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Adsorption of methylene blue from aqueous solution using poly(2-acrylamido-2-methyl-1-propanesulfonic acid-co-2-hydroxyethyl methacrylate) hydrogel crosslinked by activated carbon
(Taylor and Francis Ltd., 2023) Ilgın, Pınar; Önder, Alper; Kıvanç, Mehmet Rıza; Özay, Hava; Özay, Özgür
This study aimed to develop an environmentally friendly, inexpensive, and efficient adsorbent for removing methylene blue (MB) dye from wastewater using a three-dimensional porous poly(2-Acrylamido-2-methyl-1-propanesulfonic acid-co-2-Hydroxyethyl Methacrylate), p(AMPS-co-HEMA) composite hydrogel crosslinked with vinyl-functionalized activated carbon (VAC). The surface morphology and chemical structure of the crosslinker were characterized using transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET) surface area analysis, X-ray spectroscopy (XRD) and Fourier transform-infrared spectroscopy (FT-IR) instruments. The surface morphology, chemical structure and thermal properties of the hydrogel were also characterized using scanning electron microscopy (SEM), FT-IR and thermogravimetric analyzers (TGA). Experimental parameters affecting the adsorption behavior, such as initial dye concentration, time, dosage, pH, and temperature, were systematically investigated. Hydrogel achieved optimal MB removal efficiency (69.53%) at an initial MB concentration of 250 mg/L (1 mg/mL, pH not adjusted) over 24 h. Adsorption kinetics, isotherm, thermodynamic studies, and reusability were investigated. Experimental adsorption isotherm and kinetic data followed the Langmuir model and pseudo-second-order kinetics with a maximum adsorption capacity of 284.90 mg/g hydrogel at 293 K. Thermodynamic findings proved the spontaneity and endothermic behavior of the adsorption process. After 5 adsorption-desorption cycles, the adsorption capacity of the composite hydrogel decreased by only 7.51 mg/g compared to the initial adsorption capacity.
Anticancer, Antioxidant, Antimicrobial Activities, and HPLC Analysis of Alcoholic Extracts of Parthenocissus quinquefolia L. Plant Collected from Çanakkale
(2024) Önder, Ferah Cömert; Kalın, Sevil; Maraba, Özlem; Önder, Alper; Ilgın, Pınar; Karabacak, Ersin
This study aimed to contribute to revealing the health effects of the Parthenocissus quinquefolia L. (PQ) plant by examining the biological activities of various extracts of the plant. An ethnobotanical important medicinal plant, PQ belongs to the Vine family (Vitaceae) and is known for its medicinal uses. Herein, fruit and leaf alcoholic extracts of the plant exhibited anticancer activity on triple negative breast cancer (TNBC) cell lines, estrogen receptor positive (ER+) (MCF-7), and human colon adenocarcinoma (HT-29) cancer cell lines. Furthermore, fruit methanol extracts displayed strong radical scavenging activity with low IC50 values such as 0.51 mg/mL, 0.80 mg/mL, 0.84 mg/mL, and 1.45 mg/mL. The highest TEAC values (18.72 mM Trolox/mg, 9.90 mM Trolox/mg, and 8.41 mM Trolox/mg) were calculated for the extracts of red leaves. The antifungal activity was determined against Candida albicans as fungal pathogen. The cell apoptosis with methanol extract was obtained between 20 µg/mL and 70 µg/mL for 48 h and 72 h treatments by Hoechst 33258 staining of nuclei under a fluorescence microscopy. HPLC analysis was performed for methanol extracts to determine major bioactive components. Consequently, this plant extracts may guide to new strategies and may be uses in medicinal applications for further investigations.
