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Type: Artigo de periódico
Title: Adsorption of hidrogen peroxide on the surface of silica - titania mixed oxide obtained by the sol-gel processing method
Author: Gonçalves, J. E.
Filho, U.P. R.
Franco, D.W.
Gushikem, Y.
Abstract: This work describes the sol-gel mixed oxide SiO2/TiO2 property, ST, as prepared, and submitted to heat treatment a 773 K, STC. SEM and EDS images show, within magnification used, a uniform distribution of the TiO2 particles in SiO2/TiO2 matrix. Both, ST and STC adsorb hydrogen peroxide on the surface and through EPR and UV-Vis diffuse reflectance spectra, it was possible to conclude that the species on the surface is the peroxide molecule attached to the Lewis acid site of titanium particle surface, alphaTi(H2O2)+. As the material is very porous, presumably the hydrogen peroxide molecule is confined in the matrix pores on the surface, a reason why the adsorbed species presents an exceptional long lived stability.
Subject: sol-gel
hydrogen peroxide adsorption
porous material
Editor: Fundação Editora da Universidade Estadual Paulista Júlio de Mesquita Filho - UNESP
Rights: aberto
Identifier DOI: 10.1590/S0100-46702007000200007
Date Issue: 1-Jan-2007
Appears in Collections:Unicamp - Artigos e Outros Documentos

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