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

Department of Chemistry, the Islamia University of Bahawalpur, Bahawalpur 63000, Pakistan
Fujian Institute of Research on Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China
Departamento de Universidad de Córdoba, Edificio Marie Curie, Ctra Nnal IV-A, Km396, Córdoba E14014, Spain
School of Chemistry and Material Science, University of Science and Technology of China, Hefei 230026, Anhui, China
Author to whom correspondence should be addressed.
Academic Editor: Gerald Murphy
Materials 2015, 8(7), 4147-4161;
Received: 12 May 2015 / Revised: 24 June 2015 / Accepted: 29 June 2015 / Published: 8 July 2015
(This article belongs to the Section Porous Materials)
PDF [2082 KB, uploaded 8 July 2015]


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 (∆G°), enthalpy (∆H°) and entropy (∆S°) were calculated for the adsorption of congo red, indicating an exothermic process. View Full-Text
Keywords: adsorption; congo red; anion exchange membrane; Kinetics; thermodynamics adsorption; congo red; anion exchange membrane; Kinetics; thermodynamics

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Khan, M.I.; Akhtar, S.; Zafar, S.; Shaheen, A.; Khan, M.A.; Luque, R.; Rehman, A.U. Removal of Congo Red from Aqueous Solution by Anion Exchange Membrane (EBTAC): Adsorption Kinetics and Themodynamics. Materials 2015, 8, 4147-4161.

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