Bazı dört uçlu ligantların Cu (II), Fe (II) ve Ni (II) komplekslerinin termal özellikleri
(Çanakkale Onsekiz Mart Üniversitesi, 2011) Önder, Alper; Baran, Yakup
Yapısında kükürt, azot ve oksijen donör atomları içeren Schiff bazları geçiş metal iyonları ile şelat kompleksleri oluşturur. Schiff bazlarının Cu (II), Ni (II) ve Fe (II) ile koordinasyonu kararlı kompleksler oluşturur. N3O, N2O2, N3S ve N4 donör atomu içeren bazı Schiff bazları hazırlandı ve yapıları GC-MS, FT-IR, 1H ve 13C NMR verileri ile belirlendi. Bu ligantların Cu (II), Ni (II) ve Fe (II) kompleksleri hazırlandı ve yapıları FT-IR, manyetik özellikleri ve termal analiz (TG-DTA) çalışmaları ile belirlendi. Bu komplekslerin termal incelenmesinde ilk basamakta dehidrasyonun gerçekleştiği daha sonra karşı iyon ve ligandın ortamdan ayrıldığı belirlendi. Termal kararlılığa merkez atomunun etkisi, donör atomların, ligantların yapısı ve kompleksin koordinasyon sayısının etkisi tartışıldı.
Effects of Pleurotus Eryngii (DC.) Quél. Mushroom Extracts on Cell Proliferation in Breast and Colon Cancer Cell Lines
(2024) Önder, Ferah Cömert; Davutlar, Gülce; Önder, Alper; Allı, Hakan; Ay, Mehmet
This study was aimed to collect Pleurotus eryngii (DC.) Quél. edible/medicinal mushroom from Çanakkale/Kumkale and to evaluate the antiproliferative effects of alcoholic extracts on breast and colon cancer cell lines. For this purpose, the Soxhlet method prepared methanol and ethanol:H2O (70:30) extracts by gradually increasing solvent polarities. Then, breast (MDA-MB-231, BT-549, BT-20, MCF-7) and colon (HT-29) cancer cell lines were treated with the extracts in increasing concentrations (0.05-0.5 mg/mL) for 48 h. In conclusion, methanol and aqueous ethanol extracts exhibited significant antiproliferative effects in cancer cell lines, according to the MTT assay. The cell viability in the triple-negative breast cancer (TNBC) MDA-MB-231 cell line was highly decreased by methanol extract at a very low concentration (0.1 mg/mL). Furthermore, methanol extract at 0.3 mg/mL reduced the percentage of cell viability in the HT-29 cell line. Aqueous ethanol extract showed antiproliferative activity in breast and colon cancer cell lines at 0.25 mg/mL concentration for 48 h applications. In addition, some bioactive components such as 4-hydroxy flavone, chrysin, and tannic acid of aqueous ethanol extract have been determined by High-Performance Liquid Chromatography (HPLC) analysis. As a result, this study may increase interest in the studies on the anti-cancer activities and the mechanisms of P. eryngii mushroom.
Hidrojen üretimi için çeşitli metal kompozitlerin geliştirilmesi
(Çanakkale Onsekiz Mart Üniversitesi, 2016) Önder, Alper; Özay, Özgür
Bu çalışmada, hidrojen depo materyali olarak kullanılan kimyasal maddelerden, hidrojen üretiminde kullanılmak üzere çeşitli katalizör destek malzemeleri (Uçucu kül, Monmorillonit KSF ve Dowex-50 reçine) ve Co(II), Cu(II) ve Ni(II) geçiş metalleri kullanılarak yeni kompozit katalizörler hazırlanmıştır. Elde edilen kompozitlerin, X-Işınları floresans spektrometresi (XRF), Taramalı elektron mikroskobu (SEM) ve ICP–Optik emisyon spektroskopisi (ICP–OES) kullanılarak karakterizasyonu yapılmıştır. Hidrojen depo materyali olarak kullanılan etilendiamin bisboren (EDAB) sentezlenerek, Fourier dönüşümlü kızılötesi spektroskopisi (FT-IR) ve erime noktası tayin cihazı ile karakterizasyonu yapılmıştır. Hazırlanan metal kompozitlerin toplam frekans değeri (TOF), yeniden kullanılabilirliği hidrojen depolayıcı bileşiklerin (EDAB ve NaBH4), hidrolizi ile belirlenmiştir. Hidrojen üretimi, çeşitli bilinen bileşiklerden (EDAB ve NaBH4), hazırlanan katalizörler ile sağlanmıştır. Hidrojen üretiminde katalizör miktarı, tepken derişimi, katalizör türü, destek materyal türü ve sıcaklık etkileri ve farklı sıcaklıklardaki hız sabitleri hesaplanarak, aktivasyon parametreleri (Ea, ?H# ve ?S#) belirlenmiştir.
