies are much more efficient for removal of various contaminants and they are able to overcome more stringent water regulations. Membrane separation processes employed for water treatment include reverse osmosis, nanofiltration, ultrafiltration, microfiltration, and electrodialysis (ED). In this chapter, we reviewed the basic principles of electromembrane processes, such as ED, electrodeionization, electrodialysis reversal, and bipolar membrane ED based on ion exchange membranes (IEMs) along with few examples of the use of these processes in water and wastewater treatment. In addition, fouling of IEMs is also discussed. © 2024 Elsevier Inc. All rights reserved.Article Citation - WoS: 6Citation - Scopus: 6Salinity Gradient Energy Conversion by Custom-Made Interpolymer Ion Exchange Membranes Utilized in Reverse Electrodialysis System(Elsevier Sci Ltd, 2023) Altiok, Esra; Kaya, Tugce Zeynep; Smolinska-Kempisty, Katarzyna; Guler, Enver; Kabay, Nalan; Tomaszewska, Barbara; Bryjak, MarekReverse electrodialysis (RED) is one of methods to extract salinity gradient energy between two aqueous solu-tions with different salt concentrations. In this work, custom-made interpolymer ion exchange membranes were employed in the RED stack. The effects of divalent (Mg2+, Ca2+ , SO42-) and monovalent (Li+, K+ and Cl-) ions in the feed solutions prepared from NaCl salt as a function of such process parameters as number of membrane pairs, flow rate , salinity ratio on power generation by the RED method were studied. It was shown that the maximum power density of 0.561 W/m2 was reached by using three membrane pairs using 1:45 of salt ratio with a feed flow rate of 120 mL/min using only NaCl salt in the feed solutions. The maximum power density was 0.398 W/m2 at 120 mL/min of the flow rate of the feed solutions composed of 90 wt% NaCl and 10 wt% KCl by using a salt ratio of 1:30 while the lowest power density of 0.246 W/m2 was obtained with a feed flow rate of 30 mL/min in the presence of SO42-ions with a similar salt ratio. Consequently, it was seen that while the presence of divalent ions in NaCl solutions had negative impact on power generation by RED system, the addition of monovalent ions having smaller hydrated radius than that of the Na+ ions contributed positively to the power generation.Article Citation - WoS: 15Metal-Salt Enhanced Grafting of Vinylpyridine and Vinylimidazole Monomer Combinations in Radiation Grafted Membranes for High-Temperature PEM Fuel Cells(Amer Chemical Soc, 2020) Mojarrad, Naeimeh Rajabalizadeh; Sadeghi, Sahl; Kaplan, Begum Yarar; Guler, Enver; Gursel, Selmiye AlkanProton exchange membranes were prepared and characterized for utilization in high-temperature proton exchange membrane fuel cells, HT-PEMFCs. 1-vinylimidazole (1-VIm) and 4-vinylpyridine (4VP) monomers were simultaneously grafted onto pre-irradiated ETFE (ethylene-co-tetrafluoroethylene) films which were prepared using gamma-rays with a dose of 100 kGy, as a robust substrate to prepare acid-base composite membranes. The grafting reaction was performed at 60 degrees C for 24 h followed by protonation via phosphoric acid doping in the subsequent step. The effect of adding ferrous salts as promoters in grafting was investigated by characterization of resultant membranes via thermal gravimetric analysis and mechanical tests. The fuel cell tests were conducted under different relative humidities (RHs) and applied temperatures. Membranes prepared with salt addition exhibited superior proton conductivities. Results including up to 80 mS cm(-1) conductivity at 110 degrees C in 60% RH and excellent thermal stability, even at 300 degrees C, suggest these membranes are promising for HT-PEMFC applications.Article Citation - WoS: 24Citation - Scopus: 28Enhancing Proton Conductivity Via Sub-Micron Structures in Proton Conducting Membranes Originating From Sulfonated Pvdf Powder by Radiation-Induced Grafting(Elsevier Science Bv, 2018) Sadeghi, Sahl; Sanli, Lale Isikel; Guler, Enver; Gursel, Selmiye AlkanWe report here submicron-structured proton conducting poly(vinylidene fluoride)-graft-poly(styrene sulfonic acid) (PVDF-g-PSSA) membranes for polymer electrolyte membrane fuel cells (PEMFC). Highly conductive proton exchange membranes were obtained by single-step radiation grafting of sodium styrene sulfonate (SSS) to powder-form PVDF, followed by casting and subsequent solvent evaporation. The obtained submicron structure of membrane through solvent evaporation led to the arrangement of ionic channels proving increasing proton conductivity with the increase in graft level. In addition, a temperature above melting point of PVDF was used for solvent evaporation to allow melted PVDF to fill the formed pores, providing denser structure resulting in improved mechanical properties of the membranes. SSS grafting to PVDF powder was verified by NMR spectroscopy, and resultant membranes were characterized for proton conductivity, water up-take, morphology, mechanical and thermal properties, and fuel cell performance. According to preliminary tests, proton conductivities which were observed to increase with graft level were found to be around 70 mS cm(2) at 35% graft level. Thus, this led to a promising power density of 250 mW/cm(2) at 650 mA/cm(2).Review Citation - WoS: 21Citation - Scopus: 34Principles of Reverse Electrodialysis and Development of Integrated-Based System for Power Generation