Characterization and pillaring of a Turkish bentonite (Resadiye)


TABAK A., AFSIN B., Caglar B. , KOKSAL E.

JOURNAL OF COLLOID AND INTERFACE SCIENCE, cilt.313, ss.5-11, 2007 (SCI İndekslerine Giren Dergi) identifier identifier identifier

  • Cilt numarası: 313 Konu: 1
  • Basım Tarihi: 2007
  • Doi Numarası: 10.1016/j.jcis.2007.02.086
  • Dergi Adı: JOURNAL OF COLLOID AND INTERFACE SCIENCE
  • Sayfa Sayıları: ss.5-11

Özet

The shifts of the Si-O-Si stretching and the Si-O-Al and Si-O-Si bending modes, as well as the free silica peak in the IR spectra and the strengthening of the XRD reflections due to the quartz and alpha-cristobalite components of the Al-pillared bentonites (Wyoming and Resadiye), are ascribed to the formation of new Si-O-Al groups of covalent character. The mass losses in the temperature range 150-700 degrees C correspond to the dehydration and dehydroxylation processes. The total mass losses of the Al-pillared bentonites (Wyoming and Resadiye) are close to each other at an OH/Al ratio of 2.2, but calcination from 400 to 600 degrees C causes the surface area of the latter composite to decrease by 13%. (c) 2007 Elsevier Inc. All rights reserved.