The effect of the synthesis method on the parameters of pore structure and selectivity of ferrocyanide sorbents based on natural mineralsстатья
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Дата последнего поиска статьи во внешних источниках: 20 ноября 2019 г.
Аннотация:Ferrocyanide sorbents were obtained via thin-layer and surface modification of natural clinoptilolite and marl. The effect of modification method on surface characteristics of these sorbents and their selectivity for cesium was studied. It was shown that the modification resulted in an increase of selectivity of modified ferrocyanide sorbents to cesium as compared with the natural clinoptilolite in presence of Na+, as well as in an increase of cesium distribution coefficients in presence of K+. The nickel–potassium ferrocyanide based on the clinoptilolite showed the highest selectivity for cesium at sodium concentrations of 10−4—2 mol L−1: cesium distribution coefficient was lg Kd = 4.5 ± 0.4 L kg−1 and cesium/sodium separation factor was α(Cs/Na) = 250. In the presence of NH4 +, all modified sorbents showed approximately equal selectivity for 137Cs. Probable applications of the sorbents were suggested