Resumo

CARRIAZO, José; MOLINA, Rafael  e  MORENO, Sonia. STRUCTURAL AND TEXTURAL CHARACTERIZATION OF A COLOMBIAN BENTONITE . Rev.Colomb.Quim. [online]. 2007, vol.36, n.2, pp.213-225. ISSN 0120-2804.

In the present work a Colombian bentonite (from Valle del Cauca) was characterized by X-ray diffraction, spectroscopic techniques (IR, NMR and EPR) and textural analysis. The results indicate that dioctahedral (aluminian) smectite is the principal component in the natural material. In addition, both 29Si NMR and 27Al NMR analysis reveal the isomorphous substitution of Al3+ by Si4+ in the tetrahedral sheet. The EPR study shows iron (III) in octahedral sheet positions of the clay mineral besides “nanoclusters” probably in oxides or oxyhydroxides form. The textural analysis indicates that the bentonite is predominantly a mesoporous material.

Palavras-chave : natural clay; bentonite; smectite; characterization of clays.

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