Journal
POLYHEDRON
Volume 27, Issue 1, Pages 429-439Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.poly.2007.09.034
Keywords
iron silicate; kinetic studies; solid-state dehydration; ion exchange; radioactive waste
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The synthesis of a new series of impregnated metal oxides with different Fe/Si ratios (0.5, 1 and 2) was obtained by the direct precipitation method. Physico-chemical properties and molecular formula of the obtained products were identified with different analytical techniques, such as chemical stability, XRD, IR, elemental and thermal analyses. Thermal kinetic parameters, such as order (n) and activation energy (E-a), of the solid-state phase transformations of the first dehydration process have been studied for the obtained materials from DTA thermograms. The ion exchange applications and the sorption properties of the materials with some radioactive nuclides have been studied, depending on the Fe/Si molar ratios. These investigations indicated that the ion exchange capacities as well as the selectivities of different materials towards the studied nuclides show the order CO2+ > Cs+ > Na+ at a certain pH. (C) 2007 Elsevier Ltd. All rights reserved.
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