Copper hexacyanoferrate / Composite silica / Radioactive caesium recovery from liquid effluentsSummary A novel composite material has been prepared for the on-column decontamination of radioactive caesium. It consists of copper hexacyanoferrate retained in an anion-exchange polymeric layer bound to porous silica beads. Scanning electron microscope Images show the formation of a coating on the silica surface. The composition determined with neutron activation analysis corresponds to a copper deficient hexacyanoferrate. The mechanical stability of the support is excellent and the composite material is suitable for the on-column recovery of radioactive caesium from liquid effluents. A high on-column decontamination factor was found (less than 0.02% of initial caesium in the eluate after passing 5,000 column volumes) for several radioactive liquid wastes.
Abstract. The Wet Air Oxidation of four organic complexants was studied. This study focuses on the determination of the main by-products formed and the optimization of the degradation yield in a defined area according to four parameters, which are reaction temperature, initial substrate concentration, reaction time and oxygen partial pressure. This optimization is followed by a classic Doehlert matrix.
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