Removal of radioactive cesium from solutions by zinc ferrocyanide

摘要

Adsorption of ^(134)Cs from aqueous solution by zinc fcrrocyanide,and the effect of experimental conditions on the adsorption were investigated.Preliminary results showed that zinc ferrocyanide was very efficient as an absorbent.Over 98% of ^(134)Cs could be removed by zinc ferrocyanide of 0.33 g·L^(-1) from ^(134)Cs solution (Co) of 3.2～160.0 kBq·L^(-1),with adsorption capacities (Q) of 9.6～463.0 kBq·g^(-1).The adsorption equilibrium time was within one hour and the suitable pH ranged 1～10.No significant differences on ^(134)Cs adsorption were observed at 0～50℃,or in solutions containing Ca^(2+),Fe^(3+),Mg^(2+),HCO_3^-,CO_3^(2-),Cl and SO_4^(2-),even though they are 1000 times higher than the anions or cations in groundwater.However,the adsorption rates decreased when solutions contained K^+ or Na^+.The adsorption process could be described by Frcundlich and Langmuir adsorption equations.