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Clay Minerals; December 2000; v. 35; no. 5; p. 771-779
© 2000 Mineralogical Society of Great Britain and Ireland
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Research Paper

Structural changes in phenol-intercalated hydrotalcite caused by heating

J. CORNEJO1,*, R. CELIS1, I. PAVLOVIC2, M. A. ULIBARRI2 and M. C. HERMOSÍN1

1 Instituto de Recursos Naturales y Agrobiología de Sevilla, CSIC, Apdo 1052, 41080 Sevilla, Spain, and 2 Facultad de Ciencias, Departamento de Química Inorgánica e Ingeniería Química, Universidad de Córdoba, 14004 Córdoba, Spain

* E-mail: cornejo{at}irnase.csic.es

(Received 23 September 1999; revised 27 March 2000)

Thermal analysis (DTA-TG-DTG), X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, nitrogen adsorption and mercury intrusion porosimetry techniques were used to assess the structural changes induced upon heating of two hydrotalcite-phenol (trichloro- and trinitrophenol, HT-TCP and HT-TNP) complexes, and the results were compared with those obtained for the original hydrotalcite (HT) sample. The DTA revealed thermal effects that depended on the nature of the interlayer ion in the complexes. The total weight loss (TG-DTA) increased from 37% for the original HT to 40% for HT-TCP and 77% HT-TNP, as the amount of phenol increased. The XRD and FTIR spectroscopy showed that the calcination product (550°C) of the HT-phenol complexes was indistinguishable from that formed from the original HT. Since HT-phenol complexes were prepared by phenol adsorption on calcined HT, our results confirm the recyclability of HT-like compounds as sorbents for phenols.

KEYWORDS: Hydrotalcite, interlayered complexes, organic anions, phenols, porosity, specific surface area, thermal analysis






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