Highly efficient removal of methyl orange from aqueous media by amine functional cyclotriphosphazene submicrospheres as reusable column packing material
(Elsevier B.V., 2021) Önder, Alper; Özay, Hava
Polyphosphazenes have an important place in material science because they allow functional diversity to be realized easily. In this study, for the first time, synthesis of cyclomatrix-type poly-(cyclotriphosphazene-co-4-(aminomethyl)-1,8-octanediamine) (Phz-AO) particles including different surface features and dimensions have been reported using different stoichiometric ratios of hexachlorocyclotriphosphazene and 4-(aminomethyl)-1,8-octanediamine. The use of Phz-AO (1:2) submicroparticles with spherical form and average dimension of 647.82 ± 22.23 nm as an adsorbent was researched for methyl orange (MO) anionic azo dye. Submicrospheres had significant potential for adsorption of negative charged MO and maximum adsorption capacity of 1244.7 mg.g − 1. The submicrospheres displayed high adsorption potential at pH ≤6 conditions thanks to their surface amine groups. The maximum adsorption capacity in synthetic textile wastewater was 912.75 mg.g−1 as experimental. While the adsorption kinetics had the pseudo second order model, the most suitable model for adsorption was the Langmuir isotherm. The thermodynamic parameters for MO adsorption with submicrospheres were 10.02 ± 1.81 kj.mol−1 for ΔH°, 61.08 ± 5.74 j.mol−1.K−1 for ΔS° and ΔG° (kj.mol−1)<0. In light of all data obtained, the Phz-AO (1:2) submicrospheres which can be easily prepared with a single-step reaction are expected to be a remarkable member of the super adsorbent material family.
Magnetic hydrogel syntheses and their applications in the environment for the removal of toxic metal ions
(Amer Chemical Soc, 2009) Özay, Özgür; Önder, Alper; Şahan, Tekin; Aktaş, Nahit; Baran, Yakup; John, Vijay T.; Şahiner, Nurettin
[Anstract Not Available]
Nitro Compounds Inhibit Breast Cancer Cell Proliferation, Migration, and Colony Formation: Molecular Docking, Molecular Dynamics Simulations and Pharmacological Properties
(John Wiley and Sons Inc, 2023) Cömert Önder, Ferah; Şahin, Nebahat; Davutlar, Gülce; Önder, Alper; Ay, Mehmet
In this study, the concept of combined in vitro and in silico studies were utilized by using some synthesized nitro bearing compounds. The anticancer activities of the studied compounds were performed by using colony formation analysis, cell cytotoxicity, and migration. Nitro group containing two compounds were analyzed using Hoechst staining to indicate the morphological changes on the nuclei of cancer cells under fluorescence microscopy. Scanning electron microscopy (SEM) analysis was performed with N,N-dibutyl-nitro-substituted compound. Nitro containing anticancer agents were shown the inhibition at 1.5 μM and 2 μM concentrations, and nuclear apoptosis was detected. In addition, cell-to-cell interaction on MDA-MB-231 cells was broken and observed morphologic changes following the treatment with N,N-dibutyl-nitro-substituted compound at the effective doses. In general, the other nitro compounds showed cell cytotoxicity at 5 μM, 10 μM, and 20 μM. Two hits as anticancer agents were determined as potential interleukin-1 receptor-associated kinase 1 (IRAK1) and interleukin-1 receptor-associated kinase 4 (IRAK4) inhibitor candidates. Molecular docking and molecular dynamics (MD) simulations studies will provide that the binding patterns with specific residues such as Met265, Tyr284 of the IRAK family members, and these will contribute to further in vitro and in vivo studies for targeted breast cancer therapy.
