Artigo
Encapsulation of titanium (IV) silsesquioxane into the NH4USY zeolite: Preparation, characterization and application
Fecha
2007-10-02Registro en:
Materials Research Bulletin. Oxford: Pergamon-Elsevier B.V., v. 42, n. 10, p. 1811-1822, 2007.
0025-5408
10.1016/j.materresbull.2006.12.001
WOS:000249644000003
0545046720519536
1509480515046572
0072173018005712
Autor
Universidade Estadual Paulista (Unesp)
Resumen
This work describes the encapsulation of titanium (IV) silsesquioxane into the supercavities of NH4USY ultra stabilized zeolite, after chemical treatment. The modified zeolite was characterized by Fourier transform infrared spectra, Nuclear magnetic resonance, scanning electronic microscopy, X-ray diffraction and thermogravity. This encapsulated titanium (IV) silsesquioxane can adsorb Azure A chloride after treatment with H3PO4, without modifier leaching problems. In an electrochemical study, the cyclic voltammograms of the graphite paste modified electrode, shows two redox couples with formal potential (E-0) -0. 1 V and 0.21 V to I and II redox couples respectively (v = 700 mV s(-1); Britton Robinson buffer (B-R) solution, pH 3) versus SCE ascribed to a monomer and dimmer of azure. This paper shows the use of ultra stabilized zeolite in the electrochemical field as host for molecules with nanometric dimensions. (c) 2006 Elsevier Ltd. All rights reserved.