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

Materials

Muhammad Imran Khan³  Shahbaz Akhtar³  Shagufta Zafar³  Aqeela Shaheen³  Muhammad Ali Khan¹  Rafael Luque²  Aziz ur Rehman³ 

[1] Fujian Institute of Research on Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China; E-Mail:;Departamento de Universidad de Córdoba, Edificio Marie Curie, Ctra Nnal IV-A, Km396, Córdoba E14014, Spain; E-Mail:;Department of Chemistry, the Islamia University of Bahawalpur, Bahawalpur 63000, Pakistan; E-Mails:

关键词: adsorption;    congo red;    anion exchange membrane;    Kinetics;    thermodynamics;   

DOI  :  10.3390/ma8074147

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.