Preparation of Cationic Composite Hydrogel Improved by Activated Carbon and Its Use in Removal of Anionic Dye
(2023) Önder, Alper
Water-insoluble p(AETAC)/AC composite hydrogels containing quaternary ammonium were prepared by free-radical polymerisation method with [2-(Acryloyloxy)ethyl]trimethylammonium chloride (AETAC) and activated carbon (AC). The composite hydrogel was characterized by Fourier Transform Infrared Spectroscopy (FT-IR), Thermogravimetric analysis (TGA), X-Ray Diffraction (XRD), and Scanning Electron Microscopy (SEM) methods. In addition, the swelling behavior of p(AETAC)/AC composite hydrogels containing 50 mg, 75 mg, 100 mg, and 150 mg AC in deionized water was investigated. The swelling capacity of the p(AETAC)/AC75 composite hydrogel containing 75 mg AC in various waters was determined. Initial dye concentration, contact time, pH of dye solution, amount of adsorbent, and temperature parameters affecting MO adsorption of p(AETAC)/AC75 composite hydrogel were investigated. The obtained adsorption data agree with the Langmuir isotherm model and the PFO kinetic model. It was determined that the maximum adsorption ability of p(AETAC)/AC75 composite hydrogel according to Langmuir isotherm was 909.09 mg/g. ?H° and ?S° values for the adsorption of MO dye-stuff of p(AETAC)/AC75 composite hydrogel were calculated as 22.25 ± 1.43 and 85.40 ± 4.60, respectively. In addition, the value of ?G° less than zero at four different temperatures indicates that the dye adsorption is spontaneous. According to all the data obtained, p(AETAC)/AC75 composite hydrogel can be considered a promising candidate for the removal of anionic dyestuffs from water.
Preparation of composite hydrogels containing fly ash as low-cost adsorbent material and its use in dye adsorption
(Springer Science and Business Media Deutschland GmbH, 2022) Önder, Alper; Ilgın, Pınar; Özay, Hava; Özay, Özgür
Abstract: Recycling industrial wastes is necessary for the economy and the environment. Additionally, it is important to develop high-efficiency adsorbents to prevent severe water pollution caused by wastewater containing dye agents. Here, poly(2-acrylamido-2-methylpropane sulfonic acid)-fly ash composite hydrogel was synthesized with a variety of fly ash proportions with the radical polymerization method. The synthesized composite hydrogel was used for adsorption of methylene blue and methyl orange dyes from water containing dye agents. A variety of parameters such as initial dye concentration, solution pH, anion effects, temperature, contact time and adsorbent amount were investigated for optimization of the adsorption process. The poly(2-acrylamido-2-methylpropane sulfonic acid)-fly ash composite hydrogel was determined to be an effective adsorbent to remove both the cationic dye methylene blue (1438.68 mg g−1) and the anionic dye methyl orange (646.54 mg g−1). Experimental adsorption data were assessed with a variety of isotherm and kinetic models. It was determined that the adsorption of both dye molecules abided by the pseudo-second-order kinetic model. The thermodynamic parameters were determined as ΔH° = − 15.77 ± 5.22 kJ mol−1, ΔS = − 45.05 ± 16.42 J mol−1 K−1 and ΔG° < 0 for MB, ΔH° = − 20.13 ± 4.83 kJ mol−1, ΔS = − 72.87 ± 15.20 J mol−1 K−1 and ΔG° > 0 for MO. In conclusion, a material was synthesized that can be used as a single adsorbent composite material for both anionic and cationic dyes. In addition to the perfect adsorption capacity of this material, it offers reusability and a broad area of application for a variety of dye agents.
