Yazar "Yalcin, M. Serkan" seçeneğine göre listele

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    Comparison of Cd(II) preconcentrations by using magnetized Pleurotus erygnii and Coprinus micaceus and its determination in real samples
    (Elsevier Science Bv, 2019) Ozdemir, Sadin; Yalcin, M. Serkan; Kilinc, Ersin; Soylak, Mustafa
    The utilization of the magnetized Pleurotus erygnii and Coprinus micaceus with gamma-Fe2O3 nanoparticles as biosorbents for magnetic solid phase extraction (MSPE) of Cd(II) were investigated in details. The surface structures of magnetized P. erygnii and C. micaceus were investigated by the Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscope (SEM) and energy dispersive X-ray (EDX). The best process conditions were tested and determined as pH 5, 3 mL min(-1) flow rate, 100 mg of P. erygnii and C. micaceus on 75 mg of gamma-Fe2O3 nanoparticles, 5 mL of 1 mol L-1 HCl as eluent, and 400 mL of sample volume for both biosorbents. The limit of detections (LOD) were achieved as 0.054 ng mL(-1) and 0.040 ng(-1) for magnetized P. erygnii and C. micaceus, respectively. Preconcentration factors were determined as 80 for both magnetized biosorbents. The recommended methods were validated using certificated reference materials. Cd(II) in different real samples were determined by ICP-OES (inductively coupled plasma optical emission spectrometry) after preconcentration with developed methods.
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    A magnetized fungal solid-phase extractor for the preconcentrations of uranium(VI) and thorium(IV) before their quantitation by ICP-OES
    (Springer Wien, 2019) Kilinc, Ersin; Ozdemir, Sadin; Yalcin, M. Serkan; Soylak, Mustafa
    The fungus Bovista plumbea immobilized on -Fe2O3 nanoparticles is shown to be a novel sorbent for magnetic solid-phase extractions of U(VI) and Th(IV). The biosorbent was characterized by FT-IR, SEM, and EDX. The effects of pH value, flow rate and volumeof sample, amounts of biomass and support material, eluent type, foreign ions and repeated use of the sorbent on extraction efficiency were investigated. The sorption capacities are 41 and 44mgg(-1), respectively, for U(VI) and Th(IV). The results indicated that B. plumbea immobilized onto -Fe2O3 nanoparticles can be utilized as a novel material for the preconcentrations of U(VI) and Th(IV) in certified materials and in spiked tap, river and lake waters.
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    A new method for the preconcentrations of U(VI) and Th(IV) by magnetized thermophilic bacteria as a novel biosorbent
    (Springer Heidelberg, 2021) Kilinc, Ersin; Ozdemir, Sadin; Yalcin, M. Serkan; Soylak, Mustafa
    This paper proposes the use of Anoxybacillus flavithermus SO-15 immobilized on iron oxide nanoparticles (NPs) as a novel magnetized biosorbent for the preconcentrations of uranium (U) and thorium (Th). The SPE procedure was based on biosorption of U(VI) and Th(IV) on a column of iron oxide NPs loaded with dead and dried thermophilic bacterial biomass prior to U(VI) and Th(IV) measurements by ICP-OES. The biosorbent characteristicswere explored using FT-IR, SEM, and EDX. Significant operational factors such as solution pH, volume and flow rate of the sample solution, amounts of dead bacteria and iron oxide nanoparticles, matrix interference effect, eluent type, and repeating use of the biosorbent on process yield were studied. The biosorption capacities were found as 62.7 and 56.4 mg g(-1) for U(VI) and Th(IV), respectively. The novel extraction process has been successfullyapplied to the tap, river, and lake water samples for preconcentrations of U(VI) and Th(IV).
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    Phallus impudicus loaded with ?-Fe2O3 as solid phase bioextractor for the preconcentrations of Zn(II) and Cr(III) from water and food samples
    (Elsevier Sci Ltd, 2020) Yalcin, M. Serkan; Kilinc, Ersin; Ozdemir, Sadin; Yuksel, Uyan; Soylak, Mustafa
    We investigated the application of fungus Phallus impudicus loaded gamma-Fe2O3 nanoparticles as a biosorbent for magnetic solid phase extractions of trace levels of Zn(II) and Cr(III) ions from natural samples before their measurements by inductively coupled plasma optical emission spectrometry. The characterization of magnetized P. impudicus was performed using the scanning electron microscope, the energy dispersive X-ray and Fourier transform infrared spectroscopy. Important experimental factors were investigated. The experimental results fitted well to the Langmuir adsorption model and pseudo-second order kinetic model. Limit of detections of targeted ions by magnetic solid phase extraction method based on use of P. impudicus were found as 10.5 ngL(-1) and 12.6 ngL(-1) respectively for Cr(III) and Zn(II). The sorption capacities of the biosorbent were 22.8 mgg(-1) for Cr(III) and 25.6 mgg(-1) for Zn(II). The preconcentration factors were achieved as 100 for both of ions. RSDs for inter- and intraday precisions were found as lower than 2.0% and 2.1% respectively for both of targeted ions. The accuracy of the recommended process was tested by recovery measurements on the certificated reference materials and successfully applied for quantification recoveries of Cr(III) and Zn(II) ions from water and food samples.
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    Preconcentrations of Ni(II) and Pb(II) from water and food samples by solid-phase extraction using Pleurotus ostreatus immobilized iron oxide nanoparticles
    (Elsevier Sci Ltd, 2021) Ozdemir, Sadin; Yalcin, M. Serkan; Kilinc, Ersin
    The present study explores the biosorption potential of Pleurotus ostreatus immobilized magnetic iron oxide nanoparticles for solid-phase extractions of Ni(II) and Pb(II) ions from the water and food samples. It was characterized using FTIR, FE-SEM/EDX before and after analyte ions biosorption. Important operational parameters including the effect of initial pH, the flow rate of the sample solution and volume, amount of biomass and support material, interfering ions, best eluent, column reusability were studied. The biosorption capacities of fungus immobilized iron oxide nanoparticles were found as 28.6 and 32.1 mg g(-1) for Ni(II) and Pb(II), respectively. The limit of detection (LOD) and limit of quantitation (LOQ) were achieved as 0.019 and 0.062 ng mL(-1) for Ni(II), 0.041 and 0.14 ng mL(-1) for Pb(II), respectively. The proposed method was validated by applying to certified reference materials and successfully applied for the preconcentrations of Ni(II) and Pb(II) ions from water and food samples by ICP-OES.