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Intercalation of salicylic acid into ZnAl layered double hydroxides by ion-exchange and coprecipitation method

M. SILION (FRUNZA)1, D. HRITCU1, M. I. POPA1,*

Affiliation

  1. Department of Chemical Engineering, Faculty of Chemical Engineering and Environmental Protection, Technical University Iasi, Bd. D. Mangeron 71A, 700050, Iasi, Romania

Abstract

Salicylic acid was intercalated into an inorganic host consisting of ZnAl-layered double hydroxides lamella by ionic exchange and coprecipitation technique. The precursors and the intercalation compounds were examined by X-ray diffraction (XRD), FTIR spectroscopy, differential thermal and thermo gravimetric analysis and scanning electron microscopy (SEM). Powder X-ray diffractograms show that the basal spacing of the ZnAl layered double hydroxide bearing salicylate as the intergallery anion expanded from 8.7 Ǻ in the precursor to 15.4 Ǻ in ZnAl-layered double hydroxide obtained by ionic exchange and to 14.9 Ǻ in ZnAl-layered double hydroxide prepared by coprecipitation direct method, respectively. The − NO 3 peak located at 1385 cm-1 in FTIR spectra of the sample prepared by ion exchange was replaced with peaks characteristic to the intercalated salicylate anion. The thermal stability of the intercalated salicylic acid is significantly enhanced compared with the pure form before intercalation. Using the XRD results combined with a molecular simulation model, a possible representation of the salicylate anion positioning between the lamellar layers has been proposed..

Keywords

Layered double hydroxide, Ion exchange, Coprecipitation, Intercalation, Salicylic Acid.

Submitted at: April 10, 2009
Accepted at: April 28, 2009

Citation

M. SILION (FRUNZA), D. HRITCU, M. I. POPA, Intercalation of salicylic acid into ZnAl layered double hydroxides by ion-exchange and coprecipitation method, Journal of Optoelectronics and Advanced Materials Vol. 11, Iss. 4, pp. 528-534 (2009)