Siklotrifosfazen halkası içeren bazı polimerik yapıların sentezi ve uygulamaları
(Çanakkale Onsekiz Mart Üniversitesi, 2021) Önder, Alper; Özay, Hava
Enerji, sağlık ve çevrenin önemi göz önüne alındığında bu üç alanda da yararlı olacak polimerik yapıların geliştirilmesinin önemi gün geçtikçe artmaktadır. Bu amaçla, tez çalışmasında hekzaklorosiklotrifosfazen ile tannik asit, 4-(aminometil)-1,8-oktandiamin ve 1,4-Bis(3-aminopropil)piperazin'in çözücü ortamında ultrasonik banyoda çapraz bağlanarak polimerleşmesiyle sırasıyla, Phz-TA, Phz-AO ve Phz-BAP polimerik malzemeleri sentezlendi. Sentezlenen polimerik malzemelerin FT-IR, SEM-EDX, XPS, XRD ve TEM gibi çeşitli analiz metotları ile karakterizasyonları yapıldı. Phz-TA (4:1) nanokürelerinin yüksek antioksidan özellik gösterdiği belirlendi ve bu nanoküreler model ilaç Rhodamin 6G'nin salımında kullanıldı. Çevre alanında boya adsorpsiyonunda kullanılmak için sentezlenen Phz-AO (1:2) submikroküreleri anyonik azo boyar madde metil turuncusu için çeşitli adsorpsiyon koşullarında adsorban olarak kullanıldı. Diğer bir polimerik malzeme Phz-BAP (1:3) nanoküreleri ile gelecek için önemli enerji kaynağı olarak görülen hidrojenin katalitik üretimi için Phz-BAP@Cu katalizör sistemi hazırlandı. Phz-BAP@Cu'ın EDAB'ın katalitik hidrolizinden hidrojen üretiminde önemli bir potansiyele sahip olduğu belirlendi. Sonuç olarak, literatüre sağlık, çevre ve enerji alanlarında kullanılabilir siklotrifosfazen halkası içeren polimerik yapılar kazandırıldı.
Synthesis and characterization of biodegradable and antioxidant phosphazene-tannic acid nanospheres and their utilization as drug carrier material
(Elsevier Ltd, 2021) Önder, Alper; Özay, Hava
In this study, hexachlorocyclotriphosphazene (HCCP) and tannic acid (TA) were used at different stoichiometric ratios to synthesize cyclomatrix-type polymeric materials with different surface features and dimensions. Using different reactive ratios, the structure and surface functional groups of the synthesized polymeric particles were explained using Fourier-Transform Infrared Spectroscopic (FTIR), Scanning Electron Microscope (SEM), Energy-dispersive X-ray spectroscopy (EDX), X-ray Photoelectron Spectroscopy (XPS) and Thermogravimetric (TG) analysis techniques. With morphologically fully spherical structure and mean 234.82 ± 49.37 nm dimensions, Phz-TA (4:1) nanospheres were researched for in vitro biodegradability, antioxidant features, and usability as a drug release system. In vitro biodegradability of Phz-TA (4:1) nanospheres was investigated at pH = 7.0 and pH = 1.2. Determined to degrade in 8–10 h at these pH values, nanospheres were used for releasing of Rhodamine 6G as a model drug. Due to the rich phenolic structure of the contained tannic acid units, nanospheres were determined to simultaneously have antioxidant features. Thus, this study determined that Phz-TA nanospheres with in vitro biodegradability and antioxidant features are promising polymeric materials for use as a potential drug-carrier in the future.
Synthesis and characterization of cyclomatrix polyphosphazenes framework nanospheres-supported Cu0 nanocatalyst and its use in hydrogen production from ethylenediamine bisborane
(Elsevier Ltd, 2024) Önder, Alper; Özay, Hava
In this study, Cp-BAP3@Cu catalyst system containing Cu0 nanoparticles with an average size of 4.23 ± 1.97 nm was prepared by using Cp-BAP nanospheres containing cyclotriphosphazene with an average size of 306.31 ± 61.54 nm as support material. Characterizations of the synthesized polymeric materials and catalyst system were carried out by various analysis techniques. The Cp-BAP3@Cu catalyst system was used for the catalytic hydrolysis reaction of ethylenediamine bisborane (EDAB). For the hydrolysis reaction of EDAB, Cp-BAP3@Cu had a turnover frequency of 1539 mol H2/mol Cu0. h at 30 °C. The activation parameters for the hydrolysis reaction were Ea = 47.36 ± 0.52 kJ/mol, ΔH0 = 44.73 ± 0.52 kJ/mol and ΔS0 = −153.81 ± 6.14 J/mol.K. The Cp-BAP3@Cu catalyst system has an important catalytic activity in the formation of H2 from the hydrolysis of EDAB.
