2.2 Iodine adsorption/desorption experiments and iodine adsorption kinetic
Both iodine adsorption and desorption experiments conductedmainly used the gravimetric method in this study. The I2 capture was conducted under typical fuel reprocessing conditions (348 K and ambient pressure with an I2 vapor pressure of 0.014 atm37). For each measurement, the dried adsorbent was placed in a pre-weighted glass vial. The vial and excess solid iodine were put together in a closed system at 348 K and ambient pressure. The iodine-loaded adsorbent was recovered after different exposure times and allowed to cool in an inert environment, and the mass change was recorded.
The iodine adsorption curve at 348 K was simulated for adsorption kinetics, the adsorption kinetic model was investigated and the adsorption kinetic fitting parameters were calculated.
To examine the iodine retention capacity of adsorbent, the iodine desorption experiments were evaluated. Removed the adsorbent that has adsorbed iodine out of the iodine vapor environment and leaved it open, continued to investigate iodine desorption at 398 K. The iodine-desorbed adsorbent was recovered after different exposure times and allowed to cool in an inert environment, and the mass change was recorded.