Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 395, Issue -, Pages 224-229Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2012.11.013
Keywords
EtBr; Kinetics; Thermodynamics parameters; Adsorption; Isotherms
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Funding
- Islamic Azad University, Shahre-Qods Branch
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The studies of kinetics and thermodynamics of adsorption of Ethidium bromide in aqueous solutions on single-walled carbon nanotube (SWCNT) and carboxylate group functionalized single-walled carbon nanotube (SWCNT-COOH) surfaces were by UV-Vis spectroscopy. The adsorption kinetics for SWCNT-COOH and SWCNTs were well described by a intra-particle diffusion model, while Langmuir, Freundlich, Harkins-Jura, and Halsey isotherms described the adsorption isotherms, and the adsorption thermodynamic parameters of equilibrium constant (K-0), standard free energy (Delta G(0)), standard enthalpy (Delta H-0), and standard entropy changes (Delta S-0) were measured. The maximum surface coverage for SWCNTs is 36.10% and for SWCNT-COOH is 38.42%. The values of Delta H-0 and Delta G(0) suggested that the adsorption of EtBr on SWCNT-COOH and SWCNTs was endothermic and spontaneous. The adsorption of EtBr on SWCNT-COOH is more than SWCNTs surfaces. (C) 2012 Elsevier Inc. All rights reserved.
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