Studies of Surface Properties of Disperse Silica and Alumina by Luminescence Measurements and Nitrogen Adsorption

A new method for the determination of the adsorption energy distribution of water molecules on disperse silica and alumina surfaces is presented. This method takes into account interactions between the surface and hydrated uranyl (UO2+2) groups, which are luminescent probes. Changes in the spectrosc...

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Bibliographic Details
Published in:Journal of colloid and interface science 1998-05, Vol.201 (2), p.210-219
Main Authors: Glinka, Yu.D., Jaroniec, C.P., Jaroniec, M.
Format: Article
Language:English
Subjects:
adsorption energy
adsorption energy distribution
alumina surface
Chemistry
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
hydrated uranyl groups
luminescence spectra
nitrogen adsorption
Physical and chemical studies. Granulometry. Electrokinetic phenomena
silica surface
thermogravimetric measurements
UO2+2ions
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Summary:A new method for the determination of the adsorption energy distribution of water molecules on disperse silica and alumina surfaces is presented. This method takes into account interactions between the surface and hydrated uranyl (UO2+2) groups, which are luminescent probes. Changes in the spectroscopic characteristics of uranyl ions, measured under selective laser excitation, have been used to evaluate the adsorption activity of different surface sites. The adsorption energy distributions of water molecules, which coordinate the UO2+2ions in the equatorial plane, were evaluated for disperse inorganic oxides on the basis of luminescence measurements and were compared with the energy distribution curves calculated from nitrogen adsorption at 77.35 K, which is the standard technique for the characterization of porous materials. In addition, high-resolution thermogravimetric measurements were performed to supplement information about surface properties of the materials studied. The differences in the nature of adsorption interactions for nitrogen and water probe molecules are discussed in context of their impact on the shape of the resulting adsorption energy distributions. The low-energy and high-energy parts of these distributions were attributed to the physically and chemically adsorbed water molecules, respectively.
ISSN:0021-9797
1095-7103
DOI:10.1006/jcis.1998.5399