Abstract
AbstractRadiochemical exchange experiments (using 36C1−) have been conducted on ‘hydrous’ alumina precipitates containing chloride ions. The precipitates have been prepared in two ways: (a) by reacting aluminium chloride and sodium hydroxide under controlled conditions of pH, concentration and flow rate, and (b) by the hydrolysis of aluminium s‐butoxide across a benzene‐water interface, with chloride ions added to the aqueous medium. All precipitates were washed and dried at room temperature and portions of some were heated at a series of temperatures up to 1000°.The radiochemical investigations have revealed that most of the chloride ions held by the precipitates are readily accessible; some of these ions are transferred to the exchange solution and the remainder are available for rapid exchange. Important differences are, however, evident between the two types of precipitate: the fractional surface coverage by the chloride ions, Øc1, calculated from the amount exchanged and the BET surface area, is reasonably constant and close to unity only in the case of the class (a) precipitates. It is suggested that the chloride ions in these samples are present in the form of a well‐defined monolayer, but that the chloride ions held by the class (b) precipitates are probably clustered in the pores of the solid. The Øc1 = 1 relation is maintained with heat treatment of the class (a) precipitates up to at least‐60° and is associated with a relatively low degree of thermal ageing.
Published Version
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