To find out the materials having a high adsorption capacity for iodide anion, the adsorption characteristics of iodide on minerals, rock and oxide compounds were investigated and compared by batch experiments. Pyrite, magnesium oxide and calcined Mg/Al LDH are found as good adsorbents for iodide from literature survey and preliminary experiments. When the amount of pyrite or magnesium oxide was constant, the adsorbed amount was increased with initial iodide concen-tration. The adsorption characteristics of iodide on pyrite or magnesium oxide is represented by Freundlich adsorption iso-therm. The adsorption experiments on calcined Mg/Al LDH were performed under the conditions excluding carbon dioxide. The adsorbed amount of iodide on the calcined LDH was higher than that on pyrite or magnesium oxide. The adsorption char-acteristics of iodide on the calcined LDH is described by Langmuir adsorption isotherm. The maximum adsorbed amount of iodide on the calcined LDH and K(ads) of adsorption reaction, resulted from adsorption isotherm, are 3.8 x 10(-3) mol/g and 7.1 x 10(3), respectively. The adsorption of iodide on the calcined LDH is caused by the reconstruction reaction of the calcined LDH and this reaction includes a two-step ion-exchange process. The influence of carbonate anions of the aqueous solution in the adsorption of iodide on pyrite, magnesium oxide and calcined Mg/Al LDH was also investigated. The adsorbed percent of iodide on pyrite or magnesium oxide in the presence of HCO3(-) is similar to that in the absence of HCO3(-) . However, the adsorbed percent of iodide on the calcined LDH decreased sharply with the concentration of HCO(-).