Table of Contents
Journal of Applied Chemistry
Volume 2013, Article ID 789410, 9 pages
http://dx.doi.org/10.1155/2013/789410
Research Article

Contribution of Ion-Exchange and Non-Ion-Exchange Reactions to Sorption of Ammonium Ions by Natural and Activated Aluminosilicate Sorbent

1Voronezh State Academy of Forestry and Technologies, 8 Timiryazeva Street, Voronezh 394087, Russia
2Voronezh State University, 1 Universitetskaja Pl., Voronezh 394006, Russia

Received 30 March 2013; Revised 23 September 2013; Accepted 11 October 2013

Academic Editor: Eno E. Ebenso

Copyright © 2013 Larisa Belchinskaya 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

The effect of acid and alkaline activation of complex natural aluminosilicate sorbent on its chemical composition, surface properties, and adsorption capacity towards ammonium ions was studied. An increase in specific surface area of the sorbent by 1.3 times after acid treatment and by 1.5 times after alkaline activation was shown. The change of ion-exchange complex of sorbent as a result of activation was observed. Sorption isotherms of ammonium ions on natural and activated samples were obtained and were satisfactorily described by the Langmuir equation. The evaluation and comparison of desorbed cations of alkali and alkaline earth metals were carried out. It was confirmed that ion-exchange processes primarily contributed to sorption of ammonium ions by natural and acid-activated silica-alumina, in contrast to alkali-activated one, for which absorption of nonexchangeable ammonium ions increased adsorption capacity of ammonium ions by 1.5 times.