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Controlled release of salycilate from the lamella ZnAl layered double hydroxide nanocomposite

M. FRUNZA1,* , M. I. POPA1, V. HULEA2

Affiliation

  1. Department of Chemical Engineering, Faculty of Chemical Engineering, Technical University Iasi, Bd. D. Mangeron 71A, 700050, Iasi, Romania
  2. Ecole Nationale Superieure de Chimie de Montpellier, 8 rue de l’Ecole Normale 34296 Montpellier Cedex, France

Abstract

This paper reports the kinetic study of the release of salycilate (SAL) in layered double hydroxides. SAL was intercalated into ZnAl-layered double hydroxides lamella as an inorganic host by ion exchange technique. Powder X-ray diffractogram shows that the basal spacing of the ZnAl layered double hydroxide with salicylate as the intergallery anion expanded from 8.7 Ǻ to 15.4 Ǻ. The release of SAL anion from the lamella of an organic-inorganic nanohybrid material, ZnAlLDH_SAL nanocomposite, was found to be floe-rates and pH dependent. The release of SAL from the lamella of hydrotalcites at pH 2.0, 5.5, 8.0 was controlled by first-order kinetics..

Keywords

Layered double hydroxide, Ion exchange, Intercalation, Salicylate, Controlled release.

Submitted at: March 23, 2007
Accepted at: Nov. 16, 2007

Citation

M. FRUNZA, M. I. POPA, V. HULEA, Controlled release of salycilate from the lamella ZnAl layered double hydroxide nanocomposite, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 11, pp. 3376-3378 (2007)