Study of the cationic exchange properties of acid activated bentonite I. Effect of structure variation, ph, and ionic strength on the exchange rates of a series of β-phenylethylamines
✍ Scribed by Earl W. Seugling Jr.; Earl P. Guth
- Publisher
- John Wiley and Sons
- Year
- 1961
- Tongue
- English
- Weight
- 651 KB
- Volume
- 50
- Category
- Article
- ISSN
- 0022-3549
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✦ Synopsis
Acid activated bentonite was prepared. The exchange isotherms of a series of pphenylethylamines were determined. A modified spectrophotometric assay was developed to determine the amount of amine in the presence of irrelevant absorbing substances. The effect of time, particle size of the exchanger, structural variation of the amines, pH, and ionic strength were studied. The extent of exchange and adsorption was estimated. The exchange rate increased with alkylation of the amino group. The position of the hydroxyl group on the amine structure affected the exchange rate. Decreasing the pH led to a decrease in the exchange rate, and incteasing the pH led to an increase in the adsorption rate. The amount of amine exchanged at high concentration decreased with ionic strength. The nature of the electrolyte cation influenced the amount of amine exchanged.
HE CATIONIC exchange activity of acid ac-Ttivated bentonite has been reported in earlier studies. Gorman and Guth (1) investigated the exchange properties of acid activated bentonite with application to the assay of pharmaceuticals. Young and Guth (2) continued this study comparing acid activated American and Italian bentonite. Huber and Guth (3) studied the exchange properties of natural American and Italian bentonite. Although these studies indicated certain qualitative aspects of the exchange properties of these clays, they were not sufficiently conclusive to derive quantitative relationships.