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The Effect of Thermal and Mechanical Treatments on Kaolinite: Characterization by XPS and IEP Measurements by R.M Torres Sánchez; E.I Basaldella; J.F Marco is a Chemistry article available to read on EtoBox.

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The surface transformations induced on kaolinite by different thermal and mechanical treatments have been investigated by means of X-ray photoelectron spectroscopy (XPS), Bremsstrahlung induced Auger spectroscopy, and isoelectric point (IEP) measurements. Heating the kaolinite at temperatures between 500 and 750°C results in the change of a substantial fraction of surface Al from octahedral to tetrahedral coordination, which we associate with the dehydroxylation of kaolinite. Heating at 900 and 980°C brings about the development of an octahedral Al fraction which is associated with the formation of ␥-Al 2 O 3 . The development of an Al tetrahedral component in the Al KLL spectra of the mechanically treated (ground) samples has been also observed. The Si/Al atomic ratio obtained by XPS in the thermally treated samples is the same as that shown by the original kaolinite. However, the XPS data show a clear reduction of the Si/Al atomic ratio in the mechanically treated samples, which suggests that the mechanical treatment has induced an Al enrichment of the kaolinite surface. The IEP values indicated a thermal transformation to metakaolinite and mullite with the increase of temperatur

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Author

R.M Torres Sánchez; E.I Basaldella; J.F Marco

Publisher

Elsevier Science; Elsevier ; Elsevier Inc.; Elsevier BV (ISSN 0021-9797)

Published

1999

Language

EN

Field

Chemistry (Physical Sciences)