Person: KAHRAMAN, MEMET VEZİR
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KAHRAMAN
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MEMET VEZİR
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Publication Metadata only Recovery of Au(III) ions by Au(III)-imprinted hydrogel(SPRINGER INTERNATIONAL PUBLISHING AG, 2016) KÖK YETİMOĞLU, ECE; Firlak, Melike; Cubuk, Soner; Yetimoglu, Ece Kok; Kahraman, Memet V.A new Au(III)-imprinted hydrogel (Au(III)-Imp) was prepared by the photopolymerisation of 4-acryloylmorpholine (AcM), 2-hydroxyethyl acrylate (HEA), and poly(ethylene glycol) diacrylate (cross-linking monomer, PEG-DA) in the presence of gold ions. In addition, non-imprinted hydrogel (N-Imp) was similarly prepared without Au(III) ions The Au(III)-Imp hydrogel was characterised by several techniques. To achieve the optimal conditions, effect of pH, time, and initial metal ion concentrations were investigated using a batch system. The pre-concentration factor for Au(III) ions was found to be at least 100. The analytical parameters of the method were determined and the method was also successfully applied to computer circuit board scrap samples. The reusability of the Au(III)-Imp hydrogel was also determined. (C) 2016 Institute of Chemistry, Slovak Academy of SciencesPublication Metadata only Phosphonic acid based polymeric fluorescent sensor for Hg(II) analysis(ELSEVIER SCIENCE SA, 2016) KÖK YETİMOĞLU, ECE; Cubuk, Soner; Firlak, Melike; Tasci, Nese; Yetimoglu, Ece Kok; Kahraman, Memet VezirIn this study, vinyl phosphonic acid based highly selective fluorescent sensor was developed for Hg(II) detection in aqueous solution. The sensor showed preferable fluorescence response to mercury ions. Various experimental parameters, such as pH, response time were investigated. The developed sensor showed satisfactory reversibility, reproducibility and response time. The proposed sensor possesses relatively long short term stability of at least 8 h and a life time of 3 months. Working concentration range of the sensor was found to be 2.5 x 10(-8) mol L-1 to 2.5 x 10(-7) mol L-1 and detection limit for mercury ions was 1.3 x 10(-8) Mol L-1. Additionally, the proposed fluorescence sensor was successfully applied to quantitatively determine the amount of mercury in tap water and satisfactory results were obtained. (C) 2015 Elsevier B.V. All rights reserved.Publication Metadata only A novel polymer based fluorimetric sensor for fast and selective determination of chlorpyrifos(ELSEVIER, 2021) KÖK YETİMOĞLU, ECE; Cubuk, Soner; Yetimoglu, Ece Kok; Caliskan, Aynur; Kahraman, Memet VezirIn this study, a spectrofluorometric method has been developed for the determination of chlorpyrifos. For this purpose, firstly, a polymer based membrane has been prepared for chlorpyrifos determination and parameters such as pH, calibration range, sensitivity, selectivity, sensitivity, response time and reproducibility were systematically investigated following the characterization of the membrane. Chlorpyrifos, an organophosphorus pesticide, can be determined by our sensor using the maximum excitation and emission wave lengths at 376 nm and 422 nm, respectively. The measurements can be completed within 20 s and the method also has a very low detection limit of 4.44 ? 10-10 mol L-1. Moreover, the developed polymeric Chlorpyrifos sensor is also suitable for the analysis of chlorpyrifos in tap water and pollen real samples.Publication Metadata only Photocured thiol-ene based optical fluorescence sensor for determination of gold(III)(ELSEVIER SCIENCE BV, 2014) KÖK YETİMOĞLU, ECE; Cubuk, Soner; Kahraman, Memet Vezir; Yetimoglu, Ece Kok; Kenan, SibelThis study describes the preparation and the characterization of a new thiol-ene based polymeric fluorescence sensor by photo initiated polymerization of trimethylolpropane tris(3-mercaptopropionate), 2-hydroxyethylacrylate, and 2,4,6-triallyloxy-1,3,5-triazine which are used as monomers and also a photo initiator (2,2-dimethoxy-2-phenylacetophenone) for its usage as optical sensor for gold ions. The thiolene based polymeric membrane sensor was characterized by using attenuated total reflectance-fourier transform infrared spectroscopy (ATR-FTIR) and scanning electron microscopy (SEM). The response characteristics of the sensors including dynamic range, pH effect, response time, and the effect of foreign ions were investigated. Fluorescence spectra showed that the excitation/emission maxima of the membrane were at 3791425 nm, respectively (C) 2014 Elsevier B.V. All rights reserved.