Yazar "Bayramol, Derman Vatansever" seçeneğine göre listele

Listeleniyor 1 - 7 / 7
  • [ X ]
    Öğe
    COMPARATIVE INVESTIGATION OF Fe3O4, Fe3O4@HA AND Fe3O4@AC NANOPARTICLES ON DYES ADSORPTION
    (Gh Asachi Technical Univ Iasi, 2022) Kaykioglu, Gul; Yildiz, Aylin; Bayramol, Derman Vatansever; Dalmis, Ibrahim Savas; Miral, Iskender Tamer
    In this study, the removal of Methylene Blue (MB) and Methyl Orange (MO) dyestuffs from aqueous solutions via adsorption by using magnetic nanoparticles of Fe3O4, Fe3O4@HA and Fe3O4@AC synthesized under laboratory conditions was investigated. The synthesized magnetic nanoparticles were characterized by SEM, EDX, XRD, BET surface area, FTIR, average pore diameter and particle size distribution analysis. When Fe3O4, Fe3O4@HA and Fe3O4@AC were used as adsorbents, the optimum pH values for MB were determined as pH 11, pH 9 and pH 7, respectively, and pH 6, pH 4 and pH 4 for MO, respectively. At the determined optimum pH values, Fe3O4, Fe3O4@HA and Fe3O4@AC were determined to be 4.2 mg/g, 4.8 mg/g and 8 mg/g for MB at an initial dye concentration of 10 mg/L, while Fe3O4, Fe3O4@HA and Fe3O4@AC were determined to be 3 mg/g, 1.6 mg/g and 4.5 mg/g for MO, respectively. It was found to be compatible with the Freundlich isotherm and pseudo second-order model of all adsorption experiments. This study showed that Fe3O4@HA, synthesized by binding HA to Fe3O4, and Fe3O4@AC, synthesized, and carbonized by pyrolysis, magnetic nanoparticles can be used as a good alternative adsorbent for removing hazardous dyes from wastewater due to their good cleaning efficiency as well as easy synthesis and regeneration.
  • [ X ]
    Öğe
    From industrial waste to carbon-containing nanocomposites to obtain multifunctional properties for industrial applications
    (Elsevier, 2022) Yildiz, Aylin; Acikbas, Burcu; Atav, Riza; Dalmis, Ibrahim Savas; Bayramol, Derman Vatansever; Bugdayci, Burhan
    Helianthus annuus (sunflower) and Brassica napus (canola) are two important crops for vegetable oil industry, but their residues after harvesting cause agricultural waste. In this study, agricultural wastes of sunflower and canola were utilized as activated carbon (AC) after pyrolysing the wastes at 450 degrees C and activating with HNO3 at 90 degrees C. Obtained AC was then used to produce Fe3O4@AC nanocomposites and beta-cyclodextrin(CD):Fe3O4@AC complex structures. Structural, morphological, spectroscopic, and thermal characteristic properties of the obtained nanocomposites and complex structures were examined by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Fourier transform infrared (FTIR) and Thermogravimetric Analysis (TGA), respectively. Produced nanocomposites and complex structures were coated onto cotton woven fabrics which were then tested for their UV protection, flame retardant and antibacterial activity. The test results of the coated fabrics and the control (uncoated cotton fabric) samples showed that Fe3O4@AC and CD:Fe3O4@AC coated fabrics showed significant UV protection, flame retardancy and antibacterial properties. Thus, the effects which would normally be obtained with 3 different finishing chemicals, each of which causes individual waste load, were achieved with a single chemical recycled from a waste. This work is critical in terms of waste management and providing a cleaner production alternative in the field of textile finishing.
  • [ X ]
    Öğe
    Inclusion complexes of ?-cyclodextrıne with Fe3O4@HA@Ag Part II: Their use in the production of PVP nanowebs
    (Inst Natl Cercetare-Dezvoltare Textile Pielarie-Bucuresti, 2023) Atav, Riza; Agirgan, Ahmet Ozgur; Yildiz, Aylin; Bayramol, Derman Vatansever; Erguenay, Ugur
    Humic acid is a material formed as a result of the degradation of animal and plant wastes, it cleans heavy metals which are industrial wastes that threaten both the environment and human health. In part I of this study, the Fe3O4@HA@Ag compound was synthesized, its inclusion complex with beta-cyclodextrin was prepared by using the kneading technique and obtained inclusion complexes were characterized. In this study, part II, nanowebs were formed from the inclusion of complex-containing polymer solution via the electrospinning method. The electrospinning solution consisted of beta-CD:Fe3O4@HA@Ag inclusion complexes at the rate of 5%, 7.5% and 10% by weight and the polyvinylpyrrolidone (PVP) polymer as the carrier. The obtained nanoweb material was characterized by instrumental methods such as SEM, FTIR, XRD, and TGA. The results obtained from FTIR, XRD and TGA revealed that beta-CD:Fe3O4@HA@Ag inclusion complexes containing nanowebs were successfully produced. The uniform fibre formation was detected from SEM images. The average fibre diameter of 5%, 7.5% and 10% beta-CD:Fe3O4@HA@Ag inclusion complex containing nanowebs were measured to be 612.5 nm, 610.8 nm and 431.2 nm, respectively.
