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Layered double hydroxides (LDHs) have been considered as one of promising sorbents to treat radioactive iodine contaminated soil. In the study, we investigate the effects of intercalation anions and cationic ratio of LDHs on the sorption of iodine from aqueous. The results from kinetic and isotherm sorption experiments showed that intercalation of organic anions (e.g., SDBS, SDS) and higher Mg:Al ratio (e.g., 4:1) have a benefit for the sorption of iodine. The sorption affinity (L·kg −1 ) of iodine with LDHs followed the order: SDS (604.5) &gt; SDBS (528.2) &gt; Cl −  (514.2) &gt; CO 3 2-  (461.8) &gt; SO 4 2-  (311.4) and 4:1 (2912) &gt; 3:1 (514.2)&gt; 2:1 (281.2). It seems that the intercalation of SDBS and SDS provide additional aromatic structures, which is responsible to the specific binding between aromatic carbon with iodine.

The Sorption of Iodine by Modified Layered Double Hydroxides from Aqueous Solutions: Effects of Intercalation Groups and Cationic Ratio