The Effect of Chloride and Sulfate Ions on the Adsorption of Cd2 on Clay and Sandy Loam Egyptian SoilsReport as inadecuate




The Effect of Chloride and Sulfate Ions on the Adsorption of Cd2 on Clay and Sandy Loam Egyptian Soils - Download this document for free, or read online. Document in PDF available to download.

The Scientific World Journal - Volume 2014 2014, Article ID 806252, 6 pages -

Research Article

Chemistry Department, Rabigh College of Sciences and Arts, King Abdulaziz University, P.O. Box 344, Rabigh 21911, Saudi Arabia

Department of Chemistry, Faculty of Science, Tanta University, Tanta 31527, Egypt

Biological Sciences Department, Rabigh College of Science and Arts, King Abdulaziz University, P.O. Box 344, Rabigh 21911, Saudi Arabia

Soils and Water Use Department, Agricultural and Biological Division, National Research Centre, 33 Al Behoos Street, P.O. Box 12622, Dokki, Cairo, Egypt

Received 15 January 2014; Accepted 19 March 2014; Published 2 April 2014

Academic Editors: H. Filik, C. Pistos, and M. C. Yebra-Biurrun

Copyright © 2014 Mohamed E. EL-Hefnawy et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Adsorption of Cd

on two types of Egyptian soils: clay alluvial and sandy loam calcareous, was studied. Effect of changing the matrix electrolyte type and concentration was used to mimic the natural soil salts. Kinetics and thermodynamic parameters of the adsorption were calculated at two different electrolyte concentrations: 0.05 N and 0.15 N. The adsorption was described by Langmuir and Freundlich isotherms. Results showed that lower concentration of the NaCl or Na2SO4 electrolytes 0.05 N had higher adsorption capacity. Also, the maximum adsorption of cadmium when using sulfate counter ion is about two to three times higher than that when using chloride 544 μg-g for alluvial soil and 170 μg-g for calcareous soil when using 0.05 N. Using NaCl as matrix electrolyte, Freundlich isotherms showed bi-linear fits that probably mean a two energy level adsorption. This might be explained by either the competition of Cd

with Na

or its complexation with Cl

.





Author: Mohamed E. EL-Hefnawy, Elmetwaly M. Selim, Faiz F. Assaad, and Ali I. Ismail

Source: https://www.hindawi.com/



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