Synthesis of p(HEMA-co-AETAC) nanocomposite hydrogel with vinyl-function montmorillonite nanoparticles and effective removal of methyl orange from aqueous solution
(Taylor and Francis Ltd., 2023) Önder, Alper; Ilgın, Pınar; Özay, Hava; Özay, Özgür
It has become crucial to develop new adsorbents to remove toxic dye wastes from wastewater to protect our existing aquatic ecosystem. Here, to remove methyl orange azo dye from aqueous solutions, a new p(HEMA-co-AETAC)/VMt nanocomposite hydrogel was prepared by using 2-hydroxyethyl methacrylate and [2-(acryloyloxy)ethyl]trimethylammonium chloride monomers using vinyl-based montmorillonite crosslinker. Obtained new types of crosslinker and nanocomposite hydrogels have been characterized by various analysis methods. In addition, the effects of crosslinker amount, monomer amount and pH on the swelling behavior of nanocomposite hydrogel were investigated. The effects of essential parameters such as contact time, initial dye concentration, pH effect of the solution, adsorbent amount, and temperature on adsorption were evaluated. It was determined that there was no significant change in the adsorption ability of the nanocomposite hydrogel in the pH range of 3–10. Experimental results showed that the Langmuir isotherm model fit better, and the calculated maximum adsorption capacity was 961.54 mg/g. In addition, it was determined that vinyl-based montmorillonite used as a crosslinker supported MO adsorption. p(HEMA-co-AETAC)/VMt nanocomposite hydrogel may be a new type of adsorbent to remove toxic synthetic dye residues from aqueous media.
Synthesis, characterization, and in vitro drug release properties of AuNPs/p(AETAC-co-VI)/Q nanocomposite hydrogels
(Springer Science and Business Media Deutschland GmbH, 2021) Durmuş, Seçil; Yılmaz, Betül; Kıvanç, Mehmet Rıza; Önder, Alper; Ilgın, Pınar; Özay, Hava; Özay, Özgür
In this study, the cationic monomer [2-(acryloyloxy)ethyl]trimethylammonium chloride solution (AETAC) and vinyl imidazole (VI) were used with the free radical polymerization technique, which is a simple and rapid synthesis method, to synthesize p(AETAC-co-VI) hydrogels. To increase the density of cationic charge on the hydrogel, it underwent the protonation process with HCl. The obtained p(AETAC-co-VI)/Q hydrogel was modified with Au nanoparticles to increase bactericidal effect to obtain the AuNPs/p(AETAC-co-VI)/Q nanocomposite hydrogel. The morphology and chemical structure of the hydrogels were characterized with SEM and FTIR. Additionally, the swelling capabilities were tested in different pH media. XRD and TEM confirmed the formation of the nanocomposite hydrogel. The antibacterial activity of the hydrogels was tested against E. coli and S. aureus, and controlled release implementations were completed with sodium diclofenac (NaDc) drug. The NaDc drug release profiles of the hydrogels were researched using the Korsmeyer–Peppas model at 37 °C in different simulated buffer (pH 6.0, 7.2, and 8.0) solutions. It was found that both the hydrogel and nanocomposite hydrogel followed non-Fickian diffusion mechanisms as free release mechanism. Here, the maximum drug release efficacy was found to be 97%, and drug release was more rapid in basic media when release media were compared. The AuNPs/p(AETAC-co-VI)/Q nanocomposite hydrogels produced in this study with advanced antibacterial features were suitable for recommendation as good carriers for in vitro release of NaDc drugs in areas like the biomedical and pharmaceutical industries.

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