Solvent Effect on the Kinetics of the Exchange of Copper Ions on Na–Montmorillonite

✍ Scribed by M.T. Hanna; A.A. Zaghloul; M. El-Batouti; Sh.A. El-Shazly

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 76 KB
• Volume: 176
• Category: Article
• ISSN: 0021-9797
• DOI: 10.1006/jcis.1995.9950

✦ Synopsis

on this clay in two solvent systems, dimethyl sulfoxide and The specific rate coefficients of adsorption of Cu 2/ on Naacetone, which have not been studied before. These two montmorillonite clay in dimethyl sulfoxide (DMSO) and acetone solvents belong to the dipolar aprotic solvent class and are solvents are determined at 20, 30, and 40ЊC. The reaction is endosimilar in their molecular formula, but they differ in their thermic in nature. It was found that the E values range from 3.66 acidic properties and their degree of coordination interac-kJ mol 01 in acetone to 13.54 kJ mol 01 in DMSO, while at 20ЊC, tions and thus can have a pronounced influence on the adthe rate constant k varies from 3.34 (ppm) 10 n per second in DMSO sorption of the copper ions on montmorillonite clay. The to 16.07 (ppm) 10 n per second in acetone. The data have been specific objective of this study is to determine the solvent analyzed to obtain activation parameters DG*, DH*, and DS* effects on the reaction rate and to analyze the thermodynamic for reaction in corresponding mixtures. A reaction mechanism which describes the copper ion exchange reaction is proposed. activation parameters in these two solvent media.