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Title: Ammonium sorption by Gördes clinoptilolite rich mineral specimen
Authors: Cansever Erdoğan, Beyhan
Ülkü, Semra
Keywords: Ammonium
Clinoptilolite rich mineral specimen
Sorption kinetic model
Thermodynamic parameter
Issue Date: Dec-2011
Publisher: Elsevier Ltd.
Source: Cansever Erdoǧan, B., and Ülkü, S. (2011). Ammonium sorption by Gördes clinoptilolite rich mineral specimen. Applied Clay Science, 54(3-4), 217-225. doi:10.1016/j.clay.2011.09.005
Abstract: Experimental and theoretical works were performed for the estimation of the effects of pH, initial concentration, agitation speed, particle size and temperature on the ammonium sorption by local clinoptilolite rich mineral specimen. The kinetic sorption data were analyzed using external mass transfer, intraparticle diffusion, pseudo first and second order kinetic models. Diffusion model results revealed that external film diffusion dominated at the very early stages of sorption process and then it was overcome by intraparticle diffusion. Pseudo-second order kinetic model correlated with the experimental data better than the pseudo first order kinetic model. Sorption isotherm model results indicated that the Langmuir isotherm fitted well to the experimental data. Thermodynamic parameters Gibbs energy change (δG), enthalpy change (δH) and entropy change (δS) were calculated. It was shown that the sorption process was exothermic and spontaneous. The value of the activation energy suggested that ammonium sorption by the clinoptilolite rich mineral specimen is likely due to physical interactions between the sorbent and the sorbate. Analysis of the cation exchange results revealed that ion exchange mechanism was not the only step which was effective in ammonium sorption.
ISSN: 0169-1317
Appears in Collections:Chemical Engineering / Kimya Mühendisliği
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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