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GENÇ, SEVAL

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SEVAL

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    Adsorptive removal of bisphenol A from aqueous solutions using phosphonated levan
    (ELSEVIER, 2019) HACIOSMANOĞLU, GÜL GÜLENAY; Haciosmanoglu, Gul Gulenay; Dogruel, Tugce; Genc, Seval; Oner, Ebru Toksoy; Can, Zehra Semra
    In this study, the potential use of phosphonated Halomonas Levan (PhHL) as a natural and cost effective adsorbent for Bisphenol A (BPA), was systematically investigated via the study of the adsorption equilibrium, kinetics, and reuse potential as well as the interpretation of adsorption mechanism. The effects of pH and temperature on the adsorption were also evaluated. The maximum amount of BPA adsorbed on the unit weight of PhHL was determined as 104.8 (-/+ 5.02) mg/g (at 298 K) and the maximum adsorption capacity was calculated as 126.6 mg/g by Sips model. FTIR and XPS studies were conducted to elucidate the adsorption mechanism. Based on the obtained results OH-pi and CH-pi interactions were found to be effective in the adsorption mechanism. The reuse ability was studied with three cycles of adsorption-desorption, and the results showed that the BPA adsorbed per gram of the PhHL decreased 28.6% after the third cycle. This study has shown that PhHL can be used as an effective adsorbent for the removal of BPA from aqueous solutions. The obtained results may be useful in the development of PhHL based adsorption systems for the removal of EDCs with similar chemical properties to BPA.
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    Efficient removal of methyl orange from aqueous solutions using ulexite
    (ELSEVIER, 2021) HACIOSMANOĞLU, GÜL GÜLENAY; Haciosmanoglu, Gill Gillenay; Genc, Seval; Can, Zehra Semra
    Ulexite, a natural boron mineral was used as an adsorbent for methyl orange (MetO) removal from aqueous solutions. SEM/EDS, IEP, BET, XPS and FTIR analyses were used for the characterization of ulexite. The adsorption characteristics of MetO by ulexite were investigated using batch adsorption experiments with varying contact time, pH, initial dye concentration and temperature. Batch adsorption experiments showed that the equilibrium time was 90 min and the reaction kinetics followed pseudo-first-order model. Equilibrium adsorption data were best fitted by the Liu isotherm and the maximum amount of MetO adsorbed per unit weight of ulexite was 1477.6 mg/g (experimental) at 298 K. The equilibrium experiments were repeated for different temperatures (288, 298 and 308 K) and the obtained data were used to calculate the thermodynamic parameters. Based on the results, the adsorption process was exothermic, spontaneous and thermodynamically favourable under the experimental conditions. The adsorption mechanism was elucidated by SEM/EDS, BET, XPS and FTIR analyses of ulexite before and after MetO adsorption. These results suggested that adsorption mechanism includes pi-p bonding, electrostatic attraction, hydrogen bonding and OH-pi bonding. The reuse experiments demonstrated a 14.17 % reduction in the adsorbed amount of MetO per unit weight of ulexite, after the fifth adsorption-desorption cycle. The obtained results indicate that ulexite is potentially an efficient adsorbent for MetO, especially for high initial concentrations. (c) 2021 Elsevier B.V. All rights reserved.