Layered double hydroxides (LDHs) have proved to be highly effective sorbents for heavy metals and radionuclides. In particular, modification of LDHs with ferrocyanide ions was proposed for the extraction of cesium-137. However, sorption-selective characteristics of modified LDHs in the extraction of cesium radionuclides from model and real solutions of liquid radioactive waste (LRW) still remain unexplored. In this study, Zn-Al-LDH was obtained by direct co-precipitation with subsequent in situ intercalation of ferrocyanide anions into the interlayer space to achieve selectivity to cesium. The adsorption kinetics was studied and the relevant adsorption isotherms were derived; the theoretical maximum sorption capacity was found to be 201 mg/g, while the experimentally obtained value was 197 mg/g. The effect of interfering ions on the adsorption of 137Cs was studied and the partition coefficients Kd(137Cs) were determined to be 4838 and 1763 mL/g for model solutions of low and moderate salinity, respectively, and 3259 mL/g for seawater. The resulting composite material demonstrated high potential for the selective extraction of cesium radionuclides from aqueous solutions of varying salinity.
Rastorguev et al. (Sat,) studied this question.
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