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Latin American applied research

versión On-line ISSN 1851-8796

Resumen

BILGIN SIMSEK, E; BUYRUKLARDAN KAYA, I.G  y  BEKER, U. Comparison of Cr(VI) adsorption onto polymer-based magnetic hybrid adsorbents by nonlinear isotherm and kinetic models. Lat. Am. appl. res. [online]. 2015, vol.45, n.1, pp. 27-32. ISSN 1851-8796.

In the present study, polyglycidyl methacrylate graft copolymer (PG) and ethylene glycol dimethacrylate based polymers (EG) were synthesized and modified by iron oxides in order to have magnetic form (PG-M and EG-M). Batch hexavalent chromium (Cr(VI)) adsorption experiments were carried out as a function of pH. Adsorption data were applied to Langmuir, Freundlich, Dubinin-Raduskevich, Sips, Toth and Redlich-Peterson isotherm models by utilizing non-linear techniques. The Dubinin-Radushkevich isotherm model was found to be the most suitable one for PG-M sample, while Langmuir model fitted best to the experimental data of EG-M sample. The contact time needed for both adsorbents was relatively short, ranging from 1 to 30 min. Approximately 73% of Cr(VI) was rapidly removed by PG-M within ten minutes; and for EG-M sample, 88% of Cr(VI) was removed at the end of five minutes. The rate of the adsorption is governed by a pseudo-second order rate equation

Palabras llave : Polymer; Magnetic Separation; Cr(VI) Adsorption; Nonlinear Isotherm; Kinetic Model.

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