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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 365 (1969), S. 325-329 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: An drei Kieselsäureproben wurde die Kinetik der UO22+-Aufnahme untersucht. Die Austauschreaktionen folgen einer einfachen reversiblen monomolekularen Gleichung. An kolloider Kieselsäure wurden Film- und Teilchendiffusion und an vorher auf 90°C erhitztem Kieselgel sowohl Teilchendiffusion als auch chemisch kontrollierte Austauschreaktion als die Austauschgeschwindigkeit bestimmende Faktoren beobachtet. Behandeln des 90°C-Gels mit heißer verdünnter Salzsäure erhöhte den Silanol-Gehalt und die Porosität.
    Notes: The kinetics of uptake of uranium(VI) ion were studied on three silica samples. The exchange reactions were found to obey the simple unimolecular reversible equation. The rate of exchange, in case of colloidal silica, was governed by both film and particle diffusion mechanisms. Uranyl ions were taken up on the preheated silica samples by a fast uptake process followed by a slow one. The rate of the former process was mainly chemically controlled, while that of the latter one was governed by chemical reaction as well as by particle diffusion. Soaking of a preheated silica sample in hot dilute hydrochloric acid solution was found to increase its silanol group content and its porosity.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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