  • Küçük Resim
    Öğe
    Preparation of Fe3O4@HA@Ag nanocomposites, production of nanofiber with PVP and its characterization
    (2021) Yıldız, Aylin; Demir, Cumali; Bayramol, Derman Vatansever; Ağırgan, Ahmet Özgür
    Magnetite (Fe3O4), Humic Acid (HA) and Silver (Ag) are materials with important properties. Synthesizing a single material which will have all the properties of these materials can provide significant advantages for some application areas. In this study, synthesized Fe3O4@HA@Ag was doped into poly(vinyl pyrrolidone) (PVP), in weight ratios of 5%, 7.5% and 10%, and nanofiber production was carried out by electrospinning method. Structural properties of nanofiber structures were investigated by X-ray Diffraction (XRD), morphological properties by Scanning Electron Microscope (SEM), spectroscopic and thermal characterizations by Fourier transform infrared (FTIR) and Thermogravimetric Analysis (TGA). When the analysis results of nanofibers were evaluated, it was determined that Fe3O4@HA@Ag doped PVP nanofibers were successfully produced.
  • [ X ]
    Öğe
    Preparation of silver cyclohexane di carboxylate: ?-cyclodextrin inclusion complexes and their use in the production of Poly(vinyl alcohol) nanowebs
    (Chamber of Textile Engineers, 2020) Atav, Rıza; Yıldız, Aylin; Bayramol, Derman Vatansever; Ağırgan, Ahmet Özgür; Ergünay, Uğur
    In this study, guest:host inclusion complexes of silver cyclohexane di carboxylate (Ag-CdC) with ß-cyclodextrin were prepared by kneading and physical mixing techniques, and analyzed via Fourier transformed infrared spectroscopy (FTIR) and thermogravimetric analyser (TGA). The 1:1 and 1:2 stoichiometry of the guest:host were prepared. Obtained FTIR and TGA results showed that formation of silver cyclohexane di carboxylate (Ag-CdC): ß-cyclodextrin (ß-CD) inclusion complexes occurred at a mass ratio of both 1:1 and 1:2. Furthermore, these prepared inclusion complexes were doped in poly(vinyl alcohol) nanofibers during electrospinning process for obtaining nanowebs. The formation of nanowebs were investigated with scanning electron microscopy (SEM). Besides, FTIR and TGA analysis were also carried out. Results showed that both inclusion complex preparation and inclusion complex added PVA nanowebs production were successful. © 2020. Journal of Textiles and Engineer. All Rights Reserved.
  • [ X ]
    Öğe
    Preparation of Silver Cyclohexane di Carboxylate: ?-cyclodextrin Inclusion Complexes and Their Use in the Production of Poly(vinyl alcohol) Nanowebs
    (TMMOB Tekstil Mühendisleri Odası, 2020) Atav, Rıza; Yıldız, Aylin; Bayramol, Derman Vatansever; Ağırgan, Ahmet Özgür; Ergünay, Uğur
    In this study, guest:host inclusion complexes of silver cyclohexane di carboxylate (Ag-CdC) with ?-cyclodextrin were prepared by kneading and physical mixing techniques, and analyzed via Fourier transformed infrared spectroscopy (FTIR) and thermogravimetric analyser (TGA). The 1:1 and 1:2 stoichiometry of the guest:host were prepared. Obtained FTIR and TGA results showed that formation of silver cyclohexane di carboxylate (Ag-CdC): ?-cyclodextrin (?-CD) inclusion complexes occurred at a mass ratio of both 1:1 and 1:2. Furthermore, these prepared inclusion complexes were doped in poly(vinyl alcohol) nanofibers during electrospinning process for obtaining nanowebs. The formation of nanowebs were investigated with scanning electron microscopy (SEM). Besides, FTIR and TGA analysis were also carried out. Results showed that both inclusion complex preparation and inclusion complex added PVA nanowebs production were successful.
  • [ X ]
    Öğe
    Synthesis and characterization of Fe3O4@Cs@Ag nanocomposite and its use in the production of magnetic and antibacterial nanofibrous membranes
    (Elsevier, 2020) Yıldız, Aylin; Bayramol, Derman Vatansever; Atav, Rıza; Ağırgan, A. Özgür; Kurç, Mine Aydın; Ergünay, Uğur; Hadimani, Ravi L.
    Electrospinning is a promising technique to produce polymeric as well as metal oxide nanofibers in diverse domains. In this work, different weight ratios (5%, 7.5% and 10%) of Fe3O4@Cs@Ag magnetic nanoparticles were added in PVP (polyvinylpyrrolidone) polymer and fabricated via electrospinning method to produce magnetic nanofibers (MNFs). Structural, magnetic, morphological, spectroscopic and thermal properties of produced nanofibers were characterized. Furtheremore, antibacterial effects of Fe3O4@Cs@Ag nanofibrous membrane was investigated. Obtained SEM images showed that produced nanofibers were uniform and defect free. Moreover, crystallinity and magnetic moment of fibers was tested by using X-ray diffraction and a vibrating sample magnetometer. The results showed that produced nanofibrous membranes exhibited good antibacterial activity versus Staphylococcus aureus, Bacillus subtilis, Enterococcus faecalis, Escherichia coli, Proteus mirabilis and Pseudomonas aeruginosa.