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An experimental study on the iodine sorption mechanism onto mixed solid alumina cement and calcium compounds was carried out. The solids were prepared by mixing the alumina cement with Ca(OH) 2 and/or CaSO 4 •2H 2 O. Batch experiments were performed for iodine sorption onto the solid and iodine desorption from the solid that was obtained after a sorption experiment. In order to clarify the hydrates in the solids, X-ray diffraction measurement and scanning electron microscopic observation were adopted. The iodine sorption onto the solid proceeded to replace the OH − in 4CaO•Al 2 O 3 •13H 2 O by I − in solution to form the new hydrate, 3CaO•Al 2 O 3 •CaI 2 •12H 2 O. The results of sorption and desorption experiments showed that the iodine sorption proceeded reversibly and was independent of concentration of iodine up to 1×10 −2 mole/dm 3 in solution.

An experimental study on the iodine sorption mechanism onto mixed solid alumina cement and calcium compounds was carried out. The solids were prepared by mixing the alumina cement with Ca(OH) 2 and/or CaSO 4 ·2H 2 O. Batch experiments were performed for iodine sorption onto the solid and iodine desorption from the solid that was obtained after a sorption experiment. In order to clarify the hydrates in the solids, X-ray diffraction measurement and scanning electron microscopic observation were adopted. The iodine sorption onto the solid proceeded to replace the OH − in 4CaO·Al 2 O 3 ·13H 2 O by I − in solution to form the new hydrate, 3CaO·Al 2 O 3 ·CaI 2 ·12H 2 O. The results of sorption and desorption experiments showed that the iodine sorption proceeded reversibly and was independent of concentration of iodine up to 1×10 −2 mole/dm 3 in solution.