ИСТИНА

Sorption of U(VI) from aqueous solutions of various compositions on layered double hydroxides (LDHs) of Mg and Al, and also on layered double oxides (LDOs) of Mg and Al was studied. Experiments on sorption of UO22+ carbonate complexes from aqueous solution on LDO-Mg-Al showed that [UO2(СО3)3]4– ions are weakly captured by LDH-Mg-Al formed by contact of LDO-Mg-Al with water. It is shown that U(VI) is efficiently sorbed from aqueous 10–3 mol l–1 UO2(NO3)2 solutions on LDH-Mg-Al with CO32– and OH– ions in the interlayer space. After 15-min contact of the solid and liquid phases, Kd of U(VI) exceeds 5∙103 ml g–1. The use of microwave radiation allows not only acceleration of the synthesis of both LDH and LDO, but also preparation of compounds with high kinetic characteristics of the U(VI) sorption. The degree of U(VI) sorption from 10–2 mol l–1 aqueous U(VI) solutions at a sorption time of 4 h and V/m = 50 ml g–1 exceeds 99.0%.