Accession Number : ADA133421

Title :   The Nature and Photochemistry of Organic Molecules Adsorbed on Clays.

Descriptive Note : Final rept.,


Personal Author(s) : Thomas,J. K.

Report Date : 09 SEP 1983

Pagination or Media Count : 15

Abstract : Spectroscopic and pulsed laser techniques have been used to study the nature of the adsorption of solutes on colloidal clays, and the photochemistry that results on excitation of the solutes. It is found that cationic materials are readily bound to colloidal montmorillonite and kolin clays; uncharged molecules are bound if they are polar; organo clays, formed by adsorption of cationic surfactants on clays readily solubilize uncharged non-polar molecules also. Molecules are adsorbed in the clay layers where their local concentrations are high, thus giving rise to increased bimolecular reactivity. Segregated adsorption of organic molecules on clays also promotes reactivity. Traces of iron in the clay causes strong photo-oxidation of adsorbed molecules. Some initial studies of photochemistry in cellulose films are also described.

Descriptors :   *Clay, *Adsorption, *Organic solutes, *Photochemical reactions, Montmorillonite, Kaolinite, Colloids, Cations, Chemisorption, Iron

Subject Categories : Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE