Browsing by Author "Baran, Yakup"

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Complexation of Some Pendant Arm Tetraazamacrocyles of Cu(Ii) and Co(Ii): Structural, Thermodynamic and Kinetic Studies
(Amer Chemical Soc, 2009) Baran, Yakup; Ozay, Hava; Aktas, Nahit; Miyamae, Hiroshi; Sahiner, Nurettin
Hydrogel Networks for Metal Nanoparticle Syntheses and Their Applications in Catalysis
(Amer Chemical Soc, 2009) Ozay, Hava; Aktas, Nahit; Baran, Yakup; John, Vijay T.; Sahiner, Nurettin
Magnetic Hydrogel Syntheses and Their Applications in the Environment for the Removal of Toxic Metal Ions
(Amer Chemical Soc, 2009) Ozay, Ozgur; Onder, Alper; Sahan, Tekin; Aktas, Nahit; Baran, Yakup; John, Vijay T.; Sahiner, Nurettin
Removal of Toxic Metal Ions With Magnetic Hydrogels
(Pergamon-elsevier Science Ltd, 2009) Ozay, Ozgur; Ekici, Sema; Baran, Yakup; Aktas, Nahit; Sahiner, Nurettin
Hydrogels, based on 2-acrylamido-2-methyl-1-propansulfonic acid (AMPS) were synthesized via photopolymerization technique and used for the preparation of magnetic responsive composite hydrogels. These composite hydrogels with magnetic properties were further utilized for the removal of toxic metal ions such as Cd(II), Co(II), Fe(II), Pb(II), Ni(II), Cu(II) and Cr(III) from aqueous environments. It was revealed that hydrogel networks with magnetic properties can effectively be utilized in the removal of pollutants. The results verified that magnetic iron particle containing p(AMPS) hydrogel networks provide advantageous over conventional techniques. Langmuir and Freundlich adsorption isotherms were applied for toxic metal removal and both isotherms were fit reasonably well for the metal ion absorptions. (c) 2009 Elsevier Ltd. All rights reserved.
Utilization of Magnetic Hydrogels in the Separation of Toxic Metal Ions From Aqueous Environments
(Elsevier, 2010) Ozay, Ozgur; Ekici, Sema; Baran, Yakup; Kubilay, Senol; Aktas, Nahit; Sahiner, 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.