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    Magnetic hydrogel syntheses and their applications in the environment for the removal of toxic metal ions
    (Amer Chemical Soc, 2009) Özay, Özgür; Önder, Alper; Şahan, Tekin; Aktaş, Nahit; Baran, Yakup; John, Vijay T.; Şahiner, Nurettin
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    Optimization of removal conditions of copper ions from aqueous solutions by Trametes versicolor
    (Elsevier Sci Ltd, 2010) Şahan, Tekin; Ceylan, Hasan; Şahiner, Nurettin; Aktaş, Nahit
    A multi-step response surface methodology was successfully applied to optimize the biosorption conditions for the maximum removal of Cu(II) ions from aqueous solutions using Trametes versicolor fungi as a biosorbent. In the first step, the most effective medium factors, which are pH, temperature and initial Cu(II) concentration, on biosorption of Cu(II), were determined through Plackett-Burman Design. Then steepest accent followed by central composite design steps were utilized to evaluate the optimum biosorption conditions for the maximum Cu(II) ions removal. Based on the statistic analysis; the optimum conditions were obtained 5.51, 20.13 degrees C and 60.98 mg/L as medium pH, medium temperature and initial Cu(II) concentration, respectively. Finally the analysis of variance (ANOVA) of central composite design showed the proposed quadratic model fitted experimental data very well. (C) 2010 Elsevier Ltd. All rights reserved.
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    Reusable Soft Hydrogels for Gold Recovery from Acidic Environments
    (Taylor & Francis Inc, 2013) Şahiner, Nurettin; Karakoyun, Necdet; Şahan, Tekin; Bütün, Sultan; Aktaş, Nahit
    In this study, poly((N-(hydroxymethyl) acrylamide) co-1-allyl-2-thiourea) hydrogels were synthesized by free radical crosslinking copolymerization of N-(hydroxymethyl) acrylamide monomer with the addition of a co-monomer 1-allyl-2-thiourea, and N, N'-methylenebisacrylamide as the crosslinker. The copolymer, poly((N-(hydroxymethyl) acrylamide) co-1-allyl-2-thiourea), was used as a specific sorbent for the recovery of gold. The characteristics of the hydrogels were examined by elemental analyzer and swelling experiments. The effect of pH on the absorption of gold, and the separation and recovery of gold ions from ore samples were investigated. Measurement of absorbed gold was determined by using F-AAS and GF-AAS.