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Öğe Adsorption of copper(II), cobalt(II), and iron(III) ions from aqueous solutions on poly(ethylene terephthalate) fibers(John Wiley & Sons Inc, 1998) Yigitoglu, M; Ersoz, M; Coskun, R; Sanli, O; Unal, HIThe adsorption behavior of poly(ethylene terephthalate) (PET) fibers towards copper(II), cobalt(II), and iron(III) ions in aqueous solutions was studied by a batch equilibriation technique. Influence of treatment time, temperature, pH of the solution, and metal ion concentration on the adsorption were investigated. Adsorption values for metal ion intake followed the following order: Co(II) > Cu(II) > Fe(III). One hour of adsorption time was found sufficient to reach adsorption equilibrium for all the ions. The rate of adsorption was found to decrease with the increase in the temperature. Langmuir adsorption isoterm curves were found to be significant for all the ions studied. The heat of adsorption values were calculated as -5, -2.8, and -3.6 kcal/mol for Cu(II), Co(II), and Fe(III) ions, respectively. (C) 1998 John Wiley & Sons, Inc.Öğe Kinetic study of ligand exchange reaction of anions as ligands on DAE-sporopollenin(Academic Press Inc Jnl-Comp Subscriptions, 1996) Ersoz, M; Vural, US; Yigitoglu, M; Sezgin, MThe specific rate coefficients and ligand sorption isotherms of Br and I- as ligands on diaminoethyl-sporopollenin were determined as a function of pH and temperature between 20 and 60 degrees C. The ligand exchange rates were measured just after the rapid mixing of the ligand solution with the resin suspension. The data have also been analyzed to obtain activation parameters Delta G, Delta H, and Delta S for reaction in the corresponding mixture. A single ligand-exchange process was observed; the sorption of ligand increased with decreasing pH and hydrated radius of ligands and increasing temperature. A reaction mechanism which describe the ligand exchange reaction is proposed. (C) 1996 Academic Press, Inc.Öğe Selectivity and kinetics of ligand exchange of anions in a chelate ion exchanger(Gauthier-Villars, 1997) Ersoz, M; Cengeloglu, Y; Gokdemir, N; Lale, MLigand selectivity plots and interdiffusion coefficients are presented for the chloride form of a ligand exchanger chemically derived from sporopollenin. Exchanges of iodide and bromide for chloride as the ligand were determined and found to increase with decreasing pH and ion hydration number, The ligand-exchange rates were measured as a function of pH just after rapid mixing of the ligand solution with the resin suspension at temperatures between 20 and 60 degrees C. The results are interpreted in terms of structure, the diffusivity of the ligands, the rate constant for chelate complex formation, and the hydrated radius of the ligands.Öğe The study of kinetic models for ligand exchange of anions as ligands using ligand-exchange resin(John Wiley & Sons Inc, 1997) Ersoz, M; Yigitoglu, M; Ayar, AA comparative study of kinetic models for ligand exchange of I- --> Cl- and Br- --> Cl- as ligands as a function of pH and concentration using diaminoethyl-sporopollenin (DAE-sporopollenin) resin were investigated during the ligand-exchange reaction of the liquid phase. A batch technique was employed for the study of the kinetics of I and Br/Cl exchange as ligands. Five kinetic models were applied to the experimental data. The rate of ligand exchange was increased with decreasing of the hydrated ionic radius and pH. The curve fitting of the mathematical models and the behavior of the kinetic curves are discussed for direct ligand exchange under the conditions employed. (C) 1997 John Wiley & Sons, Inc.
