Abstract
Prussian blue analogs (PBA) are widely studied for radioactive cesium decontamination. However, there are fewer works related to their post use storage. Considering the oxidative stabilization of the material after the selective uptake of Cs, the thermogravimetric properties in powder and bead form, with various Cs and other alkali metal ions adsorbed, and various heating rates were studied. TG-DTA taken in dry air condition shows an exothermic decomposition at ~270 °C. This temperature varied with the heating rate, mass, and the proportion of adsorbed ions. The best condition for complete oxidation of Prussian blue (PB) is found to be a gradual oxidative decomposition by heating in the temperature range of 200–220 °C until the total mass is decreased by >35%. After this, the temperature could be safely increased to >300 °C for the complete oxidative decomposition of PB that formed iron oxide and salt of the adsorbed Cs. A pilot scale test conducted using the radioactive Cs adsorbed Prussian blue microbeads (PB-b) confirmed that no Cs was released in the effluent air during the process.
Highlights
Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Abstract: Prussian blue analogs (PBA) are widely studied for radioactive cesium decontamination
When the rate was increased to 10 ◦ C/min and higher, the temperature surge during the exothermic oxidation became distinct and it got uncontrollable at the rate of 40 ◦ C/min
PB being a mixed oxidation state iron compound, the third exothermic peak, which is assigned for the formation of iron oxide, covers the partial or complete oxidation of FeII to FeIII, depending upon the energy scale
Summary
TG-DTA taken in dry air condition shows an exothermic decomposition at ~270 ◦ C This temperature varied with the heating rate, mass, and the proportion of adsorbed ions. PB, different from the common zeolite materials, possesses unique selectivity for the alkali metal ions, especially the Cs-ion [5,6,7,8,9,10]. Due to this structural coincidence, PB could be considered the ultimate Cs-decontaminant. From Ni-analog for Cs in alkaline solutions to Cu-analog for the electrochemical removal of Cs or PB for neutral to acidic solutions, no other material shows high Cs selectivity, faster kinetics, and high capacity like the PBA [8,20,21]
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