Browsing by Author "Yayayürük, O"

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    Lead and copper removal using Kula volcanics from environmental waters
    Yayayürük, O; Yayayürük, AE; Koçak, Ç; Koçak, S
    The ability of Kula volcanics (the youngest volcanic rocks of western Anatolia) to remove Pb(II) and Cu(II) from aqueous solutions has been demonstrated, for the first time, in this study. The optimum parameters viz., pH, contact time and sorbent amount/solution volume ratio were evaluated using batch experiments. Langmuir isotherm model excellently described the sorption process and both of the ions followed pseudo-second-order kinetics. The method was applied to the natural river water samples and it was observed that the sorbent can successfully be used for the removal Pb(II) and Cu(II) ions with acceptable accuracy and precision.
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    Thiol-ended polycaprolactone: Synthesis, preparation and use in Pb(II) and Cd(II) removal from water samples
    Körpinar, B; Yayayürük, AE; Yayayürük, O; Akat, H
    In the present study, thiol-ended polycaprolactone (TPCL) was successfully prepared by ring opening polymerization using 2-3 dimercaptopropanol and caprolactone. The synthesized material was employed as a possible adsorbent for removal of Cd(II) and Pb(II) ions from water samples and the influence of essential parameters (pH of 5.0, adsorbent dosage of 10.0 mg and contact time of 30.0 min) on the adsorption process was studied. Different techniques (BET NMR, FTIR, zeta potential, TGA/DTG) were used to characterize physical and chemical properties of the polymer. Various isotherm and kinetic models were employed to understand plausible mechanisms involved in the adsorption. It is revealed that adsorption process fitted very well with the Langmuir isotherm and pseudo-second-order kinetic models for both of the ions. The adsorption capacity decreased slightly (< 10%), demonstrating the thiol-ended polycaprolactone performance even after four consecutive adsorption-desorption cycles. The spike recovery studies with real water samples yielded recoveries of over 90% which indicated the applicability of the method. As a result, thiol-ended polycaprolactone has been demonstrated to be effective sorbent for the removal of Cd(II) and Pb(II) ions from aqueous solution, indicating its potential relevance in water remediation.