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    An approach for prediction of optimum reaction conditions for laccase-catalyzed bio-transformation of 1-naphthol by response surface methodology (RSM)
    (Elsevier Sci Ltd, 2008) Ceylan, Hasan; Kubilay, Senol; Aktas, Nahit; Şahiner, Nurettin
    Response surface methodology (RSM) was successfully applied to enzymatic bio-transformation of 1-naphthol. The experiments were conducted in a closed system containing acetone and sodium acetate buffer, with laccase enzyme. Laccase enzyme used as catalyst was derived from Trametes versicolor (ATCC 200801). The enzymatic bio-transformation rate of I-naphthol, based oil measurements of initial dissolved oxygen (DO) consumption rate in the closed system, was optimized by the application of RSM. The independent variables, which had been found as the most effective variables on the initial DO consumption rate by screening experiments, were determined as medium temperature, pH and acetone content. A quadratic model was developed through RSM in terms of related independent variables to describe the DO consumption rate as the response. Based on contour plots and variance analysis, optimum operational conditions for maximizing initial DO consumption rate, while keeping acetone content at its minimum value, were 301 K of temperature, pH 6 and acetone content of 7% to obtain 9.17 x 10(-3) mM DO/min for initial oxidation rate. (c) 2007 Published by Elsevier Ltd.
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    Optimization with response surface methodology of toluidine blue biosorption conditions from aqueous solutions by Polyporus squamosus (Huds.) Fr. and Lentinus tigrinus (Bull.) Fr. fungi as biosorbent
    (Amer Chemical Soc, 2016) Alpaslan, Duygu; Ersen, Tuba; Kubilay, Senol; Uzun, Yusuf; Kul, Ali Riza; Aktas, Nahit
    [Anstract Not Available]
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    Removal of As(V), Cr(III) and Cr(VI) from aqueous environment by modifiable hydrogels
    (Amer Chemical Soc, 2013) Alpaslan, Duygu; Ersen, Tugba; Kubilay, Senol; Aktaş, Nahit; Şahiner, Nurettin
    [Anstract Not Available]
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    Öğe
    Utilization of Environmentally Benign Hydrogels and Their Networks as Reactor Media in the Catalytic Reduction of Nitrophenols
    (Taylor & Francis As, 2011) Ozay, Hava; Kubilay, Senol; Aktas, Nahit; Şahiner, Nurettin
    Iron particles were synthesized inside poly(2-acrylamido-2-methyl-1-propansulfonic acid) (p(AMPS)) and used as a catalyst in the reduction of nitro benzene and 4-nitrophenol to aniline and 4-aminophenol, respectively, in acidic medium. It was demonstrated that hydrogel networks can be used effectively as catalysis media in the reduction of some organic toxic materials. The results verified that iron particles containing p(AMPS) hydrogel networks yield faster conversion rates. Additionally, iron nanoparticles containing p(AMPS) hydrogel networks could catalyze the reaction, giving 32% yield without any added cocatalyst, providing self cocatalyst mission.
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    Utilization of magnetic hydrogels in the separation of toxic metal ions from aqueous environments
    (Elsevier, 2010) Özay, Özgür; Ekici, Sema; Baran, Yakup; Kubilay, Senol; Aktas, Nahit; Şahiner, Nurettin
    We report the synthesis of poly(2-acrylamido-2-methyl-1-propansulfonic acid-co-vinylimidazole), p(AMPS-c-VI) hydrogels from various amounts of 2-acrylamido-2-methyl-1-propansulfonic acid (AMPS) and N-vinylimidazole (VI) monomers by photo-polymerization technique. Hydrogel composites with magnetic properties were synthesized in situ by incorporating Fe(II) and Fe(III) ions into p(AMPS-c-VI) hydrogels network and then reducing them with alkaline solution. Hydrogels swellings were performed for both bare and magnetic hydrogels. The selective removal capability of toxic metal ions, Cu(II), Cd(II), Fe(II), and Pb(II) by these hydrogels was studied in aqueous medium. Desorption studies were also performed in weakly acidic media to observe whether these hydrogel composites can be utilized as reusable tool for the toxic metal ion removal. The effects of the gel amount, contact time with metal ions, metal species and metal ion concentrations on absorption phenomena were evaluated. The equilibrium removal process of metal ions by the composite hydrogels complies well with the Langmuir adsorption isotherm model. (C) 2010 Elsevier B.V. All rights reserved.