and Water Treatment: a Review(Walter de Gruyter Gmbh, 2022) Othman, Nur Hidayati; Kabay, Nalan; Guler, EnverReverse electrodialysis (RED) is among the evolving membrane-based processes available for energy harvesting by mixing water with different salinities. The chemical potential difference causes the movement of cations and anions in opposite directions that can then be transformed into the electrical current at the electrodes by redox reactions. Although several works have shown the possibilities of achieving high power densities through the RED system, the transformation to the industrial-scale stacks remains a challenge particularly in understanding the correlation between ion-exchange membranes (IEMs) and the operating conditions. This work provides an overview of the RED system including its development and modifications of IEM utilized in the RED system. The effects of modified membranes particularly on the psychochemical properties of the membranes and the effects of numerous operating variables are discussed. The prospects of combining the RED system with other technologies such as reverse osmosis, electrodialysis, membrane distillation, heat engine, microbial fuel cell), and flow battery have been summarized based on open-loop and closed-loop configurations. This review attempts to explain the development and prospect of RED technology for salinity gradient power production and further elucidate the integrated RED system as a promising way to harvest energy while reducing the impact of liquid waste disposal on the environment.Article Citation - Scopus: 2Effect of Geothermal Water Composition and Pretreatment on the Product Water for Boron-Sensitive Crops(Turkish Energy Nuclear and Mining Research Institute, 2021) Güler, EnverThe membrane filtration is an effective way to produce water for human consumption, industrial use, or irrigation purpose. In this study, a brackish water reverse osmosis (BWRO) membrane was practically investigated to obtain irrigation water from geothermal water. The quality of the produced water was analyzed to understand the potential in agricultural use for boron-sensitive crops. The effects of the feed solution composition and pretreatment by microfiltration were studied. Results showed that the ionic content was effective in reduction of permeate flux. However, the rejections of salt and silica did not change significantly by the change in the feed water composition and they were successfully removed from the geothermal water by more than 95% rejection. Pretreatment of the geothermal water with a microfiltration (MF) membrane having a pore-size of 0.8 μm provided higher flux than the one having a pore size of 5 μm. The higher rejections of boron were only achieved with increased pH in the pretreatment. The pH of 9.5 in the geothermal water provided a rejection of boron as 75% with a permeate boron concentration of 2.4 mg/L when 15 bar of operating pressure was employed. This level of boron concentration in the irrigation water was found to be allowable only for some boron resistant crops (e.g. beans, lettuce, onion) and semi-sensitive crops (e.g. sunflower, potato, tomato).Book Part Application of Nanofiltration for Reclamation and Reuse of Wastewater and Spent Geothermal Fluid(CRC Press, 2023) Jarma,Y.A.; Cihanoğlu,A.; Güler,E.; Tomaszewska,B.; Kasztelewicz,A.; Baba,A.; Kabay,N.After the extraction of energy from the geothermal fluid, the consumed geothermal water can be considered as a potential water resource for agricultural and industrial purposes. The used geothermal water can also be used as a source of drinking water, which could reduce the pressure on the current clean water resources. On the other hand, geothermal fluids brought to the surface need to be treated in the most economical way before discharge into the surface environment or aquifer. Several processes have shown promising results for the treatment of geothermal water. Membrane processes such as nanofiltration (NF) and reverse osmosis (RO) can be considered as a technology for obtaining good quality irrigation water from geothermal water. This chapter summarizes the application of NF for the recovery and reuse of wastewater and spent geothermal water. © 2024 selection and editorial matter, Abdul Wahab Mohammad, Teow Yeit Haan and Nidal Hidal; individual chapters, the contributors.Master Thesis Metanolden Formaldehyde Üretiminin Optimizasyonu(2018) Idres, Ruwıda Ab.m.; Güler, EnverFormaldehit, yapı malzemelerinin ayrıca fenol formaldehit gibi polimerik reçinelerin üretimini içeren birçok kimya endüstrisinde oldukça önemli kabul edilen kimyasallardan birisidir. Bu projenin başlıca amacı, kimya mühendisliği bakış açısından, belirli çalışma koşulları altında ve spesifik kapasite dahilinde formaldehit üreten entegre reaktör tasarımı üzerinde çalışma yapmak ve metanolden formaldehit üretim sürecini incelemektir. Bu projede, yılda 120000 ton seviyesinde formaldehit üretimi ve bunda en az ağırlıkça %99.1 formaldehit ve %99.1 azot üretimini sağlanmaktadır. Üretimde metal oksit işlemi kullanılmıştır. Bu projede, süreç Aspen Plus V9 yazılımı kullanılarak simüle ve optimize edilmiştir. Başlıca odak noktası, üretim sürecinde reaktörün tasarımı ve geliştirilmesidir. Sıcaklık, basınç, boruların sayısı, reaktördeki çapı ve uzunluğu da incelenmiştir. Bu projede, formaldehit, katalitik buhar-fazlı oksidasyon reaksiyonu ile üretilmiştir.
