Adsorption behavior of iodide ion by silver-doped zeolite 4A in LiCl-KCl molten salt

In this study, the porous material zeolite with cage-like structure was modified to prepare silver-doped zeolite 4A (abbreviated as [email protected]) using ion exchange method, with a silver loading of 34.2 wt% and a specific surface area of ​​23.62 m2/g. The adsorption performance of [email protected] for anionic iodine in LiCl-KCl molten salt system was investigated through static adsorption experiments. The modified adsorbents and experimental samples were analyzed by XRD, SEM, ICP-OES and other methods. At 550 °C, compared with the unmodified zeolite 4A, adsorption capacity of 34 mg/g of iodine, the maximum adsorption capacity of [email protected] for iodine ions was up to 160 mg/g. When Cs+ existed in the system, the maximum adsorption capacity of [email protected] for iodide ions was about 64 mg/g; when Cs+ and Sr2+ coexisted, the maximum adsorption capacity of [email protected] for iodide ions decreased to 103 mg/g. [email protected] also showed a certain adsorption capacity for Cs+ and Sr2+. These results indicated that the [email protected] has potential application for the removal of iodide ions and other cations in chloride molten salt.