화학공학소재연구정보센터
KAGAKU KOGAKU RONBUNSHU, Vol.44, No.4, 247-252, 2018
Removal of Iodine from Kelp by Competitive Adsorption
Iodine toxicity from kelp has become a significant concern due to the widespread use of kelp as a raw material for food products. Here, the removal of iodine from kelp by use of an anion exchange resin was examined. Due to its competitive adsorption on the resin, iodine is simultaneously removed from kelp and from the liquid phase according to the competitive adsorption equilibrium between kelp and the resin. With an extraction solvent chosen to prevent loss of kelp mass, the dissolution rate of iodine from kelp into the solvent exhibited a high correlation with the kinetic constant of iodine release from kelp, which was calculated from the leaf thickness-dependent transmission distance. In the adsorption of iodine by the anion exchange resin, a high correlation was also found between the experimental value and that obtained from the competitive adsorption model, and when 0.9 M mannitol was used as the extraction liquid to suppress the loss of kelp mass, the average removal rate of iodine was 95% or higher.