Equilibrium, kinetic and thermodynamic studies of Na+ adsorption from aqueous solutions on homo-ionized K- and NH4-kaolin
Ali, H., Abou-El-Sherbini, K., El-Gammal, O., Talha, N. (2020). Equilibrium, kinetic and thermodynamic studies of Na+ adsorption from aqueous solutions on homo-ionized K- and NH4-kaolin. EKB Journal Management System, 49(3), 6-14. doi: 10.21608/mjcc.2020.412881
H.S. Ali; K. S. Abou-El-Sherbini; O.A. El-Gammal; N.I. Talha. "Equilibrium, kinetic and thermodynamic studies of Na+ adsorption from aqueous solutions on homo-ionized K- and NH4-kaolin". EKB Journal Management System, 49, 3, 2020, 6-14. doi: 10.21608/mjcc.2020.412881
Ali, H., Abou-El-Sherbini, K., El-Gammal, O., Talha, N. (2020). 'Equilibrium, kinetic and thermodynamic studies of Na+ adsorption from aqueous solutions on homo-ionized K- and NH4-kaolin', EKB Journal Management System, 49(3), pp. 6-14. doi: 10.21608/mjcc.2020.412881
Ali, H., Abou-El-Sherbini, K., El-Gammal, O., Talha, N. Equilibrium, kinetic and thermodynamic studies of Na+ adsorption from aqueous solutions on homo-ionized K- and NH4-kaolin. EKB Journal Management System, 2020; 49(3): 6-14. doi: 10.21608/mjcc.2020.412881

Equilibrium, kinetic and thermodynamic studies of Na+ adsorption from aqueous solutions on homo-ionized K- and NH4-kaolin

Mansoura Journal of Chemistry
Volume 49, Issue 3, August 2020, Pages 6-14    PDF (837.05 K)
Document Type: Original Article
DOI: 10.21608/mjcc.2020.412881
Authors
H.S. Ali1; K. S. Abou-El-Sherbini2; O.A. El-Gammal* 3; N.I. Talha1
1Soils, water and environment research institute, Agriculture Research Centre, Egypt.
2Department of Inorganic Chemistry, National Research Centre, 33 El Bohouth st. (former Eltahrir st.), P.O. 12622, Dokki, Giza, Egypt.
3Department of Chemistry, Faculty of Science, Mansoura University, (2), P.O.Box 70, Mansoura- Egypt
Abstract
Egyptian kaolin clay (UnK) was homo-ionized with K+and NH4+ to obtain K-K and N-K, respectively. The analysis of the molar leaching solutions of KCl, NH4Cl or HCl revealed anoriginal cation exchange capacity of UnK up to 6.08meq per 100 g. The adsorption parameters of Na+ on K-K and N-K were examined in aqueous solutions. The equilibrium adsorption data were evaluatedusing Langmuir, Freundlich adsorption and Dubinin–Radushkevich-Kaganer isotherm models. Freundlich model was the best that described the adsorption process and the maximum capacities (qmax) are found to be enhanced to 75.6 and 17.5 mg g-1, respectively. The experimental data fitted well the pseudo-second-order kinetics model. The thermodynamic parameters such as standard Gibbs free energy (∆Gads), enthalpy (∆Hads) and entropy changes (∆Sads) for the adsorption process were calculated. The negative values of the Gibbs free energy confirm that the adsorption processes are spontaneous and thermodynamically favorable while the negative value of ∆Hads supports the exothermic physicochemisorption of the adsorption process. Both homo-ionized kaolin samples are promising cheap adsorbents for lowering the sodicity of soil while gradually exchanging valuable nutrients for plants
Keywords
Na+; Adsorption equilibrium; Kaolin; Thermodynamics; Kinetics
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