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Structural and acidic properties of taeniolites modified by introduction of Fe(3+) species

Bandosz T.J.

Polish Journal of Chemistry

1998

Vol. 72, nr 7

1202-1214

Hydroxy-iron taeniolites were prepared using solutions with a OH/Fe content of about 1.2 and 2.5. Thermal stability of samples was assessed by calcination at temperatures between 473 to 873 K. Acidic properties of surfaces were evaluated using potentiometric titration. The pK-a distributions revealed peaks characteristic for iron complexes (F3(III)) deposited on the surface of clays. Heat treatment resulted in significant changes in the chemistry of the material and creation of new species. After calcination mesoporosity of materials altered significantly. Results obtained demonstrate that iron species are adsorbed mainly on the external surface of taeniolite. Deposition of iron complexes is responsible for the developed mesopore structure of sorbents.