Abstract
ABSTRACT Silica-supported copper, cobalt, nickel and zinc hexacyanoferrate(II) composites were prepared by a modified procedure and sorption of cesium by these materials from neutral and acidic media was studied. Distribution coefficient (Kd) values in the range of 103 to 105 mL/g and capacity values in the range of 1.1 to 2.5 meq/g were obtained in neutral media. A considerable increase in Kd values and capacities was observed for cobalt composites as compared to those for the corresponding unsupported material. High Kd values (104 to 105) were also exhibited in nitric acid media by copper, cobalt and nickel composites but only in the presence of low concentration of hydrazine. The underlying mechanism of the sorption of trace cesium by these composites was found to be true ion exchange. Of all the composites studied, nickel-based materials were found to be most attrition-resistant in agitated test solutions. The behaviour of composites observed in this work is explained from a knowledge of known crystal structure and surface properties of pure compounds.
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