Abstract
The removal of trace caesium (137Cs), trace strontium (89Sr, 90Sr/90Y) and trace cobalt (57Co) from aqueous solution by synthetic sodium and potassium birnessites has been studied by a batch technique. Distribution coefficients were determined as a function of pH in four solutions: water, 0.005 M sodium tetraborate, 0.005 M sodium citrate and 0.0001 M EDTA. Other effects studied were increasing sodium ion, potassium ion and complexing agent concentration. Key synthesis parameters (ageing time, MnO4−/Mn2+ ratio) were tuned in order to maximise trace cobalt sorption efficiencies. The optimised material was tested for the removal of caesium, strontium and cobalt from a nuclear power plant floor drain simulant. A sodium birnessite sample was also screened for the removal of 63Ni, 54Mn, 59Fe, 65Zn and 236Pu radionuclides.
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