Resumo

CARRIAZO, J.G.; ENSUNCHO-MUNOZ, A.  e  ALMANZA, O.. Electron paramagnetic resonance (EPR) investigation of TiO₂-delaminated clays. Rev. Mex. Ing. Quím [online]. 2014, vol.13, n.2, pp.473-481. ISSN 1665-2738.

In this paper a set of TiO₂ and Fe/TiO₂ delaminated clays, prepared by different synthesis procedures, was characterized by electron paramagnetic resonance (EPR) spectroscopy. EPR analyses revealed an important shift of the central g-value as consequence of Fe³⁺ insertion (substitution) in the TiO₂ structure by a sensitive and direct method of iron incorporation. A series of additional g-values, symmetrically distributed around the central absorption line, was attributed to some electron trapping sites (defects) remained in the TiO₂ framework. The spectroscopic characterizations carried out in this work contribute to understand the photo-catalytic properties previously observed for these solids.

Palavras-chave : delaminated clay; titanium dioxide; EPR; iron-titanium modified clay; clay mineral.

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