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Removal of Congo Red from Aqueous Solution by Anion Exchange Membrane (EBTAC): Adsorption Kinetics and Themodynamics

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Author
Khan, Muhammad Imran
Akhtar, Shahbaz
Zafar, Shagufta
Shaheen, Aqeela
Khan, Muhammad Ali
Luque, Rafael
Publisher
MDPI
Date
2015
Subject
Adsorption
Congo red
Anion exchange membrane
Kinetics
Thermodynamics
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Abstract
The adsorption behavior of anionic dye congo red (CR) from aqueous solutions using an anion exchange membrane (EBTAC) has been investigated at room temperature. The effect of several factors including contact time, membrane dosage, ionic strength and temperature were studied. Kinetic models, namely pseudo-first-order and pseudo-second-order, liquid film diffusion and Elovich models as well as Bangham and modified freundlich Equations, were employed to evaluate the experimental results. Parameters such as adsorption capacities, rate constant and related correlation coefficients for every model were calculated and discussed. The adsorption of CR on anion exchange membranes followed pseudo-second-order Kinetics. Thermodynamic parameters, namely changes in Gibbs free energy (ΔG°), enthalpy (ΔH°) and entropy (ΔS°) were calculated for the adsorption of congo red, indicating an exothermic process
URI
http://hdl.handle.net/10396/15282
Fuente
Materials 8(7), 4147-4161 (2015)
Versión del Editor
http://dx.doi.org/10.3390/ma8074147
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