Obtaining Hydrated Antimony Pentoxide for the Sorption of Cesium and Strontium Ions
B. M. Shavinsky, L. M. Levchenko, V. N. Mitkin
Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences
luda@che.nsk.su, luda@che.nsk.su, luda@che.nsk.su
Keywords: hydrated antimony pentoxide, sorption of cesium, strontium, antimony tetroxide
Pages: 663-667
Abstract
Potentialities were studied concerning the obtaining of hydrated antimony pentoxide (HAP) via much simpler methods than the method of SbCl5 hydrolysis described in the literature. A sorption capacity was tested for the HAP obtained with respect to Cs+and Sr2+, whose, radionuclides are of environmental hazard when released into water basins. The oxides obtained were studied by means of powder X-ray diffraction method. It is established that the treatment of Sb powder by 16 M HNO3 solution and the subsequent drying at 150 °C results in obtaining antimony tetroxide rather than pentoxide. Evaporation of antimony solution in nitrohydrochloric acid (aqua regia) and drying at the same temperature results in the formation of HAP, whose composition is close to Sb2O5 · 5H2O. Adding HNO3 to the solutions in the course of evaporation results in decreasing the hydration level. It was revealed that when HNO3/HCl molar ratio in aqua regia is equal to 5 : 1 the HAP composition approaches to Sb2O5 · 3H2O (H3SbO4), whereas with HNO3/HCl = 9 : 1 therein the hydrate composition approaches to Sb2O5 · 2H2O (H4Sb2O7).
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