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    Efficient removal of cationic dyes from aqueous solutions using a modified poly(ethylene terephthalate) fibers adsorbent
    (Taylor and Francis Inc., 2020) Ünlü, Nuri; Günay, Kübra; Arslan, Metin
    A novel adsorbent was synthesized through functionalization of glycidyl methacrylate-g-poly(ethylene terephthalate) (GMA-g-PET) fibers with iminodiacetic acid (IDA) to give IDA-GMA-g-PET fibers. This adsorbent was then exploited for the removal of Malachite Green (MG) and Rhodamine B (RB) dyes. MG has shown faster adsorption kinetics and equilibrium was attained in 15 mins. and 90 mins. for MG and RB, respectively. IDA-GMA-g-PET fibers showed 100% removal efficiency for MG and RB dyes from the solutions having initial concentrations of 300 mg L?1and 200 mg L?1, respectively. Desorption conditions of dyes and reusability of the fibers were also investigated.
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    Investigation of high temperature effects on concrete additive antifreeze
    (Aksaray Üniversitesi, 2018) Bekem Kara, İlknur; Arslan, Metin
    The purpose of this work is to determine the effect of the antifreeze additive on the behavior of the concrete under high temperature. For this purpose, two different types of C20 class concrete were produced with reference and antifreeze additive. Fresh concrete was poured into plate molds, after 14 days standard curing, core samples of Ø5x10 cm dimensions were taken from plaque concrete. On day 90, the core samples were exposed to temperatures of 20, 200, 400, 550 and 700 °C for 3 hours and they cooled by air and water spray. Experiments on water absorption, ultrasound transit speed and compressive strength were carried out on the core samples. Microstructures were analyzed by X-ray diffraction method in concrete specimens applied at temperatures of 20 and 700 °C. As a result, it has been determined that the concrete with antifreeze strain that is least affected by the temperature of 700 °C is cooled water.
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    Removing selenite ions (SeO32?) from aqueous solutions by 4-vinyl pyridine monomer grafted poly(ethylene terephthalate) fibers and an estimation of its adsorption mechanism over pH dependency of the adsorption
    (Springer Science and Business Media Deutschland GmbH, 2023) Arslan, Metin; Yılmaz, Merve Nur; Günay, Kübra; Ünlü, Nuri
    In this research, 4-Vinyl pyridine grafted poly(ethylene terephthalate), (4VP-g-PET), fibers were synthesized using the radical polymerization method and used as a novel adsorbent for removing selenite (SeO32?) ions from aqueous solutions. SEM and FTIR spectroscopy were used to examine the structure of the synthesized fibers. Batch experiments were used to conducted the adsorption research. Parameters affecting the adsorption performance like pH, grafting yield, adsorption time, initial selenite concentration and temperature were investigated. The best removal of selenite ions was attained at pH 6. Interestingly, the fibers displayed significant adsorption potential at higher pHs even in highly alkaline environments. Within 3 h, adsorption equilibrium was established, and kinetically, the adsorption process was found to obey the pseudo-first-order kinetic model. Grafting yield increased the amount of selenium adsorption up to 47 percent. The synthesized fibers’ maximum selenite adsorption ability was found to be 26.91 mg g?1. Thermodynamic parameters ?H0, ?S0 and ?G0 of the adsorption were also calculated. The adsorption reaction was determined to be exothermic. The possible adsorption routes were proposed. The synthetic adsorbent, 4VP-g-PET fibers, may be a promising alternative adsorbent for removing selenite from aqueous media.