Yazar "Bayrak, Melike" seçeneğine göre listele

Listeleniyor 1 - 6 / 6
  • Küçük Resim
    Öğe
    Detection of Mercury(ii) in Aqueous Media Using Bodipy-Functionalized Magnetic Fluorescent Sporopollenin
    (Royal Soc Chemistry, 2024) Bayrak, Melike; Çimen, Aysel; Bilgiç, Ali
    Pollution from heavy metal ions has become a major issue worldwide. Water pollution, particularly with heavy metals like mercury, is a global problem. Developing environmentally friendly, low-cost, high-efficiency, sensitive, and selective sensors for the detection of mercury(ii) ions in aqueous environments has attracted great interest in industry and academia. In this research paper, a bodipy-functionalized magnetic fluorescent MSp-TAB hybrid material was developed for detecting mercury(ii) in aqueous media. The magnetic fluorescent MSp-TAB hybrid material was characterized using FT-IR, SEM, EDX, XRD, and TGA. We studied the influence of diverse factors such as contact time, temperature, and pH on the detection of Hg(ii). The fluorometric study demonstrated that the developed magnetic-fluorescent hybrid material was sensitive/selective for Hg(ii) ions in the absence and presence of interfering ions with a limit of detection (LOD) of 2.72 mu M. In conclusion, the developed magnetic fluorescent MSp-TAB hybrid material has demonstrated its applicability and potential for accurate, sensitive, and practical detection of Hg(ii) in tap water samples.
  • Küçük Resim
    Öğe
    Fabrication and characterization of new Fe3O4@SiO2@TiO2-CPTS-HBAP (FST-CH) nanoparticles for photocatalytic degradation and adsorption removal of rhodamine B dye in the aquatic environment
    (Elsevier Ltd., 2024) Çimen, Aysel; Bilgiç, Ali; Bayrak, Melike
    In this study, Fe3O4@SiO2@TiO2-CPTS-HBAP (FST-CH) nanoparticle was prepared for the simultaneous adsorption and photocatalytic degradation of aromatic chemical pollutants (Rhodamine B dye) in aqueous solution. FST-CH nanoparticle was characterized using scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), Energy Dispersive X-Ray (EDX) Fluorescence Spectrometer and X-Ray Diffraction (XRD) spectroscopy. The photocatalytic activity of rhodamine B dye (RhB) was evaluated with a Kerman UV 8/18 vertical roller photoreactor. About 56% of RhB in aqueous medium was adsorbed by FST-CH nanoparticles with only 45 min of stirring in the dark, and about 77.01% was degraded or converted to other structures under the photoreactor for 120 min. The photocatalytic degradation of RhB (apparent rate constant: 0.0026 mg dm−3 min−1) occurred by a pseudo-second order reaction. In addition, the recovery of the prepared magnetic FST-CH nanoparticle by an external magnetic field, exhibiting good magnetic response and reusability, shows that the obtained magnetic FST-CH nanoparticle is stable and maintains high degradation ratio and catalyst recovery even after four cycles. Thus, the prepared FST-CH nanoparticle can be highly recommended for its use in potential applications of water decontamination.
  • Küçük Resim
    Öğe
    Novel optical microcapsule sensor for effective recognition of Hg(Iı) and Ag (I) ions in the aquatic environments
    (Elsevier Sci Ltd, 2025) Bilgiç, Ali; Çimen, Aysel; Bayrak, Melike; Kurşunlu, Ahmed Nuri
    Because conventional methods for the detection of heavy metal ions in water involve expensive equipment and complex procedures, there is a lot of interest in the improvement of simple and quick methods for determining heavy metal ions in water. Use of natural polymers as biosorbents such as sporopollenin for heavy metal removal is advantageous. There is an urgent demand to devise a simple method for the simultaneous detection of metal ions, especially in the case of mercury(II) and silver(I) coexisting among metals. Therefore, in this study, a fluorescent microcapsule sensor (SpT-P[5]-EB), the modified sporopollenin surface based-on a combination of Pillar[5]arene and Bodipy, was developed to detect silver(I) and mercury(II) ions simultaneously or separate with an on-off principle in the aquatic environment. The fluorescent microcapsule, SpT-P[5]-EB, indicated a high sensitivity and excellent selectivity for both silver(I) and mercury(II) ions with detection limits of 1.51 mu M and 0.72 mu M, respectively. The Hg(II) and Ag(I) ions may be detected simultaneously or individually using the SpT-P[5]-EB microcapsule sensor in easy, practical, and affordable procedures.
  • Küçük Resim
    Öğe
  • Küçük Resim
    Öğe
    Synthesis, characterization, and application of novel fluorescent sporopollenin for effective detection of mercury (ıı) ions from aqueous media
    (Elsevier, 2024) Bayrak, Melike; Çimen, Aysel; Bilgiç, Ali
    In this investigation, a novel environmentally friendly functionalized fluorescent Sp-TAB hybrid material was advanced for the sensitive detection of environmentally polluting Hg(II). The characterization of the synthesized fluorescent Sp-TAB hybrid material using SEM and EDX provided insights into morphological and structural changes in the material's pore structure, while XRD and FT-IR analyses revealed the impact of the prepared material at each stage. Optimal parameters such as temperature, contact time, and pH influencing Hg(II) ion detection were determined. Application of the fluorescent Sp-TAB hybrid material was determined a detection limit (LOD) of 4.87 mu M for Hg(II) ions. This study shows the potential of the immobilization-enhanced fluorescent Sp-TAB hybrid material for sensitive Hg(II) ion detection in tap water. Additionally, this study is believed to serve as a model for sensitive and practical detection applications of heavy metals in the future.
  • Küçük Resim
    Öğe
    Ultra-hybrid sensor based on magnetic and fluorescent biomaterial for the sensitive/selective detection of toxic Ag+ and Hg2+ ions in real samples
    (Elsevier Ltd., 2024) Bilgiç, Ali; Çimen, Aysel; Bayrak, Melike; Kurşunlu, Ahmed Nuri
    The development of high-performance, eco-friendly and magnetic sensors prepared from natural products have recently attracted a lot of attention for the selective detection of metal ions in aqueous environments and the simultaneous detection of metals in the same environment. In this study, a fluorescent and magnetic sensor (MSp-P[5]-EN-B) was prepared by the immobilization of Bodipy and pillar [5]arene on the sporopollenin surface modified by Fe3O4 for the selective detection of Ag+ and Hg2+ ions separately and together in the aqueous solution. The characterization of the fluorescent and magnetic sensor, MSp-P[5]-EN-B, was supported by techniques such as SEM, FT-IR, and XRD. The fluorescence data of MSp-P[5]-EN-B sensor was examined with various concentrations in the range 1–100 μM that in here, an “on-off” fluorescence process for Ag+, and Hg2+ and the detection limits are 0.019 μM and 0.33 μM, respectively. As a result, the designed magnetic MSp-P[5]-EN-B sensor showed strong potential in terms of its accurate, sensitive, and practical application in the separate and simultaneous detection of Ag+ and Hg2+ ions in aqueous media.