Abstract
At present, the iodine adsorbents used in the post-treatment iodine removal system are silver-loaded zeolites (AgZ and AgX), because silver and iodine have higher reactivity. The main advantages of bismuth over silver in iodine capture include high-cost performance, non-toxicity and high adsorption capacity. In this work, the sol–gel method combined with the colloidal crystal template method was used to introduce the three-dimensional ordered macroporous structure into the bismuth-silica aerogels. The detected adsorption capacity reaches 696 ± 21 mg/g, which is approximately 3-fold higher than that of silver-loaded zeolites. And the adsorption mechanism of iodine by the bismuth-silica aerogels was revealed. It is found that the bismuth-silica aerogels have chemical adsorption and physical adsorption for iodine, and BiI3 is mainly formed by the chemical reaction between Bi and I2.
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