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Abstract

In order to construct a photolytic cell for water based on mixed inorganic colloids, as proposed for this project, the different variables playing a role in such a system were closely investigated. New catalysts and electron acceptors were developed to achieve true catalytic light induced water splitting. It was shown by so called sacrificial reactors that, when clay minerals are used in such systems, steric factor might prevent the reaction to proceed. A judicious choice of the clay mineral to be used is necessary. Efficient clays are in fact those that have a negligible internal surface. The same type of sacrificial reactions permitted the development of electron acceptors embedded in positively charged A1(OH)-x colloids. These acceptors are the hydroxides of Eu, Sm and In. Their physicochemical behavior in the reduction of water is described in detail. It is further shown that the combination of the negatively charged clay colloid, charged with a photosensitizer, and the positively charged acceptor colloid leads to the cyclic photolysis of water by visible light. This photodissociation is often periodic and the system is rapidly poisoned. The origin of the latter phenomena is still to be clarified.

Additional information

Authors: NIJS H, CENTRE DE RECHERCHE SUR LES SOLIDES A ORGANISATION CRISTALLINE IMPARFAITE, ORLEANS (FRANCE);BERGAYA F, CENTRE DE RECHERCHE SUR LES SOLIDES A ORGANISATION CRISTALLINE IMPARFAITE, ORLEANS (FRANCE);CHALLAL D, CENTRE DE RECHERCHE SUR LES SOLIDES A ORGANISATION CRISTALLINE IMPARFAITE, ORLEANS (FRANCE);FRIPIAT J J, CENTRE DE RECHERCHE SUR LES SOLIDES A ORGANISATION CRISTALLINE IMPARFAITE, ORLEANS (FRANCE);VAN DAMME H CENTRE DE RECHERCHE SUR LES SOLIDES A ORGANISATION CRISTALLINE IMPARFAITE, ORLEANS (FRANCE), CENTRE DE RECHERCHE SUR LES SOLIDES A ORGANISATION CRISTALLINE IMPARFAITE, ORLEANS (FRANCE)
Bibliographic Reference: EUR 9134 EN (1984) MF, 37 P., BFR 120, BLOW-UP COPY BFR 185, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
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