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.